(under subclass 160) Subject matter wherein the means for producing a speed signal includes means responsive to the passage (event) of an object past a plurality spaced locations.
(1) Note. This subclass includes, for example, systems for measuring the time taken by an object such as projectile or vehicle to move through a measured distance. The "event" being the passage of the object past the ends of the measured distance.
SEE OR SEARCH THIS CLASS, SUBCLASS:
181+, for systems for measuring the duration of time intervals.
SEE OR SEARCH CLASS
73, Measuring and Testing,
167, for apparatus for testing ordinance and projectiles. 346, Recorders,
38, for recorders actuated responsive to ordinance.
