File:American X-ray journal (1899) (14733796726).jpg

Identifier: americanxrayjour5618unse (find matches)
Title: American X-ray journal
Year: 1900 (1900s)
Authors:
Subjects: X-Rays Radiography
Publisher: St. Louis : American X-Ray Publishing Co.
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

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in Thera-peutics. By. N. Tesla. Difference Between Roentgen and Cath-ode Rays. The Wehnelt Interrupter. Potential Gradients in Vacuum Tubes. Paying Damages For Prolonging a Pa-tients Life. American Electro-Therapeutic Assn. SEP 291939 1£9255 DR. GEORGES APOSTOLI. Paris, France The American X-Ray Journal. Devoted to Practical X-Rav Work and Allied Arts and Sciences. VOL. 5. ST. LOUIS. JULY. 1899. MO. 1. ROENTGEN LIGHT NOTES. BY WILLIAM ROLLINS. NOTE XLV SUPPLEMENT TO NOTE XLI. In the accompanying Fig. 42 is showna form of internal diaphragm tube men-tioned in Note xli. For most medicalwork the best definition is of less im-portance than the amount of light, but flections from reaching it, we make astep toward better results. The ap-pearance of the tube when excited isshown in Fig. 43. The second lightring is produced by the forces whichcome through the opening in the dia-phragm. The wide dark ring is theshadow of the diaphragm, as everythingbeyond this central light circle is cut off
Text Appearing After Image:
Fig. 42. — Roentgen Light Note: there are structures like the teeth andbones where it is valuable. By com-bining the internal diaphragm with thethick glass diaphragm, shown in Fig. 34and in section in Fig. 42, we much im-prove the definition, and if, in addition,we cover the part to be photographed bya perforated screen of non-radiable ma-terial to prevent diffused light and re- 1.—Internal Diaphragm Tube. by the external diaphragm; practicallyall the waves which are used comethrough the central opening in the inter-nal diaphragm, so that the utilized radi-ant area is always small. NOTE XLV1—THE ANODE RUSH. In Note xx the anode rush was men-tioned and its effects on the target figur-ed in Note xxi. Here is a figure of the 594 THE AMERICAN X-RAY JOURNAL. deposit it produces on the glass wall ofthe tube. Fig. 44 is a half-tone from a pho-tograph of a hollow target intermolecu-lar regenerative tube which has beenexcited 600 hours without repumping.Notice the central dark figure fro

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