Making the Glass Disk for a 70-Inch Telescope Reflector (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Making the Glass Disk for a 70-Inch Telescope Reflector

During succeeding centuries, as the art was developed, glass mak ing became an established industry and the quantity and quality of the product improved. It has only been within the last century, however, that glass making became a problem of scientific interest, and the resulting improvements made soon led to the production of glasses free from color, opaque inclusions, and other visible defects, and to the manufacture of glasses having certain definite composi tions. Such glasses have definite optical properties, and some of them are used in. The construction of precision optical instruments and consequently are referred to as optical glasses.

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