" The plot of the second episode of the second season is based on the fact that a girl wakes up in an unfamiliar house and remembers absolutely nothing. She goes out into the street, and every person she meets films her with a smartphone camera. Naturally, she practically goes crazy, not understanding what kind of society this is, in which all people look at the world through a phone screen. Be sure to watch the series, it's worth it.

Meerkat and Periscope are two apps that can lead us to such a world. With their help, you can broadcast your life using a smartphone, and viewers around the world will watch you. It sounds incredibly cool and damn scary at the same time.

Meerkat came out a few months before Periscope, but the good thing about Periscope is that the company that owns it is Twitter. We compared two applications and decided which one is cooler.

Meerkat

Since Meerkat appeared earlier, we'll start with it. To use the application, registration is required, and this can only be done using a Twitter account. When you enter the application, you will immediately be prompted to create a broadcast, naming it so that viewers understand what you are going to show. You can start immediately or schedule it for a specific time.

During the broadcast, you can turn on the front or rear camera, flash, and also open a chat in which viewers and you will communicate.

The broadcast can be ended at any time and is also live on Twitter. Your subscribers will receive notifications the moment you start. Meerkat has a leaderboard that shows a list of people with the most views and viewers. I didn’t find any particular use in it; from here you can only go to the user’s Twitter account.

Broadcasts in Meerkat can be viewed from iOS devices and from a browser, but created only from iOS. There is an unofficial application for Android, but you can only view current broadcasts in it.

Periscope

Periscope has a stronger social component. When creating an account, by the way, also only through Twitter, you will be offered to subscribe to popular users, as well as those whom you follow on Twitter.

And now to the coolest part. If you use Meerkat and don't have a large number of followers on Twitter, you can't even hope for viewers - there won't be any. On Periscope, they begin to pour in, in large quantities and from all over the world.

Having started the broadcast, I watched 25 viewers within a few minutes, and slight hysterics began from the comments at the beginning of the broadcast.

Periscope, like Meerkat, is only available in the iOS version, but you can also view broadcasts from a browser. An Android app is promised soon.

I don't see the point of using Meerkat, given that there will be a lot more people watching your broadcasts on Periscope. Most likely, the power of Twitter will soon make Periscope the only such service.

Try it and tell me how you like it. Both Meerkat and Periscope are completely free.

Periscope- a program that allows you to conveniently conduct online broadcasts in real time via the Internet. Users can view private and public broadcasts, and can like and comment on videos. You will also be able to conduct such video broadcasts yourself and communicate with the audience.

Periscope has grown a lot and installation statistics show this this application over 70,000,000 users have already installed and are using the application. The quality of performance is excellent, the video is transmitted perfectly and without delays. Even if you have weak internet. Social network Periscope will allow you to broadcast your video and communicate with viewers in live. You can also subscribe to people you are interested in and watch their lives and watch their broadcasts in real time (or you can watch a recorded video). With Periscope you can spy on the whole world, because video broadcasts take place all over the globe, and you can see what a French girl is doing, how the guys live in Canada, you will see real mountains, you can hear the sound of the ocean and much more.

The interface consists of three tabs: the first one displays ongoing broadcasts; The 2nd shows a map with video broadcasts; The 3rd displays a list of recommendations and most popular videos. Today Periscope has no analogues, so it is certainly the leader in the market.

Key features of Periscope on Android:

• on-line translation;
• broadcast video taken from your phone;
• watching other people's broadcasts;
• map mode, which shows in which places the broadcasts are carried out;
• leave comments on the broadcast video;
• people broadcast their videos from different parts of the planet;
• Twitter integration (share video broadcasts to other social networks);
• high-quality implementation of notifications;
• delayed viewing function after the end of the broadcast (available throughout the day);
• tracking likes;
• look best moments missed broadcasts;
• the ability to block unwanted individuals;
• subscription;
• video broadcast replay;
• ability to set the mode: for everyone and selected;
• news feed displays past and current broadcasts.

