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72 RICHARDSON'S BLUEBOOK OF PROJECTION
generator just as if the connection between the two machines were broken. There is this peculiarity: (38) if power-consuming devices are attached between either outside wire and the neutral wire, they will operate normally under 110 volts pressure. If the devices on either side of the neutral have equal capacity — use exactly the same amount of current — then they will work in series under 220 volts pressure and no current will flow either to or from the generators on the neutral wire.
(39) On the other hand, if the load on either side of the neutral wire is unequal, then the amount of the unbalanced load will flow back to or out from the generator on the "heavy" side, the direction of the flow depending upon whether the neutral is negative or positive to the generator connected to the "heavy" load.
(40) In Fig. 17 are three lamps, each using 0.5 of an ampere, connected between the upper outside wire and the neutral. Two lamps, each using 0.5 of an ampere, are connected between the lower outside wire and the neutral. We thus have a load balance of one ampere, with 0.5 of an ampere over. The surplus must therefore flow back to the upper generator over the neutral because it is negative to that generator. Under the newer interpretation it flows out, since we now consider current as flowing from negative to positive instead of from positive to negative.
G and H are 110 volt voltmeters. 220 volt voltmeter I measures the voltage between the two outside wires. (41) The outside wires are known as the "true negative" and "true positive." (42) The effect of an unbalanced load is to force the one generator to carry more than the other. The intention of course is to have a perfectly balanced load at all times though it is seldom attained. (43) Were it possible always to maintain an exactly balanced load there would be no need for a fuse on the neutral wire, since it would carry no current at all between the last piece of equipment and the generators.
(44) Power companies object to both projectors being connected to one side of a 3-wire system because that