Tank
With World War II the multi-turreted tanks proved impracticable, and as the single turret on a low hull design became standard, crews became standardized around a crew of four or five. In those tanks with a fifth crew member, usually three were located in the turret (as described above) while the fifth was most often seated in the hull next to the driver, and operated the hull machine gun in addition to acting as a co-driver or radio operator. Well-designed crew stations, giving proper considerations to comfort and ergonomics, are an important factor in the combat effectiveness of a tank, as it limits fatigue and speeds up individual actions.
Tanks of the Polish Armoured Forces
Building of the tank was completed in July 1938. It took so much time because some basic assemblies that were not produced in Poland had to be acquired abroad like an engine of a sufficient output. It was not before 16 August that the 10TP tank rolled out for a first longer ride. It was driven by an experienced military specialist Sergeant Polinarek under personal supervision of the Chief of the Trial and Experiment Department in the Bureau of Technical Studies on Armored Weapons (Biuro Badań Technicznych Broni Pancernych, BBT Br.Panc.) Captain Leon Czekalski. The trials were kept secret because the activities of the German Abwehr and the members of the "Fifth Column" were then getting more and more intensive in Poland.