File:Induction coils - how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery (14571103959).jpg

Identifier: inductioncoilsho00schn (find matches)
Title: Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery
Year: 1901 (1900s)
Authors: Schneider, Norman H. (Norman Hugh)
Subjects: Induction coils Radiography X-rays Radiography
Publisher: New York : Spon & Chamberlain London : E. & F.N. Spon
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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utton situ-ated at any desired location, and having awhite and black button, one for lightingand the other for extinguishing. The prin-cipal automatic burners are the Holtzer, theBoston, and the Bartholdi, between whichthere lies little choice, so admirably are theyconstructed. Bartholdi Automatic Burner. Instead of a rotating stop-cock, as inother automatics, a gravity valve is em-ployed in the Bartholdi, which is held to itsseat by the weight of the armature andconnecting stem, as shown in Fig. 57. Whenthe gas is turned off the valve rests uponits seat, as indicated in the cut. By a closureof the electric circuit at the turn-on button,two of the helices M P are energized, cans-mg the armature / to be lifted, thus, bymeans of the stem H, raising the valve Gfrom its seat into the dotted position, andopening the gas way so that the gas may 1/2 Gas Lighting. issue to the tip, as shown by the arrows.At the same time, the top of the valve strikesagainst the end of the lever W, causing the
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circuit to be broken at the spark points T U,resulting in a continuous sparking as longas the finger presses the button. The magnet Gas Lighting, 173 when raising the armature has also twistedor partially revolved it, so as to bring thenotch d in the armature over the end of thehook e, as shown in dotted lines. Whenthe circuit is broken by lifting the fingerfrom the button the notch falls into thehook and the valve is locked open. To extinguish the flame the turn-offbutton is pressed, when a second magnet(not shown in cut) lifts the armatureand twists it in the opposite direction, sothat when the circuit is broken the armaturefalls free to its normal position, closing thevalve. In wiring up an automatic burner it isnecessary to run two wires to it, one fromthe white button and another from blackbutton on push plate S. Reference to Fig. 58will make this clear. Most burners areprovided with two binding posts inside thebrass case, and the wires are run througha rubber-bushed hole in the

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