"To the Chief of the 3rd BTU Department, Military Engineer 1st grade, comrade Afonin
In response to your letter #144353s from January 21st, 1941, we respond that in design and production of the T-50 object, experience from the PzIII was used in the following components.
Position of the crew and armament in the turret.
As in the PzIII tank, the T-50's commander is positioned in the rear of the turret, behind the brass catcher. In order to provide circular vision, the turret had a special commander's cupola, 240 mm tall, equipped with 7 (8 in the initial batch) prismatic observation devices, covered with armour. The use of these devices instead of the triplex on the PzIII greatly improves the commander's safety.
As on the PzIII, the T-50's 45 mm gun has two coaxial machineguns. In order to reduce the size of the turret and increase the resistance of the front of the tank against shells, the T-50, unlike the PzIII, cannot aim these machineguns independently.
Additionally, the following components are installed with the PzIII as an example:
- Three-coloured light indicators leading from the commander to the driver.
- Indicator for gun moving past the sides of the tank.
- Mobile lightbulb with electromagnet.
- Individual fasteners in the ammunition racks and tools bin.