Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

3 i o OK ENGINEERING FOBMULÆ. Heat. Conducting power of substances, slate being 1000. Slate Lead . ■ .. .. Flagstone .. .. Portland stone .. Biick PROI’F 1000 6210 1110 750 600 XI 730 MIES O Fire-brick .. .. Chalk .. .. Asphalte .. .. Oak Lath and plaster . Cement.. •. > * F Metals, &c. 620 564 451 336 255 200 Specific Heat. Con- ducting Power. Expauaion between 32° and 212° F. Melting Point, Fah. Water at 39°, being 1,00 — •04775 32 Antimony .. .. •0507 —— •0011 810 Bismuth •0288 —« • 001-4 495 Brass —— —• •002 1834 Copper Gold •095 898 •0018 1S50 •0298 10U0 •0016 2100 Iron, cast .. .. —• •0011 2786 „ wrought .. •113 347 •0012 — Lead •0293 180 *0028 612 Mercury.. .. .. •033 •018153 -38£ Platinum .. .. >—■ •0009 3080 Silver •0557 973 •0019 1873 •0514 304 •0021 4-12 Zinc •0927 363 •0029 736 Thekmometeb. To convert degrees, Centigrade or Reaumur, into degrees Fahrenheit. , „ 3 Let F = No. of degrees Fahrenheit. C = „ >> Centigrade. K = „ » Reaumur. an 9 R F — — + 32. F = —- + 32 = c + R + 32 5 4 5 (F -32) __ __ 4 (F — 32) C- 9 * ' 9 Freezing point, or 32° Fab. = Zero in Cent., or Reaumur. Boiling point, or 212° Fah. = 100° Cent., or 80° Reaumur. _____________________________________________________________.......