File:Elementary and dental radiography (1813) (14756809752).jpg

Identifier: elementarydenta00rape (find matches)
Title: Elementary and dental radiography
Year: 1813 (1810s)
Authors: Raper, Howard Riley
Subjects:
Publisher: New York : Consolidated Dental Mfg. Co.
Contributing Library: Dentistry - University of Toronto
Digitizing Sponsor: University of Toronto

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
I-ig. 15. Interrupterless coil. The electrolytic interrupter consists of a glass jar containing a solu-tion of sulphuric acid in water, the electrolyte, in which is immersed aplatinum point electrode, A (Fig. 20), and a lead electrode, B. Theplatinum is covered with a porcelain sheath, C, except for its point, whichprojects into the electrolyte. Little or much of the point may be exposedin the acid by the regulating arm, D. We have two wires now leading from the mains to our apparatus. X-RAV MACHINES 19 Of these one is the positive wire which brings the electric current, anrlthe other is the negative or return wire. The positive wire must be at-tached to the binding ))ost of the ))latin.um electrode, marked +. (Fig
Text Appearing After Image:
Fig. 1(). Induction coil for use with storage cells. 20.) Rut how can wc tell which is the positive wire? Cut some of theinsulation off the ends of the wires, immerse them in a glass of water,and bubbles will be given oft from the negative wire. When makingthis test, care should be taken not to touch one wire to the other, somaking a short circuit. The term (short circuit) almost explains itself.The desired circuit in this instance is from the positive wire, through thewater, which is highly resistive to the flow of electricity, into the negativewire and back to the mains. Suppose that the wires come in contact 20 ELEMENTARY RADIOGRAPHY (that portion of the wires from which the insulation has been removed),the current no longer passes through the water, but takes the shorterpath of less resistance, passing directly from positive to negative wire.All the amperage formerly used and choked back by the resistive waterflows through the wires, heating them rapidly. + - A Switch Sliding Koda

Note About Images