. Electroplating; a treatise for the beginner and for the most experienced electroplater. Fig. 78 Compound-Wound Dynamo THE ELECTRICAL EQUIPMENT 27 In purchasing a dynamo, avoid all offers of second-handmachines, although warranted as good as new. Get asmall machine of a responsible dealer, at a cost of $50 orupwards, and then master its construction and working soas to get the best results. It may be set down as a law inelectrical engineering, though probably never beforeprinted, that a dynamo will deteriorate and go to scrapwith a velocity equal to the square of the ignorance of theoperator.
. Electroplating; a treatise for the beginner and for the most experienced electroplater. Fig. 78 Compound-Wound Dynamo THE ELECTRICAL EQUIPMENT 27 In purchasing a dynamo, avoid all offers of second-handmachines, although warranted as good as new. Get asmall machine of a responsible dealer, at a cost of $50 orupwards, and then master its construction and working soas to get the best results. It may be set down as a law inelectrical engineering, though probably never beforeprinted, that a dynamo will deteriorate and go to scrapwith a velocity equal to the square of the ignorance of theoperator. REGULATING AND MEASURING INSTRUMENTS A rheostat, to enable the plater to control the current,is necessary where a dynamo or large battery is used. Onestyle of rheostat is showTn in Fig. 8. Throwing aside tech-nical terms, the rheostat is similar to a tap or valve in a. Fier- 8. Rheostat 28 THE ELECTRICAL EQUIPMENT water pipe, each wire taken in by it acting like the plugof a tap narrowing the orifice through which the liquidflows. The ammeter, Fig. 9, measures the rate of flow of cur-rent, in amperes, and is sometimes made in connectionwith the voltmeter. As 1 ampere of current, under properconditions, will deposit in 1 hour gr. of silver, copper (from cuprous solutions), or gr. of gold(from aurous solutions), it is evident that the plater shouldregulate his current according to the work in hand. The voltmeter is similar to the ammeter, but measuresthe pressure of the current in volts. In Fig. 10 is shown
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectroplating, booky