Periscope has become a non-standard service for phones that provides video broadcasting. If you want to start using the program, you need to install it on your smartphone, and then, if you have Internet access, you can start broadcasting online.

Download Periscope for Android free, without registration and SMS from our website, using the direct link below.

True fans of online broadcasts know that there are applications similar to Periscope. Some of them were launched before the brainchild of Twitter. The most popular among these programs are those that will be discussed below.

7 facts about Meerkat

Twitch vs Periscope

Despite the general implementation in the field of video streaming, Twitch and Periscope are quite different from each other. The main differences are observed in the following categories:

What is Projector TV?

Install this analogue of Periscope access to streams and broadcasting is possible only within the operating room iOS systems, and versions from the eighth and higher are supported. Unfortunately, the Russian analogue of Periscope on Android is not yet available and the developer has not yet advertised the implementation of such a version.

In addition, for smartphones that are locked in any country, installation of the program is prohibited.

An obvious advantage of the Periscope analogue on Russian market– the ability to post a broadcast on the VKontakte wall, and views on this social network are taken into account when compiling the overall popularity rating.

In general, we can say that programs similar to Periscope today cannot be called full-fledged analogues. They are either sold only for owners of apple products, or are tailored for completely different purposes. However, the video broadcast market is just beginning to develop, and perhaps soon there will be worthy competitors among Russian analogues of Periscope.

" The plot of the second episode of the second season is based on the fact that a girl wakes up in an unfamiliar house and remembers absolutely nothing. She goes out into the street, and every person she meets films her with a smartphone camera. Naturally, she practically goes crazy, not understanding what kind of society this is, in which all people look at the world through a phone screen. Be sure to watch the series, it's worth it.

Meerkat and Periscope are two apps that can lead us to such a world. With their help, you can broadcast your life using a smartphone, and viewers around the world will watch you. It sounds incredibly cool and damn scary at the same time.

Meerkat came out a few months before Periscope, but the good thing about Periscope is that the company that owns it is Twitter. We compared two applications and decided which one is cooler.

Meerkat

Since Meerkat appeared earlier, we'll start with it. To use the application, registration is required, and this can only be done using a Twitter account. When you enter the application, you will immediately be prompted to create a broadcast, naming it so that viewers understand what you are going to show. You can start immediately or schedule it for a specific time.

During the broadcast, you can turn on the front or rear camera, flash, and also open a chat in which viewers and you can communicate.

The broadcast can be ended at any time and is also live on Twitter. Your subscribers will receive notifications the moment you start. Meerkat has a leaderboard that shows a list of people with the most views and viewers. I didn’t find any particular use in it; from here you can only go to the user’s Twitter account.

Broadcasts in Meerkat can be viewed from iOS devices and from a browser, but created only from iOS. There is an unofficial application for Android, but you can only view current broadcasts in it.

Periscope

Periscope has a stronger social component. When creating an account, by the way, also only through Twitter, you will be offered to subscribe to popular users, as well as those whom you follow on Twitter.

And now to the coolest part. If you use Meerkat and don't have a large number of followers on Twitter, you can't even hope for viewers - there won't be any. On Periscope, they begin to pour in, in large quantities and from all over the world.

Having started the broadcast, I watched 25 viewers within a few minutes, and slight hysterics began from the comments at the beginning of the broadcast.

Periscope, like Meerkat, is only available in the iOS version, but you can also view broadcasts from a browser. An Android app is promised soon.

I don't see the point of using Meerkat, given that there will be a lot more people watching your broadcasts on Periscope. Most likely, the power of Twitter will soon make Periscope the only such service.

Try it and tell me how you like it. Both Meerkat and Periscope are completely free.

PERISCOPE, an optical device that makes it possible to examine objects located in horizontal planes that do not coincide with the horizontal plane of the observer’s eye. It is used on submarines for observing the surface of the sea when the boat is submerged, in the ground army - for safe and inconspicuous observation of the enemy from protected points, in technology - for examining inaccessible internal parts of products. In its simplest form, a periscope consists of a vertical pipe (Fig. 1) with two mirrors S 1 and S 2 inclined at an angle of 45° or prisms with total internal reflection, located parallel to each other at different ends of the pipe and facing each other with their reflective surfaces . However, the periscope reflective system can be designed in different ways. A system of two parallel mirrors (Fig. 2a) gives a direct image, the right and left sides of which are identical to the corresponding sides of the observed object.

