. Elementary and dental radiography / by Howard Riley Raper . momentarilystops the flow of the current. Then the bubble bursts and the current isre-established only to be stopped again in the manner just described, andso on. The more platinum exposed in the solution the slower the inter-ruptions and the more amperage will pass through the interrupter. Inorder that the amperage may be increased without producing a corre-sponding decrease in the number of interruptions per minute, interruptersare made with several platinum points. (Fig. ; Thus with a multi-point interrupter, when more ampe
. Elementary and dental radiography / by Howard Riley Raper . momentarilystops the flow of the current. Then the bubble bursts and the current isre-established only to be stopped again in the manner just described, andso on. The more platinum exposed in the solution the slower the inter-ruptions and the more amperage will pass through the interrupter. Inorder that the amperage may be increased without producing a corre-sponding decrease in the number of interruptions per minute, interruptersare made with several platinum points. (Fig. ; Thus with a multi-point interrupter, when more amperage is desired, more points are throwninto the circuit by mean.; of small switches for the purpose. A 1 or 2-point X-RAY MACHINES 21 interrupter will draw enough amperage, and give sufficiently rapid in-terruptions, for dental radiographic work. The current is sometimes stopped altogether by the interrupter. Thismay be due to the accumulation of a large bubble of gas, on the platinumpoint, which will not burst. By moving the point—or points if the inter-. Fig. 18. Patent fuses or cutouts. rupter is multipointed—up and down several times by means of lever D,Fig. 20, the bubble will be broken and the current re-established. On a , no-volt circuit the electrolyte should be 15 to 20 percent, acid; on a , 220-volt circuit, from 5 to 8 per cent, is strongenough. The jar should be one-half or three-quarters full. As the solu-tion stands, some of the water evaporates, so raising the per cent, of acidin the electrolyte. As this occurs, more water should be added. Thestrength of the solution can be easily and accurately determined by meansof a hydrometer. (Fig. 24.) As the water evaporates, and the solutiongets stronger, its specific gravity raises. The hydrometer is sensitive tothis change of specific gravity. As the current passes through the interrupter, heat is the glass jar is placed in a metal-lined box. and the box filled withwater. (Fig. 23.) Even with
Size: 2094px × 1193px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookauthorraperhowardriley, bookcentury1900, bookdecade1910
