Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 871
s, by which 840 TELEGRAPH. means its speed may be regulated and controlled ; it is shown in the middle of the diagram.The lamps 11 are in the armature ciicuit in multiple arc, and by turning them on or off,the speed of tlie pole changer may be varied, the field remaining of uniform intensity… … Patten synchronous miiltipU-x telegraph. chronisni, and are re-versed by every halfrevolution of tlie ccn-trolling motor. Thesealternations set thepace of as many ma-chines as it may be de-sired to place in cir-cuit. Very little cur-rent is used for tliispurpose, the batteryline on a one…
Mechanical engineering
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