Abstract
THE literature relating to modern methods of glass grinding and polishing is scanty, perhaps because this is traditionally a hand craft, differing little in essentials from the practice of three hundred years ago, and each worker guards jealously the methods handed down to him as valuable professional secrets. Though machines for glass polishing were projected by Descartes and others, there is no record of these being successful until Lord Rosse constructed the machine for making his large astronomical reflectors ; this reciprocated the polisher on the revolving work and seems to have standardized this stroke, regarded as the only one satisfactory for accurate 'figuring' until the late Mr. W. Taylor, twenty-nine years ago, showed the feasibility of the more efficient round-stroke machine. Prism and Lens Making A Text Book for Optical Glassworkers. By F. Twyman. Pp. iv + 178. (London : Adam Hilger, Ltd., 1942.) 15s. net.
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