The wood inside is covered with green baize, and contoured to fit round the instrument. Undoubtedly military, in camouflage green, they come in the sturdy type of wooden box – on that you might have expected to find ammunition inside. This Stereo telescope, or binocular pair of telescopes, was acquired in 2010, and is Accession number 135. The example they showed was of German manufacture, I believe: also on the web I found a photo of a German soldier up a stepladder using one of these for artillery ranging. Very little comes from searches on Google, although a video from explains the principle of operation, in that it extends the distance between the eyes of the operator by around a factor of 10x, so extending his own sense of binocular vision. Stereo telescopes were presumably a development of this technique, and possibly made their first appearance in WW1, but this example, made by Ross, appears to me to be more likely introduced between the wars, and was possibly used in WW2. the elevation gave them the triangulation needed to make more accurate estimates of the position of the shots and the target. The problem is always estimating the range of the target from the weapon, and then in estimating how close the last shot landed – does the range need to be increased by 50 yards or 100 yards? In WW1 telescopes were used by spotters in barrage balloons, to direct the guns…. In military circles, the problem is that the enemy is much further away, particularly when you are worried about artillery ranging to a target. Binoculars are really good at giving a sense of perspective, or depth in an image, particularly when looking at garden birds or whatever else is in the undergrowth… so a Stereo Telescope should be much better, shouldn’t it?
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