. The street railway review . stive and extended trials will be awaited withinterest. The two objections—and there are only two—to trolleyclamps have always been: That they will not hold thetrolley wire as well as a soldered ear, and that when they dohave any strength they have to encircle the wire almostcompletely, thereby causing the trolley wheel to jump andconsequently arc. With these two objections constantlyin mind, the makers of the Hercules trolley clamp setto work to make a trolley clamp that could be guaranteedto have as strong a hold on the wire as a soldered earand yet not enclose
. The street railway review . stive and extended trials will be awaited withinterest. The two objections—and there are only two—to trolleyclamps have always been: That they will not hold thetrolley wire as well as a soldered ear, and that when they dohave any strength they have to encircle the wire almostcompletely, thereby causing the trolley wheel to jump andconsequently arc. With these two objections constantlyin mind, the makers of the Hercules trolley clamp setto work to make a trolley clamp that could be guaranteedto have as strong a hold on the wire as a soldered earand yet not enclose at any point of its entire length butlittle more than half the trolley wire. As the result oftheir labor they now offer the Hercules trolley consists of but three pieces, two of which grip thewire, and the third, namely, the nut, holds the others inengagement and also fastens it to the insulator. As thethreaded shank is all one piece, it is readily seen thatonce the nut is screwed down to bear on the loose piece,. that the pressure on the nut is all on one side, which con-sequently locks the nut, and the clamp can not be jarredloose. When it is desired to adjust the clamp, it is notnecessary to take the nut completely off, but simplyunscrew it for three or four turns, when the clamp canbe moved to the required point and refastened. A testwas made recently by Robert W. Hunt & Co., ofChicago, on a Hercules trolley clamp and a 15-inchsoldered ear. The Hercules clamp was subjected toa strain of 1000 pounds without being injured in any waywhatsoever, while the soldered ear was distorted whensubjected to a strain of only 500 pounds so that it couldnever be used again, and with an additional 180 poundsbegan to let go of the, wire. In view of this test themakers of the Hercules clamp are certainly on thesafe side when they guarantee their clamp to be as strongas a soldered ear. Gustin & Co., 84 Market street,Chicago, are at present making this clamp only forrigid hangers,
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