This is a short article by Tom Lum on his innovative digital readout caustic tester design. The use of digital micrometers as the readout method makes the tester easy to use in the dim light while testing.
A Versatile Spherometer
A Spherometer is an almost indispensable tool for the amateur optician. This project shows how I built mine.
A Foucault Tester
Foucault testers are actually very simple to make. Here are some ideas for yours.
An 18 Point Mirror Cell
This project depicts the construction of an 18 point floatation cell for a 17.5" mirror. Approximately 50 hours were required to machine the various parts.