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U. S. Army Signal Corps Insulators
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The U. S. Army Signal corps comes to the insulator collecting for the obvious reason: they needed insulators, used lots of them, and had their own unique designs.

...Surprising few designs, though. They are best known for the IN-63 ramshorn. This is a ramshorn-type insulator, but used with the ramshorn sticking up, not hanging down; from the bottom of the composition body hands a threaded metal rod, for attachment to a PT-29 metal pole-top, which in turn sits on top of (and is nailed to) a 14' PO-2 lance pole.

While this is honestly a ramshorn insulator, it is of recent origin: speculation has it either WW I or WW II era.


·Signal Corps Storage Catalogue