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1944 Fiberglas Print Ad USMC Marine Officer Jungle Battle Signal Corp Microphone
Getting the jump on the jungle
IN THE PICTURE, you see a U. S. Marine Corps officer using one of the new lip microphones -a device which prevents the thunderous noise inside a tank or the rattle of a machine gun from interfering with the clear transmission of speech.
It is part of the equipment which enables scouting parties and armored vehicles to com-municate with each other and with head-quarters.
To the Signal Corps fell the job of making sure that the microphone would operate de spite abuse and rough handling in the climatic conditions of a South Sea jungle, for example.
So, they got the jump on the jungle by simu lating combat conditions, and several design problems became conspicuous.
(1) Cooperating with Eletro Voce Mig Co, lu
One of these problems was to find a suitable material for two tiny but vital washers. A resilient but extremely uniform material was needed.
If troops were to have the benefit of this valuable piece of equipment, a completely new and different material had to be found, out of which to make the vital little washers.
Fine, Glass Fibers
Eventually, after trying many materials, the Signal Corps suggested a new and different kind of glass called Fiberglas. The kind of Fiberglas used was a thin, wafer-like sheet made of fine glass fibers.
It was unaffected by mois-ture... so apringy that under tests the microphone could be
dropped 10,000 times on edge with no damage so uniform in thickness that the pressure exerted by these washers would not distort the thin, metal diaphragms and interfere with the transmission of speech.
Gray Matter... a Weapon
Here you see the Signal Corps using a new material to its best advantage! This is the sort of technical alertness and imagination which is making our fighting equipment the best in the world.
Consequently, there\'s 24-hour production at Fiberglas-so that the Army and Navy will have our product in steadily increasing amounts for their many requirements. Owens-Corning Fiberglas Corporation, Toledo 1. Ohio. Fiberglas Canada, Ltd., Oshawa, Ontario.
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