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The New Technical Educator Volume 3; An Encyclopaedia of Technical Education

The New Technical Educator Volume 3; An Encyclopaedia of Technical Education


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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. 1894 Excerpt: ... bend in the reverse direction to that in which the pendulum is travelling, when the impulse is communicated tothe rod through the fork or crutch. Pendulum Coch.--Another point of the most vital importance to the good performance of a clock, and one that is not always carefully attended to, is the manner of fixing the pendulum cock or bracket. In turret clocks with a heavy pendulum bob this should either be built into the wall opposite the clock, or bolted through it in a very firm manner, as if this is not carefully attended to, the centrifugal force of the bob will cause a slight rocking motion of the bracket to take place, and, however small the arc, a slight falling off in the extent of the vibrations will be observable. If the spring be not securely fastened at the end tothe cock or bracket, the same effect will of course take place. The pendulum cock of a regulator should be securely bolted to the back of the case, which should not rest on the ground, but be fixed to a permanent wall of the room, and the back should be suitably substantial--not less than 1 inches in thickness. Pendulum Bobs.--Various-shaped bobs have been from time to time devised, the most common in all the old clocks being the lenticular or lensshaped, which has been recommended by Reid and others. If exactly made this would not be a bad form for the bob, but it is a very difficult one to form accurately, one of the convex sides being invariably more protuberant than the other; or if these are properly divided, there is another difficulty in getting the hole exactly in the middle of them. Any inequality of this kind will cause the pendulum to have a twist at every swing, and prevent the good going of the clock; for this reason pendulums are now nearly always made with cylindricalBha...


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Product Details
  • ISBN-13: 9781232158004
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 236
  • Spine Width: 13 mm
  • Width: 189 mm
  • ISBN-10: 1232158003
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 426 gr


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