Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

726 INDEX. PAGE Hollow Columns .. ..113 Hoop Iron................38 Horizon, Dip of.......... 8 ----—- Distance of .. 8 Horse-power ............485 ------------French .. 486 —-----------of Water- wheels -----529 ------------of Windmills 547 ------------on Canals 270 Horses, Tractive Power of 241 Hot Water, Warming by 3’4 Houses, Thickness of Walls in ..............91 Hydraulic Machinery .. 543 ---------Memö/anda .. 243 ---------Piles .. ..120 --------— Press .. .. 543 ---------Ram .. .. 541 ---------Riveting .. .. 543 Hydraulics, Delivery in Pipes ................253 -------— Discharge frotn Orific 8..............244 ---------Force of Water in Motion ............251 --------- Horizontal Jets 248 =--------in open Chan- nels ----269 ------------------in Rivers.. •. 267 --------— Machinery .. 543 --Mean and Sur- face Velocity.. .. .. 264 ---------Oblique Jets .. 249 ------------•-over Sills .. 251 ---------Resistance of Bends .............. 262 --------— Theoretical Velocity............; 245 ■--------—■■-----Useful Memo- randa .. .. .. .. 343 ---------Vertical Jets .. 250 Hyperbola...............615 Hyperbolic Logarithms .. 689 FACTS Harding's Formula .. .. 222 Hawksley’s Formula for Pipes ..................253 Heads of Rivets .. .. 483 Heat, Conducting Power of 375 —------ Expansion of Sub- stances with............375 —--Mechanical Equi- valent of...............453 — -— Melting of Sub- stances ............ ..375 •----Radiation of .. .. 373 -----Specific...........375 Heating Surface, Relative Value of................. 462 Heights, Barometric .. 12 -----------------Table of 13 •----— Measurement of 5 i ----------------------of, without instrument ..---6 --------------------of, with Sextant--------- 7 --------------------of, with Thermometer .. 10 Helical Springs.........231 Helices, Length of .. .. 657 Hemp Rope Gearing .. 416 ---------Weight and Strength of.................52 • Working Loads of............ .. 52 Hexagon.................659 --------Bolts and Nuts 418 High-pressure Engines .. 489 -------------Engines, Nominal H.P. of .. .. 485 •------------Engines, Portable ............. 489 ——-----------Kngin s, Proportions of .. .. 498 -------------Engines; Vertical-----489 Hodgkinson’s Formula for Columns..................Ill ,