Lab Techniques


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Working with Small Lenses

HERE IS A whole new chapter of interesting material written by Russell W. Porter of the California I..

156.00 Ex Tax: 156.00

Working with Convex Spherical Surfaces

MANY OF the advances in practical optics and telescope making have been made by amateurs. Such an ad..

156.00 Ex Tax: 156.00

Two New Methods of Grinding and Polishing Mirrors

THIS month we shall devote most of our space to an interesting letter from Mr. Vard B. Wallace, a ch..

156.00 Ex Tax: 156.00

The Pencil Test

IN THE LAST stages of telescope mirror grinding the pencil mark test is sometimes resorted to in an ..

156.00 Ex Tax: 156.00

Testing Optical Surfaces

IN 1931, Daniel E. McGuire, a Shadyside, Ohio, farm lad then 17, hit on the use of a slit in place o..

156.00 Ex Tax: 156.00

Telescope Drives. More Mirror Testing Methods.

IF A MECHANISM DOES its intended work, and satisfies its owner, it is a success. A fine telescope dr..

156.00 Ex Tax: 156.00

Slow-Motion Declination Mount, Polishing Hints, Checking a Mirror's Polish

ONE NIGHT last summer James T. Barkelew and Byron L. Graves of Los Angeles, with Russell W. Porter o..

156.00 Ex Tax: 156.00

Setting Circles, Testing Mirrors with "Oil Flats"

SETTING CIRCLES ARE GRADUATED rings that enable the astronomer to set his telescope exactly on desir..

156.00 Ex Tax: 156.00

Schmidt Cameras, Device for Reading Setting Circles, a Very Small Observatory, a Proposed Telescope Drive

IN THIS magazine last June Professor Russell described the Schmidt telescope- or camera, to speak mo..

156.00 Ex Tax: 156.00

Rose Tools

ROSE TOOLS having petals which are tapered, in contradistinction to I tools similarly used for local..

156.00 Ex Tax: 156.00

RFT Cassegrainians, Wax Coating Laps

UNIQUELY, the richest-field telescope, or RFT, because of its special design, reveals in one view of..

156.00 Ex Tax: 156.00

Profile: Russell Porter. How Polishing Works

READERS OF THIS department and friends of Russell Porter-those who have seen him and those who hope ..

156.00 Ex Tax: 156.00

Natural substrate which filters and enhances plant growth.Supports the filter with its large coloniz..
794.55
Ex Tax: 794.55
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