The story of Pittsburgh: Glass

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Multivolume work

Identifikator:: 1831622599

Document type:: Multivolume work

Title:: The story of Pittsburgh

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1919-1930

Collection:: Economics Books

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Volume

Identifikator:: 1831623056

URN:: urn:nbn:de:zbw-retromon-239768

Document type:: Volume

Title:: Glass

Volume count:: Vol. 1, nr. 5

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1920

Scope:: [ca. 16] Seiten

Digitisation:: 2022

Collection:: Economics Books

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Chapter

Document type:: Multivolume work

Structure type:: Chapter

Title:: Glass

Collection:: Economics Books

The Story of Pittsburgh GLASS 5 HERE is scarcely a form of manufactured glass in which Pittsburgh does not take the lead, from window glass and lamp chimneys to optical glass and astronomical lenses. Very large is the city’s production of plate glass, win- dow glass, pressed table ware and lamp chimneys. The finer manufactures in glass are represented by establish- ments which make diffracting prisms, used in lighthouses, lenses for telescopes, opera glasses, microscopes and range- finders. Dr. John A. Brashear, who recently died, mourned by thousands who knew him personally, and to whom he was “Uncle John”, enjoyed an international reputation as an astronomer and a maker of the finest telescopic lenses made anywhere in the world. His establishment was known the world over for the excellence of the lenses it produced. The Encyclopedia Americana, the most recently pub- lished work of this character, speaking of Pittsburgh, says: “The total production of plate glass in the district in 1918 was nearly 60,000,000 square feet, which, if made into one sheet, would cover an area of 1877 acres, or make a pane of plate glass three miles high by one mile wide; and the ordinary window glass made here, would, if in one piece, oe a pane nearly three times as large.” The invention of glass occurred at so early a date in :he history of the world, as to be lost in obscurity. The method of its discovery is a matter of surmise. Obsidian, which is found in volcanic discharges, was the earliest form of transparent matter. It was used by the ancient Egyp- tians in the manufacture of various objects. The Romans and the early Mexicans also fashioned articles from obsidian.

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