Type 190 Ballistics Longitude-Latitude Photographic Plate (BLL, photoplate) is dedicated for night photography of luminous ballistics of conventional or strategical arms.

190弹经纬照相干版适用于各种常和尖端武曳光弹的夜间拍摄[*]。

The process beginnng from powder burning to the ejection pistons pushing out the bomb and its moving back was analyzed applying classical interior ballistics and gasdynamics theory.

给出了对某型号挂弹钩的实例计算，计算结果与试验结果基本相符。