Top of Simulator is WWII hydraulic powered float plane (OR logic gate) on catapult (a battleship might have up to four). Note two coils on right side, are mounted one foot apart on take-off end. When Alnico magnet (a permanent magnet) on bottom of launching sled passed over first one coil and then second coil a time difference is calculated and sent to meter which reads MPH speed of sled at take-off. If we have a headwind for plane and desire 60 MPH catapult assist to make sure plane will fly and not injure pilot or unnecessarily stress float plane, speed calculations can be done. 60 MPH = 88 feet per second. 1 second / 88 feet per second = 11.36 milliseconds time difference as permanent magnet passes over two coils. The 11.36 milliseconds registers to a dial indicator as 60 MHP.
Bottom circuit is to test bullet speed. First, fully charge capacitor. With left SPST switches closed and right DPST switch in up position.
The two left SPST switches are aluminum foil strips bullet passes through (open left then right SPST switch). Right DPST is switched down to show amount of charge on Galvanometer (shown as Ampere meter). Use math to calculate discharge time and bullet speed.
If .22 Long Rifle Rimfire bullet expect 934.5 microsecond to travel one foot.
This circuit is demonstrated at: https://nationalmaglab.org/education/magnet-academy/watch-play/interactive/bullet-speed
