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Kind of cute, and very understandable. Channel-surfing I came across “Sherlock Holmes and The Secret Weapon” — Basil Rathbone in a 1942 film about a new, improved bombsight that Moriarty wants to steal. Gotta take a look! So I tune in just as the bombsight inventor is taken aloft in a bomber to demonstrate how capable his new invention is. He sits in front of his device, which somehow allows him face forward but also look down vertically to his target. He then grasps a switch and releases the bombs.
But as I looked, and looked again, I thought that bombsight looked familiar. Then it all came clear — the director sat the actor in front of a photo enlarger, stare through the cantilevered uprights, and press the switch normally used to turn the enlarger on and off. They shone a light on his face to boost the impression of outside illumination. As the “device” is seen only briefly, the public viewers of 1942 wouldn’t know the difference, and in the midst of real war it’s easy to understand that using an enlarger was perhaps the best they could come up with at the time.
And later Holmes uses the same enlarger, as an enlarger, to read a cryptographic code on a sheet of paper, after soaking it in “fluorescent salts” and making a photography using ultra-violet light. Photography to the rescue!

But as I looked, and looked again, I thought that bombsight looked familiar. Then it all came clear — the director sat the actor in front of a photo enlarger, stare through the cantilevered uprights, and press the switch normally used to turn the enlarger on and off. They shone a light on his face to boost the impression of outside illumination. As the “device” is seen only briefly, the public viewers of 1942 wouldn’t know the difference, and in the midst of real war it’s easy to understand that using an enlarger was perhaps the best they could come up with at the time.
And later Holmes uses the same enlarger, as an enlarger, to read a cryptographic code on a sheet of paper, after soaking it in “fluorescent salts” and making a photography using ultra-violet light. Photography to the rescue!


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