
MACHINES FOR grinding and polishing the concave mirror disks which form the most important part of the reflecting type of telescope are not a necessity, as has been explained in the book "Amateur Telescope Making," and perhaps 95 percent of the mirrors made are done by hand, but it is fun to make a machine which will do this work and again it is fun to watch the wheels go 'round. This month we show several such machines built by amateur telescope makers, also one or two used by professionals.
The first is the Lee machine (page 148, "A.T.M."), made by L. St. John Hely, M.D., 912 Macdonald Ave., Richmond, California. The reciprocating rod which leaves the picture at the right hooks up to a reducing gear with single belt drive and the 1/8 horsepower motor of a band-saw outfit. Dr. Hely finds this machine excellent and says anyone can make it who is "enough of a mechanical genius to open a can of oysters."
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