Reclaiming the maimed; a handbook of physical therapy . Fig. 17. — Diagram of faradic coil. A. Core and primary coil. B. Condenser. D. Secondary coil and terminals -\ . c, b, d. Armature. currents are produced; (5) an iron core in the center of thewooden bobbin which becomes magnetized by the currentspassing in the coils, (6) binding screws to which electrodescan be attached to convey the current from the primary orthe secondary coil to the patient. When a current source is connected with the bindingscrews, from an outside, a circuit is completed as in the fol-lowing diagram: RECLAIMING THE MA
Reclaiming the maimed; a handbook of physical therapy . Fig. 17. — Diagram of faradic coil. A. Core and primary coil. B. Condenser. D. Secondary coil and terminals -\ . c, b, d. Armature. currents are produced; (5) an iron core in the center of thewooden bobbin which becomes magnetized by the currentspassing in the coils, (6) binding screws to which electrodescan be attached to convey the current from the primary orthe secondary coil to the patient. When a current source is connected with the bindingscrews, from an outside, a circuit is completed as in the fol-lowing diagram: RECLAIMING THE MAIMED 25 (i) Through binding screw, A. (2) Up the metal support, B. (3) Along the limb of the hammer to the contact screw, C. (4) From the contact screw to the primary coil, D. (5) From primary coilto electromagnet, E. (6) From electromag-net to binding screw, F. (7) Thence back tocell. At the moment thatthe current passes fromthe cell through the cir-cuit, the iron rod E isconverted into an elec-. FiG. 19. — Current closed. Current open. tromagnet strong enoughto attract the head of thehammer, thus drawingdown the limb of thehammer out of touchwith the contact the hammer leavesthe contact screw, thefollowing sequence ofevents takes place: 26 RECLAIMING THE MAIMED (i) The circuit is broken at the contact screw. (2) The current ceases to flow. (3) The iron rod ceases to be a magnet. (4) The hammer is released, and is caused to fly back tothe contact screw by the tension of its wire spring. (5) The circuit is remade at the contact screw. (6) The current again flows through the circuit. (7) The iron rod is remagnetized, attracting the hammer toit and again breaking the circuit. (8) This sequence of events occurs again and again withgreat rapidity: thus the constant current from the cell isautomatically converted into the rapidly interrupted currentof the primary winding. The rate at which these interruptions can be produced canbe varied by adjustments of the interrup
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectwoundsandinjuries
