Polariscopes are one of our most useful instruments. They come in a wide variety of prices and qualities. A new Gem Instrument’s polariscope costs close to $400 with shipping. The simplest polariscope is made by laying a $1 filter on top of a flashlight and hand holding another above it. This is awkward, but it works.
I learned on a Hanneman polariscope, which is as basic as they come. Rather than having its own light source, it comes …
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