Small stereo trumpet company "K.Zeiss, No. 3, 1914.

The German trade name of this model is Teleplast. It was used in the RIA field artillery as an observation device for reconnaissance spotters of artillery fire. The magnification of the tube is 10x, the lens diameter is 25 mm. The device is equipped with a wooden handle with a position lock for ease of observation, and an angle-measuring grid is installed in the right eyepiece on the glass of a sample adopted by RIA in 1912 ("cross-shaped" type). The device also included a leather case for storing and carrying the device, two light filters and a special hook-bracket for attaching the device to any wooden objects (through a hole in the handle).

Although the predecessors of this device with the name "Relief Fernnrohr" were developed by the company "K.Zeiss" back in 1893-1894, in the "Russian" catalogues of the main supplier of Zeiss products to Russia at the end of the 19th century, the company "F.Joachim and Co." such devices appeared only in 1897. In June 1897, the Relief Fernnrohr was tested at the RIA Main Artillery Range with a non—binding conclusion based on the test results - "take note." The main advantage of these spotting tubes was initially seen by the manufacturer himself and his contemporaries in the increased plasticity (stereoscopy) of the image (hence their original trade name), and only then did the emphasis shift to the periscope of the device.

Shortly after the Russian-Japanese War of 1904-1905, the GAU and The Field Artillery Rearmament Commission decided to equip observers and scouts of field artillery batteries with hand-held stereo tubes manufactured by K.Zeiss" (at the rate of two per battery).

In 1906-1907, orders for the manufacture of about 1,700 pieces were given to the Optical Workshop of the Obukhov Steel Plant and, a little later, to the FOS factory in Warsaw, although it was originally planned to order most of the small stereo tubes to the company K.Zeiss." As a sample for the receipt of this contract by the company "K.Zeiss introduced Teleplast in 1907. However, the lower price offered by Russian factories and the desire of the State Agrarian University to organize the production of these pipes as soon as possible exclusively in Russia played a role in placing the order. 

In 1911, the company "K.Zeiss once again offered the GAU an already improved Teleplast sample, and again the offer was not accepted — the model was rejected for serial orders as having no special advantages over small stereo tubes. Obukhov plant and factory feedback form.

And only in 1914, two stereo tubes "K.Zeiss. St. Petersburg" under numbers No. 1 and No. 2 passed all the tests with the company "K.Zeiss has signed a supply contract. The outbreak of the Second World War prevented the implementation of the contract and the main number of stereo pipes made in Germany with the brand "K.Zeiss St. Petersburg", apparently, was never made. In any case, in the collections and collections of museums there are small stereo tubes for RIA with the stamp "K.Zeiss. St. Petersburg" are not represented and, perhaps, this sample is the only one that has survived to this day. In the future, small stereo pipes of the company "K.Zeiss" were manufactured already in Riga with the stamp "K.Zeiss. Riga" at the sequestered Zeiss plant, and then in Petrograd Optical Plant of the Main Artillery Directorate with the appropriate branding Such pipes are available in museums and in private collections (in particular, in Poland, in the museum The Polish Army has a small stereo trumpet with the stamp "K.Zeiss. Riga")