Electronic Instrumentation for Underwater Ordnance Development and Evaluation

An important difference between the underwater weapons of World War II and their predecessors was the use of electronic devices both in the weapons and in the techniques for their development and evaluation. Some of these techniques have now been made available, of which four are described; namely: (1) a recording accelerometer which gives the time-acceleration curve for a missile dropped at high speed into the water; (2) acoustic instrumentation used in the ranging of torpedoes; (3) a system for recording very low-frequency acoustic waves; and (4) a system for telemetering back information from a free weapon operating under water.