The story of Pittsburgh: Education

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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:: 1831623714

URN:: urn:nbn:de:zbw-retromon-241132

Document type:: Volume

Title:: Education

Volume count:: Vol. 1, nr. 14

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1928

Scope:: [ca. 80] Seiten

Digitisation:: 2022

Collection:: Economics Books

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Document type:: Multivolume work

Structure type:: Chapter

Title:: Allegheny observatory

Collection:: Economics Books

John A. Brashear later became connected with the ob- servatory and constructed many instruments for which a demand developed in all parts of the world. He raised suf- ficient funds to build the present beautiful building, costing about $300,000. A 30-inch reflector was built, called the Keeler Memorial Telescope. This is adapted to spectrosco- pic work, and with it were determined the orbits of a large number of spectroscopic binaries, stars which by means of the spectroscope are known to be double, and yet are so close together that the telescope is not capable of show- ing them double. As a memorial to Willlam Thaw and his son, William Thaw, Jr., the immediate families of these men furnished the money, about $125,000, for the erection of the Thaw Memo- rial Refractor. So difficult was the task of making perfect dises, a wait of more than 10 years was necessary before they could be delivered. The second of these discs was sent from Germany only four months before the outbreak of the World War. In April, 1914, after the receipt of this disc, the Brashear Company ground and finished the lens in four months, much the shortest time in which any large lens had ever been finished. The observatory now houses the finest photographic reflector in the world. The present director is Dr. Heber D. Curtis, who has been a member of every important expedition for the ob- servation of solar eclipses in recent years. Four nights a week are allotted to visitors to the observa- tory, and about 5000 persons, many of them from distant parts of the country, and other parts of the world, “see the stars” annually through the facilities offered by the Pitts- burgh University.

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