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Applied Mechanical Arithmetic as Practised on the Comptometer

Applied Mechanical Arithmetic as Practised on the Comptometer


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About the Book

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. 1914 Excerpt: ...What is the Maximum Bending Moment in inch pounds, at point of support? W 1 PlH--g-2 in which P = Load in lbs. 1 = Length of span in inches. W = Total weight of Beam in lbs. A 12 column Comptometer will woik this out to the last decimal. Formula: (8600 X 220.5) + (55 X X 220.5)-i-2) wt. inches lgth. wt. per ft. Ig1h. inches lgth. ) Maximum Bending Moment in inch pounds at point of support. METHOD The last statement should be figured first; then, with the Fixed Decimal Method, accumulate the product of the first. MATERIALS Commence at the right of Keyboard. Hold 220.5 for the Key Factor and multiply 18.375, equals 4051.6875 Leave this in the machine and multiply by onehalf of 55 or 27.5. (Or multiply by 55 and divide result by 2.) Use "Three Factor Method "(p. 39) = 111,421.40625 Leave result in the machine. Use the decimal, where located, as a Fixed Decimal, and multiply the weight by the length in inches, = 2,007,721.40625, Bending Moment in Inch Pounds. Find the transverse strength of flagging (flooring). Example: (From Kent's "Mechanical Engineer's Pocket Book.") Bluestone Flagging, 72" wide X 8" thick, resting on 36" centers, 32" in the clear. What is the breaking load? Formula: Width X Square of thickness Span in clear. X 'Breaking Load at center of span. METHOD Square the thickness, 8, on the right side of Keyboard 64 Leave this in the machine and multiply by 72 ("Three Factor Method," p. 39)...4608 Then continue and multiply by.744, (" Three Factor Method ") 3428.352 Leave this result in the machine and divide by 32 107.136 Net Tons, Breaking Load. The final result is obtained without clearing the machine or jotting down any intermediate result..744 is the percentage of strength Bluestone su...


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Product Details
  • ISBN-13: 9781130196788
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 118
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 113019678X
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 227 gr


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