. Appleton's dictionary of machines, mechanics, engine-work, and engineering. may beloin in a second ; and for this arrangement the contrate-wheel must have eight times the number ofteeth m the pinion ic turns—that is, 48 to 6, or 54 to 7. When the contrate-wheel is to be thus madeto turn 60 tunes m an hour instead of 72, (as in the ordinary train.) the number of teeth in the centre-wueci ana tnird-wheeL and the number of leaves in the pinions they turn, must be regulated accord- WATCHMAKING. 825 ingly. The usual plan is to give the centre-wheel 64 teeth, and to the pinion it turns 8 leaves ;

---

. Appleton's dictionary of machines, mechanics, engine-work, and engineering. may beloin in a second ; and for this arrangement the contrate-wheel must have eight times the number ofteeth m the pinion ic turns—that is, 48 to 6, or 54 to 7. When the contrate-wheel is to be thus madeto turn 60 tunes m an hour instead of 72, (as in the ordinary train.) the number of teeth in the centre-wueci ana tnird-wheeL and the number of leaves in the pinions they turn, must be regulated accord- WATCHMAKING. 825 ingly. The usual plan is to give the centre-wheel 64 teeth, and to the pinion it turns 8 leaves ; sothat this pinion, carrying with it the third-wheel, revolves eight times for each turn of the third-wheel, having 60 teeth, works into a pinion of 8 leaves; and this last, carrying the contrate-wheel, turns 7£ times for each revolution of the third-wheel. Hence the contrate-wheel turns (8X7-J)60 times for each revolution of the centre-wheel; and as the latter makes one revolution in an hour, sodoes the former complete one in each minute. 374fi.

---

Size: 1583px × 1578px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861