Walsh, David · London : Baillière, Tindall and Cox · leaf 40
into theprimary wire. The current immediately changes the soft ironcore into a magnet which attracts the iron hammer on thevibrating steel, and the two platinum points are separated. Thecurrent ceasing to flow, the core is demagnetized, and no longerattracts the hammer, which falls back to its… … Fig. 12.—Veil Contact-breakek. vided for by Mr. Apps with a simple but efficient contrivance, inwhich the rate of the break is regulated by a screw that can bemade to stiffen the hammer-spring, and thereby slow the vibration,or vice-versa. The top screw regulates the amount of current,and the lower…
X-rays · Radiography
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