A system of two perpendicular mirrors (Fig. 2b) gives a reverse image, and since it is viewed by an observer standing with his back to the object, the right and left sides change their places. Inverting the image and shifting the sides is easy to achieve by placing a refractive prism in the system, but the need to observe with your back to the object, and therefore difficulty in orientation, remains, and therefore the second system is less suitable. The disadvantages of the periscope shown in Fig. 1 and used in trench warfare, are a small angle of view α (about 10-12°) and a small aperture ratio, which forces us to limit ourselves to a length of no more than 1000 mm with a relatively large pipe diameter - up to 330 mm. Therefore, in a periscope, the reflective system is usually associated with a lens system. This is achieved by attaching one or two telescopes to the reflective system of the periscope. Moreover, since a conventional astronomical tube gives a reverse image with displaced sides, the combination of perpendicular mirrors with such a tube will give a direct image with correctly positioned sides. The disadvantage of such a system is the position of the observer with his back to the subject, as mentioned above.

Attaching an astronomical tube to a system of parallel mirrors is also impractical, since the image will turn out upside down, with the sides facing away. Therefore, a periscope usually combines a system of parallel mirrors and an earthly telescope, which gives a direct image. However, installing two astronomical tubes after two inversions will also give a direct image, which is why it is also used in a periscope. In this case, the pipes are positioned with lenses facing each other. The refractive system of a periscope does not present any special features in comparison with a telescope, however, the choice of one or another combination of telescopes (or rather lenses), their number and focal length is determined by the required angle of view and aperture ratio of the periscope. In the best periscopes, image brightness is reduced by ≈30%, depending on the system and type of lens.

Since the clarity of the image also depends on the color of objects, improved visibility is also achieved by using color filters. In the simplest form of a periscope (Fig. 3), the upper lens O 1 gives a real image of the object at point B 1, refracting the rays reflected by the prism P 1. The collecting lens U also creates at point B 2 a real image of the object, which is reflected by the prism P 2 and viewed through the eyepiece O 2 by the eye of the observer. Tubes typically use achromatic lenses and take steps to eliminate other aberration distortions. By installing two telescopes one after the other, operating similarly to the one described above, it is possible to increase the distance between the prisms without compromising the aperture of the periscope and its field of view. The simplest periscope of this type is shown in Fig. 4. Already the first periscopes of this type provided a field of view of 45° and a magnification of 1.6 with an optical length of 5 m and a pipe diameter of 150 mm.

Because observation with one eye is tiring, periscopes were proposed that provide an image on frosted glass, but this image significantly lost in clarity, and therefore the use of frosted glass in periscopes did not become widespread.

The next stage in the development of the idea of ​​periscopes was attempts to eliminate the need to rotate the periscope tube when viewing the horizon 360°. This was achieved by connecting several (up to 8) periscopes on one pipe; the corresponding part of the horizon was examined through each of the eyepieces, and the observer had to walk around the pipe. This kind of multiplier periscopes did not give the whole picture as a whole, and therefore omniscopes were proposed that give the entire horizon in the form of a ring picture by replacing the lens with a spherical refractive surface. This kind of devices, being characterized by considerable complexity, did not provide an increase in the vertical field of view, which interfered with the observation of aircraft, and distorted the image, and therefore fell out of use. More successful was the strengthening optical system in the inner pipe, which could rotate inside the outer one independently of the latter (Fig. 5).

This kind of panoramic periscope, or kleptoscope, requires some additional optical device. The light beam, penetrating the periscope head through the ball glass cover H, which protects the device from water and does not play an optical role, spreads through the optical system P 1, B 1, B 2, etc., which is fixed in the inner tube J. The latter rotates using a cylindrical gear train, shown at the bottom of the device by handle G, regardless of the outer casing M. In this case, the image falling on the lens B 3, refracted by the prism P 2 and viewed by the eyepiece, will rotate around the light axis of the eyepiece. To avoid this, a quadrangular prism D is fixed inside the inner tube, rotating about a vertical axis using planetary gears K 1, K 2, K 3 at half speed and straightening the image.

