. Electroplating; a treatise for the beginner and for the most experienced electroplater. asily managed. The best form of dynamo for the use of the electro- 26 THE ELECTRICAL EQUIPMENT plater is some sort of shunt-wound or compound-woundmachine, giving a large volume of current at low pressure,the current being delivered constantly and in one the shunt-wound dynamo, there is automatically a con-tinuous balancing of the current as the load varies in theexternal circuit. The compound-wound machine, however,can also be designed to give a constant current, and has, inaddition, self-re
. Electroplating; a treatise for the beginner and for the most experienced electroplater. asily managed. The best form of dynamo for the use of the electro- 26 THE ELECTRICAL EQUIPMENT plater is some sort of shunt-wound or compound-woundmachine, giving a large volume of current at low pressure,the current being delivered constantly and in one the shunt-wound dynamo, there is automatically a con-tinuous balancing of the current as the load varies in theexternal circuit. The compound-wound machine, however,can also be designed to give a constant current, and has, inaddition, self-regulating features not possessed by theshunt-wound machine. It is the best type of machine touse for electroplating. Such a generator is shown in Machines for electric lighting work are designed togive a moderate volume of current at high pressure, andwhile a plating dynamo will generate current at, say, 10volts, the lighting current may have a pressure of no or220 volts, or higher. The unfitness of the lighting currentfor the purposes of the electroplater is therefore 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
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