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Hand-held spectroscope
par arpruss
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This is a simple hand-held spectroscope designed around [standard 2" x 2" interference grating slides](https://www.ebay.com/itm/326433248564). The spectroscope has a slit for inserting the grating slide--if it doesn't fit, just sand the slit. You may also need to sand the main optical slit or clean it up with a razor.
There are two ways of making it. The cheaper way is to use a cardboard tube and just print two end-pieces. I used a paper towel roll. The more expensive way is to print it all in one piece.
To use it, point it in such a way that the light source lights up the slit and the light goes straight down the middle of the tub. Then look through the eye-hole, which is at a 30 degree angle to the light. Do NOT point at the sun.
There are two ways of making it. The cheaper way is to use a cardboard tube and just print two end-pieces. I used a paper towel roll. The more expensive way is to print it all in one piece.
To use it, point it in such a way that the light source lights up the slit and the light goes straight down the middle of the tub. Then look through the eye-hole, which is at a 30 degree angle to the light. Do NOT point at the sun.
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