TELPHERAGE 



261 



the spring transmitted by the discs A and B. By tightening 

 the spring, any required grip can be obtained with no injurious 

 friction, either on the cross shaft or on the spindles of the rollers. 

 This grip is a form of right angle nest gearing. The weight of 

 the locomotive was taken by wheels, C C, fore and aft. The 

 following defects were observed : The frictional surfaces, both 

 in the upper and lower nests, were too small, and the materials 

 too soft, so that rapid wearing resulted with a consequent in- 

 crease of friction. Moreover, the grip was so powerful, that the 

 rollers, A A, were capable of supporting the weight, and thus a 

 small inclination of their vertical axis was enough to cause the 



rttCTRO MOTOR 



FIG. 10. 



locomotive to rise and even run off the line ; moreover, the 

 vertical curvature in the rope, or at the posts, required the 

 rollers, A A, to be deep, thus limiting the extent to which rocking 

 was admissible; moreover, very broad pulleys, fore and aft, 

 would be required even for moderate horizontal curves. Never- 

 theless this locomotive ran sufficiently well on the 1-inch line 

 during an exhibition to the shareholders last autumn. The weight 

 for a five-eighth-inch line of a somewhat improved form of this 

 type, to exert one-half horse-power, on the average, is 200 Ibs. ; 

 an extra half-hundredweight would give one horse-power. The 

 driving wheels, A A, of this example are 6^ inches diameter. 

 The motor makes 9-23 revolutions for one of the driving wheels. 



