Weighing and Measurement Volume 6-7

Weighing and Measurement Volume 6-7

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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. 1919 edition. Excerpt: ...A close study will reveal that this design includes well accepted principles essential to an accurate and durable beam and the difierence in appearance from the conventional tyne of beam is due to a consistent use of these principles. It is of cast iron with cross section of inverted U shape. This shape, besides giving the maximum rigidity. furnishes a housing over the balance ball and track for carrying poise. The notches are cut in a steel bar inserted in the bottom of the back web, which insures that no dirt can fall and lodge in them. The type for printing weights on tickets is fastened on the bottom of the front web. The center indicating poise suspended from three ball bearing trolley wheels runs smoothly upon a machined track housed inside the beam. Its exact weighing position is determined by a positive locking device of thirty or more teeth engaging the same number of notches of the beam. This locking device or pawl moves in vertical guides arranged-to be always tight, to insure a nnsitive position of the poise. A convenient handle on the front of the poise serves to operate the pawl when turned in one direction and to print the tickets when turned in the other direction. The beam stand is of the upright pillar woe with compensating steel hearing blocks machined in. For both light and heavy service scales all parts are designed so that when loaded to rated capacity the stresses developed will not exceed those in the following table: ' ("ask Steel Macliin-Struct.'n'ure of lron Fast ery.ural Stress ings Steel Steel Tension........ I500 8000 8000 10000 ('ompressinn...8000 10000 8000 10000 Transverse Bending Tension..2S00 8000 8000 10000 ('umpression..8000 M000 8000 l0000 Shear.....2500 t000 5000 7000...show more

Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236865618
  • 9781236865618