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#1
31-10-16, 03:00
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I thought that piece mounted to the tripod might be part of a heliograph. I can't imagine what else it might be for. The thread on the mounting bolt is quite a bit smaller than on the map board.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set 1940 Cab 11 C8 cab and chassis 1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun 1940 Cab 11 F15A w/ Chev rear ends 1941 Cab 12 F15A 1942-44 Cab 13 F15A x 5 1942 cab 13 F15A with 2B1 box 1943 cab 13 F15A with 2H1 box 1943 Cab 13 C8A HUP 1944 Cab 13 C15A with 2C1 box 1943 Cletrac M2 High Speed Tractor MkII Bren gun carrier chassis x 2 
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#2
31-10-16, 03:30
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In fact, I have the head of a heliograph sitting on the desk here now (has been for a number of wweks/months now which shudl indicate what a mess my desk is) and iot does not look like your part has any relation to it.
I suspect the military may have kept the bases of their instruments limited to 3 or so basic patterns so you did not have to make a new tripod variant for each item.
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#3
31-10-16, 05:42
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Here's one like mine for mounting a theodolite.
I also found mention of one being used by Scott on his Antarctic mission. Like you say, they would have used them for multiple applications.
__________________
1940 Cab 11 C8 Wireless with 1A2 box & 11 set 1940 Cab 11 C8 cab and chassis 1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun 1940 Cab 11 F15A w/ Chev rear ends 1941 Cab 12 F15A 1942-44 Cab 13 F15A x 5 1942 cab 13 F15A with 2B1 box 1943 cab 13 F15A with 2H1 box 1943 Cab 13 C8A HUP 1944 Cab 13 C15A with 2C1 box 1943 Cletrac M2 High Speed Tractor MkII Bren gun carrier chassis x 2
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