Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 49
he hammer reaches either end of its stroke. When thehammer hits the bottom the valve rod is moved upwardsand the hammer started on its upstroke; when it reaches thetop, its motion is reversed and the hammer falls. Thisaction will continue xmtil the steam is shut off at the boiler. One important… … -stic/e volve wasfre stean? anvil Fig. 9.—Steam haimner with automatically operated control valve. must have the element of amplification present or theapparatus will obviously not operate. This general fact istrue in the operation of any self-controlled system of this VACUUM TUBE OSCILLATORS 27…
Radio
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