of revolving in a confined socket, These sheaves are manufactured ty Messrs. New- and work awkwardly if he is continually changing one for another. The weight can be added to or taken moving the length of the slot in the same time that Fig. 2. the wheel travels the length of the track. By this… … SLIDING-DOOR ROLLER SHEAVES. New York. The invention was patented May 5, 1863, The length of the slotis dependent upon the dis- from at will by simply increasing the dimensions of the tance the door is required to travel; also upon the relation between the circumference of the wheel and addressing…
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