Virginia medical semi-monthly (1896) (14586277499)

Identifier: virginiamedicals1189unse (find matches)

Title: Virginia medical semi-monthly

Year: 1897 (1890s)

Authors:

Subjects: Medicine

Publisher: Richmond, Va. : (L. B. Edwards)

Contributing Library: The College of Physicians of Philadelphia Historical Medical Library

Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

Text Appearing Before Image:

all photographing, and then anynumber of prints can be obtained that are de-sired. It will be noticed that this procedure re-quires considerable time and the expenditureof considerable labor. By this method, a shadowgraph is obtained ofthe most solid substances. Fluoriscope. While the world has been much benefited bythe discovery of Roentgen, it remained for Sal-voni, of Italy, and Professor Maggie, of Prince-ton, to simultaneously announce the discoveryof the fluoriscope, which has added much tothe efficiency of this method. The fluoriscope consists of a layer of tungstateof calcium in crystals spread on the inside of apasteboard cover box, and so arranged as toexclude every particle of light from the outside. This screen is impermeable to every kind oflight save the X rays. Used in connection withthe X rays, the shadow of the object to be pho-tographed (being held near the fluorescent tube)is reflected on the tungstate of calcium screen 1897.) THE VIRGINIA MEDICAL SEMI-MONTHLY. 599

Text Appearing After Image:

Ruhinkorfstcoil and vibrator^with Crooks-tube^connected, and the improved Huoriscope and connections, 600 THE VIRGINIA MEDICAL SEMI-MONTHLY. (February 12 and permeates the same, giving to the observeran accurate image of the most solid substances. To be most effectual, this investigation shouldbe conducted at night or in a dark room ; other-wise it takes the eye some time to accommodateitself to the darkness of the fluoriscope. Recently, L. E. Knott has perfected a spe-cially prepared paper for use instead of plates.This is a great advance over the plate method,as there is no danger from breaking. Less ex-posure is required, the cost is reduced one-half,and they are more easily handled. Many difficulties that beset the plate methodhave been overcome by the X-ray paper—viz,instead of making several exposures of differ-ent lengths of time, several sheets of the paperare superimposed and then some will doubtlessbe satisfactory. Then, often I have found thatthe plate method was unsatisf

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1896

The College of Physicians of Philadelphia and the National Endowment for the Humanities

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