Illustrated and descriptive catalogue of Roentgen X-ray apparatus and accessories : apparatus for the generation and application of high frequency currents. Apparatus for the therapeutic application of light energy.

  • Kny-Scheerer Company
Date:
1905
Catalogue details

Licence: Public Domain Mark

Credit: Illustrated and descriptive catalogue of Roentgen X-ray apparatus and accessories : apparatus for the generation and application of high frequency currents. Apparatus for the therapeutic application of light energy. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    The Kny-Scheerer Company, New York. Telegraphic Address: EXRAY-NEW—YORK. » g trolled with exactness and precision, it has been of great service in* the practice of internal medicine in preventing errors of diagnosis. The other discovery was that of Hildebrand, who introduced stereoscopy into the Roentgen method of treatment. By its aid one can not only determine the depth at which foreign bodies are located, but can actually see in a plastic condition the arrangement of the bones and other tissues. This discovery was of especial importance as an aid in teaching anatomy. Some two hundred methods of measuring have been devised for the purpose of determin- ing with accuracy the position of foreign bodies which may have become lodged in the internal organs. Some of them have been applied with and some without the assistance of mathematics. Benoist has constructed a scale which is the first which has been found practicable for measuring the average power of penetration of the X-Rays. Sagnac investigated the secondary rays in 1900, and he with other French investigators was the first to endeavor to overcome their harmful effects in examinations and in transillumina- tions by protective boxes and diaphragms. A practical method of procedure for general purposes, however, was only available when Wiesner and afterward Albers-Schonberg, though quite independently, had improved the apparatus, and had introduced the elements of compression into the method. At the present time the diaphragm method of controlling the secondary rays is employed in every properly equipped Roentgen institute. Radiotheraphy, the treatment of various diseases of the skin, and especially the treat- ment of cancer, which had first been suggested by Freund of Vienna, had brought forth results which have filled the world with amazement. Still the results obtained by individual investi- gators lacked uniformity as long as there was lacking also the means of administering the X-Rays, as a therapeutic agent, with precision of dosage. In 1901-2 Holzknecht invented his chromoradiometer, which is a satisfactory and accurate measuring instrument for this purpose. Since this discovery was made practical it has become possible for medicine to lay down exact statements for its investigations in this direction. At about the same time that Holzknecht made his discovery Dessauer made his first Roentgen tube. With this tube one is enable*! to change the power of penetration of the X-Rays without changing the vacuum, by means which are entirely electrical, namely, by changing the potential of discharge of the cathodal rays. This method has been of especial importance in the practice of internal medicine. Levy and Gundelach in 1902 completed the so-called throttling or valve tubes which are connected in series with the Roentgen tubes. By their use the life of the tube is considerably lengthened. Under the stimulating influence of different investigators, but especially that of Albers- Schonberg and Holzknecht particular attention has recently been paid to various contrivances for protection from the harmful influences of the X-Rays. Sheets of lead glass, which is im- permeable to the rays though quite as clear as plate glass were brought into use. Holzknecht covered lead foil on both sides with pure rubber sheeting which could be used as a kind of aseptic mask. Grisson constructed a powerful and useful current rectifyer for use in the Roentgen ap- paratus, on the basis of the Gratz cell. These, in a few words, have been the most important events in all that pertains to the Roentgen method, from the time of the discovery of the epoch making phenomenon until now. Revived interest is beginning to be manifested in this diagnostic and therapeutic agency, the most beautiful gift which physics has ever made to the science of medicine. Ai_»_ Our Products nfissx: Are Guaranteed 3EA.R OUR TRADE NL MARK FOR IDENTIFICATION
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