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44 RICHARDSON'S BLUEBOOK OF PROJECTION
The parallel connection permits all rheostats to deliver to the arc their full normal amperage capacity, but the voltage is neither raised or lowered in any degree. (51) If each rheostat has a voltage capacity not less than that of the circuit supplying it, two or more rheostats of unequal amperage capacity may be connected either in parallel or series. If the combined resistance of two rheostats is sufficient to oppose the line voltage without < werloading the coils or grids, then two or more rheostats of unequal voltage capacity may be connected in series.
Any number of rheostats of different type, but each of voltage capacity at least equal to that of the supply circuit, may be connected either in series or parallel. For example, a 15 ampere, a 25 ampere and a 50 ampere 110 volt, or a 15 ampere 110 volt, a 25 ampere 220 volt and a 50 ampere 110 volt rheostat may be connected in parallel (multiple) on a 110 volt supply circuit. The current delivered would equal the total capacity of all the rheostats thus connected, but the 220 volt rheostat would deliver approximately but half the current it would when working on 220 volt lines. The three 110 volt rheostats would deliver 15 plus 25 plus 50 amperes. A 220 volt rheostat may be used on 100 volts (but a 110 volt rheostat may not be connected to a 220 volt circuit) though the amperage delivery would be very small. In the first case the amperage would be far less than the capacity of the instrument. In the second case the resistance element would quickly burn itself out.
A. C. and D. C. Rheostats
(52) No rheostat made today is specifically either a. c. or d. c. Any rheostat of proper voltage capacity may be used either on a d. c. or an a. c. circuit. (53) The only difference is that a wire coil rheostat will deliver a little more current on d. c. than on a. c. because on a. c. the coils set up an inductive effect commonly termed "magnetic kick," which adds to the total resistance.