The Wien bridge oscillator is a simple circuit that generates a low distortion sine wave. The version tested in this video uses one operational amplifier, two resistors, two capacitors, a trimpot and a tiny incandescent lamp serving as the automatic amplitude control element (AGC). The circuit runs on -+15Vdc supply.
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Old Polyphonic Guitar Synthesizer GR300 based, some details
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https://www.youtube.com/watch?v=SPtVemrXmFQ
This is a projector 1:2 anamorphic lens, meaning it will make the projected image look twice wider or taller. It was made in Italy by Officine Galileo di Milano, probably in the 50's or 60's. As far as I know, some wide screen movie formats (CinemaScope, Panavision, e.g.), used to compress a wide image to fit into a square frame, this anamorphic lens was then employed during projection to restore the width of the original image, making possible to get a wider image from a standard film frame size. I will stretch an image vertically, making its height twice the original, then draw a square frame around the image, and check if the lens restores the image to its original aspect ratio.
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https://www.youtube.com/watch?v=yu0Bqhg90Bg