A Rudimentary Treatise on Clocks and Watches and Bells

A Rudimentary Treatise on Clocks and Watches and Bells

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ... 8. To have the improved bolt and shutter maintaining power (p. 151) or the Wesminster one for a very large clock The going part to go a little over eight days. 9. The striking parts to be wound up every one or two days, except in small clocks or they will never strike efficiently. All the striking to be done by steel-faced cams on the great wheels. The 4th quarter bell to have two hammers (see p. 188). In smaller clocks cast-iron cams will do. 10. The hour striking to be let off independently of the quarters, and the first blow to be struck exactly at the hour, the hammer being left on the lift: the other quarters to begin exactly at 5, 30, and 45 minutes. 11. The hour hammer to be not less than a 60th of the weight of the bell, and to be raised not less than 9 inches; the quarter hammers to increase in weight upwards from a 60th to a 40th of the weight of their bells, and all the hammers to be raised enough to bring the full tone out of the bells: small ones at least 6in., and the hour one at least 9. 12. There must be either levers or eccentrics to lift the hammer levers completely off the cams, when the bells are ringing, if there is a peal. 13. The small wheels of the going part to be of brass or hard gun-metal, driving lantern pinions. All the larger wheels and the pinions driven by them may be of cast iron, and their being of brass or gun-metal will be considered no reason for a higher price. All bushes to be brass or gun-metal. The large pivots to be case-hardened, the smaller ones and their arbors to be of steel. The pulleys to be large and pivotted in brass bushes. 14. The barrels of sheet iron brazed, with iron or steel wire ropes not coated with zinc which makes them crack, and the pulleys to be so placed that the ropes do not grind, ..show more

Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236632729
  • 9781236632722