. The Street railway journal . the size of the heads so that the tendency ofthe plunger to assume a central position is balanced by the attrac-tion of the solenoid on the iron heads. With properly chosenheads the solenoid exerts no force whatever on the being the only force upon it, it will, of course, take up theposition shown. If now a piece of iron is placed over it, as shownin No. 3, the plunger may be raised by the attraction between thetwo. In case a very heavy plunger is used it is possible to sup-port part of its weight by merely increasing the size of the lowerhead by
. The Street railway journal . the size of the heads so that the tendency ofthe plunger to assume a central position is balanced by the attrac-tion of the solenoid on the iron heads. With properly chosenheads the solenoid exerts no force whatever on the being the only force upon it, it will, of course, take up theposition shown. If now a piece of iron is placed over it, as shownin No. 3, the plunger may be raised by the attraction between thetwo. In case a very heavy plunger is used it is possible to sup-port part of its weight by merely increasing the size of the lowerhead by a small amount. It is thus possible to construct a simplepiece of mechanism whose movement is entirely dependent uponthe presence of a mass of iron in its neighborhood, and whichcannot be moved by the solenoid itself, even though the magnet-izing current carries the iron up to the saturation limit. This hasbeen converted into the operating part of the switch. Though the force of attraction is sufficient to lift a fairly heavy.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
