548 
Mortice wheel, 376 
Motion and force, 15 e¢ seq. 
Motion, Newton’s laws of, 19 
Motion, simple harmonic, 296 
Mouthpiece, Borda’s, 460 
Mouthpiece, flow through cylindrical, 
458 
Multi-stage turbine pumps, 516 
Napierian logarithms, 4 
Nautical mile, 16 
Needle lubricator, 273 
Neutral axis, 104 
Neutral surface, 103 
Newton’s laws of motion, 19 
Nominal and actual stresses, 170 
Normal pitch, 381 
Notched bars, 174 
Notches, rectangular, 451 
Notches, triangular, 453 
N-truss, 231 
Obliquity of action between wheel 
teeth, 379 
Oil hardening, 182 
Oldham’s coupling, 408 
Open web girders, 231 et seg. 
Orifices, large rectangular, 450 
Orifices, partially submerged, 453 
Orifices, submerged, 449 
Oscillating engine mechanism, 308 
Otto cycle, 320 
Outward flow turbines, 493 
Overhead bracing, 247 
Overshot water wheels, 485 
Overstraining, hardening effect of, 
177 
Packing for hydraulic rams and pis- 
tons, 520 
Pad lubrication, 274 
Parabola, construction of, 10 
Parabola, equations to, 10 
Parallel flow turbines, 493 
Parallel forces, centre of, 44 
Parallelogram of forces, 34 
Path of approach, 379 
Path of contact, 378 
Path of recess, 379 
Pawl, 408 
Pelton wheel, 487 
Pendulum pump, 309 
Pendulum, revolving, 329 
Pendulum, simple, 299 
Pent roof truss, 198 (Ex. 5) 
Periodic time, 297 
Permanent set, 66 
Pheenix column, 61 (Ex. 8) 
Piezometers, 464 
Pin wheels, 382 
Piston, 499 
Piston acceleration, 301 
Piston acceleration diagrams, 303 
APPLIED MECHANICS 
Piston effort diagrams, 313 
Piston velocity diagrams, 300 
Pit work, 293 ° 
Pitch circle, 3875 
Pitch line of toothed wheel, 375 
Pitch of teeth, 375 
Pitch surfaces of toothed wheels, 
Pivot, Schiele’s, 267 
Pivots, friction of, 265 
Plane motion, 15 ae 
Plate girder, worked example, 223 — 
Plate girders, 214 et seq. "ae 
Plate girders, riveting “of, 220. - Sm 
Plate girders, weight of, 223 
Plunger, 499 
Plunger pump, 501 
Pneumatics, 1, 431 
Poisson’s ratio, 155 
Polygon, funicular, 36, 38 
Polygon of forces, 35 
Polygon, vector, 13 
Poncelet water wheel, 487 
Porter governor, 334 
Positive and negative bendiem an 
shearing, 88 
Potential energy, 30, 439 
Pound, 18 
Power of governors, 338 
Power transmitted by belts, 369 
Power transmitted by wire ropes, 
Power transmitted through a pipe, 
Pratt truss, 231 
Pressure, centre of, 47, 433 
Pressure energy, 439 
Pressure, resultant of, 433 : 
Principal axes of inertia, 56, 58 
Principal axes of stress, 141 
Principal stresses, 141 a 
Principal stresses due to combined 
bending and twisting, 143 . 
Principle of moments, 44 
Prony brake, 347 
Proof load, 68 
Proof strength, 68 
Proof stress, 68 
Proportions of teeth, 376 ” 
Pullen’s friction brake dynamomet : 
350 s 
Pulleys, stepped, 364 
Pump, pendulum, 309 
Pump valves, 506 
Pumps, 499 ¢¢ seg. 
Purlins, 201 
Quadratic equations, 2 
Queen-rod, 202 
Quick return motion, Whitworth, ; 
Rack, 382 
Radian, 16 
Radiating current, 442° 
Radius of curvature, 9 
Radius of curvature of beam, 103 
