CAMD RF 38-11355-644: "To the chief of the 3rd Division of GABTU KA
Here are the project description and blueprints, for your confirmation, of the aiming device for night-time fire from a tank, built as a result of contract #BZ-415 from May 29th, 1941...."
Some tedious bureaucracy comes after, but then, blueprints:
- The Prism device has the following dimensions: 180 mm in height, 120 mm in width, 135 mm in depth, and is shaped the same as a T-34 driver observation device.
- Main elements of the device:
- Driver's observation device "Prism" with a cover.
- Power supply for the electro-optical converter.
- Two headlights with light filters.
- Main elements of the observation device:
- Two lenses with a 90 degree optical axis.
- Refractor system with a 90 degree optical axis.
- Two eyepieces with an 8 mm pupil.
- Optics with 1:1.25 magnification, 20 degree observation angle, and 1:1.2 light amplification.
- Inside of the Prism are two electro-optical converters with the resolution of 10 lines per millimeter, and sensitivity of 10 microamperes per lumen.
- For a high voltage power supply for the electro-optical transformers, a 20 kilovolt power supply is used. The main elements of the power supply are:
- Two base 2NKN-10 batteries.
- Inductor coil.
- [I can't translate this component. The original says безнакальный кинотронный выпрямитель. Some kind of heat-less straightener.]
- Elements of the power supply fit into a container 165 mm by 145 mm by 110 mm in size.
- The device enables the driving of a T-34 column at night, with a closed driver's hatch, with a speed of 10-12 kph.
- While stationary, the device can show a person and his movements, trees, bushes, and buildings, at a distance of 20-25 meters, in an area 8-10 meters wide.
- While moving, the device can show 20-25 of road without a well defined boundary.
- The device is simple to use and does not inconvenience the driver.
- The lights have a constant focus. Each bulb consumes 100 watts, at 12 volts. The lightbulbs draw power from the tank's battery. The bulbs should last 25 hours.
- Projectors can shine both IR and visible light.
- The device and all of its spare parts fit in a special container."