‘G’ BY FREE FALL APPARATUS
This apparatus consist of a heavy casted base plate screwed with 13 mm. diameter steel rod. Two plastic bases are mounted on the rod to hold two units. Solenoid unit having a mumetal core which insures immediate release of ball on energizing, gate switch unit comprises a hinged steel plate held against a permanent magnet so that with proper adjustment the plate falls promptly with the impact of falling ball. Connections with color coded 4 mm sockets. A centisecond timer is used, with this apparatus.