Quote:
Originally Posted by Jordan Baker
Just looked up in the EMER book. There isn't a firefly specific listing. However under the listing for the Grizzly the insulator is
Mountings, Aerial Bases, No1, mk1 ZA1825 PC 76456 C
Everything else seems to use the
Mountings, Aerial Bases No3, Mk1 ZA1827 PC 76555 C
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No.1 has a steel plate with central hole and threaded bushes for the aerial base securing bolts. It's for a 'through the roof' feeder (Aerial Feeder No.4 or No.5) where the conduit of the feeder supports the variometer and is secured by a nut within the mounting.
No.3 is a plain disc which may be made of rubber, plywood, or steel (two cups seam-welded together) and has holes drilled straight through. It's a stand-off for use with the connector plate on a flat surface and requires nuts and bolts to fit it.
Later they were used together for the WS31AFV and WS88AFV to create enough room under the aerial base to terminate the aerial feeder correctly.
(This also required an additional fixture to simulate the 'conduit' of the WS19 variometer feeder.
Chris.