American quarterly of roentgenology (1911) (14570227960)

Identifier: americanquarterl03amer (find matches)

Title: American quarterly of roentgenology

Year: 1911 (1910s)

Authors: American Roentgen Ray Society

Subjects: Nuclear Medicine Radiography Radiology Radiology

Publisher: Pittsburgh : American Roentgen Ray Society

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

Text Appearing Before Image:

Fig. 1. Enlargement of photograph of the Gehler folie screen.Exposure one second.

Text Appearing After Image:

Fig. 2. Enlargement of photograph of Gehler folie screen.Exposure four seconds. Caldwell: Roentgen Kinematography 39 atus will be more fully described in another publication. Theperformance of this apparatus demonstrates the entire feasi-bility of producing such currents, and the advantages thatwere expected from excitation of X-ray tubes in this way. For kinematographic work, however, still more speed isnecessary, and the most apparent method of obtaining it isby making lenses working at wider aperature than those incommon use. Inquiry among many prominent lens makersdeveloped the fact that the fastest lenses regularly madework at about F2, which is only about five times as fast asthe fastest lenses used in hand cameras. The photographs shown in the accompanying cuts, figures1 and 2, were made with a lens working at F4.5 of a 14 x 1?Gehler folie excited by an X-ray tube taking about sixtymilliamperes. The exposure for the thorax was about fourseconds, and that for the arm about one s

American Quarterly of Roentgenology 1911 Buchillustrationen Medizin Röntgen Röntgenstrahlen medizinische Geräte Geschichte der Technologie hohe Auflösung Bilder aus dem Internetarchiv

1911

Francis A. Countway Library of Medicine

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