The optical essence of the device is clear from Fig. 6, showing how rotating the prism rotates the image at twice the speed. An increase in the field of view in the vertical direction from 30° in a conventional periscope to 90° is achieved in an zenith periscope by installing a prism in the objective part of the device, rotating about a horizontal axis, regardless of the rotation of the entire upper part about a vertical axis to view the horizon. The optical part of a periscope of this type is shown in Fig. 7.

Periscopes are used on submarines for two purposes: observation and control of torpedo fire. Observation may consist of simple orientation in the environment and a more careful examination of individual objects. For observation, objects should be visible in life size. At the same time, it has been practically established that for accurate reproduction with monocular observation of objects that are usually observed binocularly with the naked eye, the magnification of the device must be increased. more than 1.

Currently, all submarine periscopes have a magnification of 1.35-1.50 for easy orientation. For a thorough examination of individual objects, magnification should be used. more, with the maximum possible illumination. Currently, an increase of X 6 is used. Thus. Periscopes have a double requirement regarding the magnification of the device. This requirement is satisfied in bifocal periscopes, the optical part of the lens of which is shown in Fig. 8.

Changing the magnification is achieved by rotating the system 180°, while the lens O 1 and lens K 1 do not move. For greater magnification, use the system V' 1, P" 2, V' 2; for smaller magnification, use the system V 1, P 1, V 2. Appearance The lower part of the anti-aircraft bifocal periscope is shown in Fig. 9.

The described design for changing magnification is not the only one. More simply, the same goal is achieved by removing excess lenses from the optical axis of the device, mounted in a frame that can be rotated around the axis at will. The latter is designed vertically or horizontally. To find direction of objects, determine their distance, course, speed and to control torpedo firing, periscopes are equipped with special devices. In fig. 10 and 11 show the bottom of the periscope and the observed field of view for a periscope equipped with a vertical base rangefinder.

In fig. Figure 12 shows the field of view of the periscope for determining the distance and heading angle using the alignment principle.

In fig. 13 shows the lower part of a periscope equipped with a photographic camera, and FIG. 14 - lower part of the periscope with a device for controlling torpedo firing.

When the periscope head moves, it causes waves on the surface of the sea, which make it possible to establish the presence of a submarine. To reduce visibility, the head of the periscope is made as small in diameter as possible, which reduces the aperture of the periscope and requires overcoming significant optical difficulties. Usually, only the upper part of the pipe is made narrow, gradually widening it downwards. The best modern periscopes, with a tube length of more than 10 m and a diameter of 180 mm, have an upper part about 1 m long with a diameter of only 45 mm. However, experience has now established that the discovery of a submarine is achieved not by detecting the periscope head itself, but by the visibility of its trace on the surface of the sea, which persists for a long time. Therefore, at present, the periscope is protruded above the surface of the sea periodically for a few seconds, necessary for making observations, and is now hidden until it reappears after a certain period of time. The wave formation caused in this case is significantly closer to the usual disturbance of sea water.

The difference in temperature in the pipe and in the environment, combined with air humidity inside the periscope, leads to fogging of the optical system, to eliminate which devices are installed for drying the periscope. An air tube is installed inside the periscope, led into the upper part of the pipe and coming out at the bottom of the periscope. On the other side of the latter, a hole is made from which air is sucked out of the periscope and enters a filter charged with calcium chloride (Fig. 15), after which it is pumped into the upper part of the periscope by an air pump through the inner pipe.

