rOLTTECHNIC AsSOUIATIOy PrOCEEI>XNG3. 805 



The strike main wheel is also three feet in diameter; has one hun- 

 dred and sixty teeth, and thirty-two pins, with tempered steel rollers 

 for lifting the hammer. The second wheel is twenty-seven inches, 

 has two hundred and seventy teeth, and turns once to three strokes 

 of the hammer. It has three pins in its face, and a pawl, that drops 

 by its own weight, is attached to the frame, to prevent its going 

 back while winding, as the pins always stop in the same relative 

 position. A collet, in which is placed three gathering pins, is put 

 on the second arbor, to bring in the rack while striking. The third 

 arbor has a locking bar atta,ched, and also runs through the frame, 

 and has the fly of four fans on the outside. The lifting arm, ope- 

 rated by the pin, unlocks the train and holds it until the moment 

 of striking; it also unlocks the rack which drops into position 

 against the snail. When the train is let loose, it runs until the 

 rack is drawn in, when it locks until the next hour. One blow is 

 struck to ev^r}^ tooth of the rack drawn in, while the snail allows 

 as many to pass out as there are hours to be struck. Both barrels 

 are twenty inches in diameter, and grooved to receive a wire rope 

 three-eighths of an inch in diameter. The train wheels are of brass, 

 and pinions of steel, engine cut. All the teeth are rounded at the 

 bottoms and finely finished. The w^iuding wheels are of iron, thirty 

 inches diameter, and are driven by a pinion and arbor and crank. 

 It takes about twenty minutes to wind. The time weight is three 

 hundred pounds. Power exerted on movement, one hundred; 

 striking weight, seven hundred and Mty pounds; direct weight, one 

 hundred and fifty pounds. The weights drop forty feet. The 

 clock stands in the south tower, twenty-five feet below the dials. 

 A bevel wheel is put on the second arbor, with ninety teeth, driv- 

 ing another of one hundred and twenty teeth, on a vertical rod 

 that runs as du'ect as may be to a point in the center of the tower, 

 and on a level with the center of the dials. Here stands an iron 

 frame, in the center of which, and connecting with the vertical rod, 

 is another bevel wheel with one hundred and twenty teeth, and 

 around, three bevel wheels, each of ninety teeth, from which rods 

 run to the several dial works. Some one may ask, " Why use 

 bevel wheels of <lifferent numbers?" It would make no difierence, 

 until we come to branching ofi" from the center to the dials. We 

 cannot surround one bevel wheel with four others of the same 

 uumbei's, f^r they would all mesh into each other. The starting 

 point usually turns once in an hour, so we slow the train to this 

 point, and then bring it up again. These rods are fitted with ball 



