Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 100
l testing, it is usualto arrange the standard setsof resistances in boxes, andthe variety of ways in whichthis is done is very great. Onevery common arrangement isshown in Fig. 85. The Avirewhose resistance is approxi-mately that required, is sol-dered one end to each of thebrass blocks, which are… … Fig. 87. melted paraffin wax. Ihe plugs are ground to fit into conical holesbetween the brass blocks, so that on inserting any given plug thecorresponding resistance coil is short circuited. 90 ELECTRICITY AND MAGNETISM CHAP. Eig. 86 is a box of the ordinary type made by Mr. R. W. Paul, andFig. 87…
Electricity · Magnetism
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