Periscope tubes must meet special requirements for strength and rigidity in order to avoid damage to the optical system; in addition, their material should not affect the magnetic needle, which would disrupt the operation of ship compasses. In addition, the pipes should be especially resistant to corrosion in sea water, because in addition to the destruction of the pipes themselves, the tightness of the connection in the seal through which the periscope extends from the boat’s hull will be disrupted. Finally, the geometric shape of the pipes must be particularly accurate, which, if they are long, creates significant difficulties in production. The usual material for pipes is low-magnetic stainless nickel steel (Germany) or special bronze - immadium (England), which has sufficient elasticity and rigidity.

Strengthening the periscope in the hull of a submarine (Fig. 16) causes difficulties, depending both on the need to prevent sea water from getting between the periscope tube and the hull of the boat, and on the vibration of the latter, which interferes with the clarity of the image. The elimination of these difficulties lies in the design of an oil seal that is sufficiently waterproof and at the same time elastic, securely connected to the hull of the boat. The pipes themselves must have devices for quickly raising and lowering them inside the boat hull, which, with the periscope weighing hundreds of kg, leads to mechanical difficulties and the need to install motors 1, which rotate winches 2, 4 (3 - inclusion for the middle position, 5 - manual drive , 6, 7 - handles for the clutch mechanism). When the tube is raised or lowered, observation becomes impossible because the eyepiece quickly moves vertically. At the same time, the need for observation is especially great when the boat surfaces. To eliminate this, a special platform for the observer is used, connected to the periscope and moving with it. However, this causes overload of the periscope pipes and the need to allocate a special shaft in the ship’s hull to move the observer. Therefore, a stationary periscope system is more often used, allowing the observer to maintain his position and not interrupt his work while moving the periscope.

This system (Fig. 17) separates the ocular and objective parts of the periscope; the first remains stationary, and the second moves vertically with the pipe. To connect them optically, a tetrahedral prism is installed at the bottom of the pipe, etc. the light beam in the periscope of this design is reflected four times, changing its direction. Since the movement of the tube changes the distance between the lower prism and the eyepiece, the latter intercepts the light beam at various points (depending on the position of the tube), which disrupts the optical unity of the system and leads to the need to include another movable lens that regulates the beam rays according to the position of the pipe.

Typically, submarines have at least two periscopes installed. Initially, this was caused by the desire to have a spare device. Currently, when two periscopes of different designs are required - for observation and attack, the periscope used during the attack is at the same time a spare one in case one of them is damaged, which is important for performing the main task - surveillance. Sometimes, in addition to the indicated periscopes, a third, spare one is installed, used exclusively when both main ones are damaged.

Army periscopes are distinguished by greater simplicity of design compared to naval ones, while at the same time maintaining the main features and improvements of the device. Depending on the purpose, their design is different. A conventional trench periscope consists of a wooden pipe with two mirrors (Fig. 1). The design of the periscope tube is more complex, including an optical refractive system, but not distinguished by any special dimensions; such a pipe is usually designed on the principle of a panoramic periscope (Fig. 18).

The dugout periscope (Fig. 19) is similar in design to the simplest type of naval periscope and is intended for making observations from shelters.

A mast periscope is used to observe distant objects or in the forest, replacing inconvenient and bulky towers. It reaches a height of 9-26 m and consists of a mast that serves to strengthen the optical system, mounted inside two short large-diameter pipes. The eyepiece tube is mounted on a carriage at the bottom of the mast, and the objective tube is mounted on the retractable top of the mast. Thus, in this type there are no intermediate lenses, which, despite a significant magnification (up to x 10), with a low mast position causes a decrease in the latter as the mast extends, with a simultaneous decrease in image clarity. The mast is mounted on a special carriage, which also serves to transport the device, and the mast moves. The carriage is quite stable and only in strong winds requires additional fastening with bends. The periscope is successfully used in technology to inspect holes drilled in long forgings (shafts, gun channels, etc.), to check the absence of cavities, cracks, and other defects. The device consists of a mirror located at an angle of 45° to the channel axis, mounted on a special frame and connected to the illuminator. The frame moves inside the channel on a special rod and can rotate around the axis of the channel. The telescopic part is mounted separately and is placed outside the forging under study; it serves not to transmit an image, as in an ordinary periscope, but to better view the field of view captured by the periscope.