. Electric railway gazette . he contactin the off position when the car has passed. This iseffected^ by the latch shown immediately under thearmature, Fig. 5. The latch is rigidly fastened to a thinplate of iron at right angles thereto and is pivoted on theedge of the armature proper at the point of this action of the attracting magnet is simply to lift this plate and thus move the latch to the right, thereby releas-ing the frame which, when tilted, closes the switch. Whentilted back by the rear magnet the latch locks by gravity. Recently it has been proposed to use the double latchs
. Electric railway gazette . he contactin the off position when the car has passed. This iseffected^ by the latch shown immediately under thearmature, Fig. 5. The latch is rigidly fastened to a thinplate of iron at right angles thereto and is pivoted on theedge of the armature proper at the point of this action of the attracting magnet is simply to lift this plate and thus move the latch to the right, thereby releas-ing the frame which, when tilted, closes the switch. Whentilted back by the rear magnet the latch locks by gravity. Recently it has been proposed to use the double latchshown in Fig. 7, This arrangement merely involves theuse of the latching device on both armatures, and itfirmly locks the contact in both positions. Nothing but a magnet can operate the device from theoutside. It may be asked: How can the magnet be oper-ative through the heavy cover ? This difficulty has beeningeniously met by the use of a special alloy. The ribbedcover contains 60 per cent, of iron, and yet its magnetic con-. F1G. 6—SWITCH CONTACT. -PROPOSED DOUBLELATCH. tinuity seems to be thoroughly broken by means of theother components, and the leakage through it is boxes are sealed with an asphaltic compound andare entirely water tight. In addition, the hollow pedestalof the contact device, which contains the contact, isthoroughly sealed at its base in the interior of the , in order to reach the contact, moisture must pene-trate two most carefully made joints. Fig. 4 shows theappearance of the moving parts in their enclosure. The experimental track is U-shaped, and contains anextremely sharp curve. It has been fenced in, so that it
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
