Reply To: An old brass refractor.

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David Arditti
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Here’s pictures of the military sighting gadgets I have here. The shorter one is a black-painted brass tube with both a helical focus and a moveable rack-and-pinion adjusted objective, for some reason. Gives an inverted image. No maker name. The other is by REL, Canada, dated 1942. It is a unity power telescope with an extendable objective shield and reticle, gives an erect image, and is a bit lighter than the other one. It looks exactly like a brass bicycle pump.

These gadgets always tend to be too heavy for their optical power to be of any use for astronomy.