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Colour Glasses
19. Two colour glasses are provided which can be introduced singly or together near the focal plane of the eyepiece. One of the glasses is a bright orange and the other a very deep neutral. The neutral glass had the appearance of being a lightly metallisied glass.
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If this info is of any help for the masks: The orange filter served for preventing blending when looking against sunrise/sunet. The deep gray one was intended to eliminate the bright refelections in the peak of the waves.
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Based on photos of U-boat parts
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The picture you posted with the four torpedo tubes is from the bow torpedo room. The indicator with ALL torpedo tubes that was in the conning tower looked different in its layout (But the light bulbs and metal panel texture were identical):
Here is one from a Type IX (U-505) so you can see where it was located in the conning tower and how it looked like:
Keep the good job
