American X-ray journal (1897) (14570160760)

Identifier: americanxrayjour1418unse (find matches)

Title: American X-ray journal

Year: 1899 (1890s)

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

Text Appearing Before Image:

FIG. in Fig. 3. The moveable platinum con-tact is carried on a small vertical springbehind the vibrator spring. When thecontact is made the movement of thevibrator is not arrested, as in other formsbut continues to its fall amplitude, thusallowing a long make. The lengthof the make can be varied by screw-ing in or out the other platinum contact.The most important advantage of this of the current joined the two pieces ofplatinum so tightly that the magneticpull was not sufficient to separate them.In the new form, as the break is madewhen the vibrator is at the middle of itsswing, the sudden blow with the entiremomentum of the vibrator head is al -wa3rs sufficient to break the platinumsapart, and once started, the vibratorcontinues in motion until the current is THE AMIiRICA.X A-A. I ) JOlIfX. I /.. 75 turned off. The suddenness of the with an adjustable condenser, and in-break makes it possible to use this form dependent vibrator mounted on the same

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FIG. of vibrator on the 110 volt, as well asbatter) circuits; it also adds very great-ly to the efficiency of the induction coilwith which it is used. A rod screwed into the iron head car-ries a weight which may be moved upand down and clamped in any positionwith a set screw. By this means therate of vibration may be varied withinwide limits. To summarize, the newvibrator has the following advantagesover older forms: First. Its action is independent ofthe current going through the coil. Second. Its rate of vibration is ad-justable. Third. It permits of a long make,and the length of the make andbreak are adjustable. Fourth. The break is very sud-den, increasing the efficiency of the coilsand making it thoroughly adapted to the110 volt circuit. Fifth. It never sticks. The outfits, complete for x-ray work,consist of a coil mounted on abase, withrheostat if used for 110 volt circuit, and base, as illustrated in Fig. 4. In addi-tion to this, a number of tubes, suitablestand, fluoroscopes,

medicine x ray american x ray journal 1897

1897

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