New Chrono: Garmin Xero C1

[LRRPF52]

Before light optical chronographs, they had:

* Ballistic pendulum (1742). It measured movement of the pendulum to determine velocity.



* Wheel Chronometer (1765)

* Dual wheel Chronometer (1804)

* Bashforth screened chronograph with thread triggers and switches for artillery (1865).

* 1921 Aberdeen Loomis chronograph, using electromagnets and tape.
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Then came Optical, followed by Microwave Interferometry, Doppler, and 3-screen optical (Oehler).

* Optical Chronographs

* Aberdeen Ballistics Search Lab Microwave Interferometer (1953). The Microwave Inteferometer determined the rate of acceleration of a projectile inside the rifle/firearm bore. This apparatus was revolutionary in understanding the traveling charge concept.

* 1956 Aberdeen Proving Grounds Doppler Radar Velocity and Positioning System (DOVAP).

* Oehler’s 3-screen Optical Chronograph, 1977.

* Magnetospeed, 2012.

* LabRadar 2015 using Doppler effect

* SpeedTracker Mach 4, 2023, weapon-mounted Doppler Radar with BlueTooth connectivity.

* Garmin Xero C1, 2023