[Milsurplus] ART-4

[J. Forster]

At the MIT Flea today, a friend jhad a real aardvark mil radio item. It is
a hollow clear plexi sphere, about 8" in doamerer, with an aluminum plate
clamped between the hemispheres at the equator.

In the center of each hemisphere, there is some kind of sendor, with
roughly a 1.5" diameter and diaphragm behind the hole. I siuspect the
sensors are microphones.

In the center of the sphere, there is an aluminum cylinder, roughly the
sige of a soda can scaled up by 1.5.

Ther thing is marked ART-4 (XA-4)

This is what a quick Google found:

AN/ART-4
Transmitter set, Carried in target sleeve to note the projectiles shock
wave and radio extentr of error to GRR-1.

AN/GRR-1
Receiving set, Used with ART-4 to report errors in rounds fired at a
target sleeve.

Sleeve (or target sleeve) - A tubular cloth target towed by an airplane
for use in air-to-air and ground anti-aircraft gunnery practice. This
sleeve was stored inside the plane until it was slowly released by a cable
and towed (pulled) behind the plane. Gunners in other aircraft, or on the
ground, would shoot color-coded 'live' ammunition at this cloth sleeve.
Once on the ground, the sleeve would be checked for how many hits of which
color...to measure the accuracy of the gunners.

From:  http://www.wingsacrossamerica.us/wasp/resources/glossary.htm

Does anyone know anything more about this system?

-John

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