Professional Papers of the Signal Service Volume 1

Professional Papers of the Signal Service Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 edition. Excerpt: ...top of the start', is wound on a drum about (5 inches in length and 4 inches in diameter, having a handle at one end. Upon one end of this drum is a wooden wheel 15 or 20 iuches in diameter, upon which a friction brake plays. By a simple piece of apparatus this brake is automatically applied by the ball itself in its descent, when it is within 5 or 0 feet of the bottom, and arrests it easily and without any sudden concussion. In case the ball is made of tin strips it can readily be stopped by means of air cushions. 5. The mast should, in all cases, pass through the center of the ball. Otherwise there is no method of controlling the ball in its descent. G. The following device for detaining the ball at the top of the mast and releasing it at the instant of noon, is the arrangement of Mr. William P. Gardner. It is simple and not liable to get out of order, and acts without loss of time, and has been found by experience to work as well as anything yet suggested. I have had already four or five of these machines made to order, and having the drawings and castings already prepared, can have them made quite cheaply. The machinery is simple and easily understood from the figure, and answers every purpose. It is mounted in a box about two feet high and fifteen inches wide, which is firmly secured to a table beneath. The cut shows it as it stands ready for dropping the ball, which is drawn up to the top of the staff five minutes before noon. The ropes (ii) which hold the ball in place are shown in the figure passing through a ring (G). The bolt which holds this ring is a continuation of the perpendicular piece (L). This is being constantly pressed back toward the right by a strong spring concealed under (H), and is only kept from flying back by...show more

Product details

  • Paperback | 92 pages
  • 189 x 246 x 5mm | 181g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236759915
  • 9781236759917