INDEX TO VOL. I. 



607 



Plucker, 585 

 Poinsot, 248, 250 



Poinsot's Theory of Rotation, Instrument to illus- 

 trate, 246 

 Poisson, 30, 32, 72 



Polyhedron, inscribed in a surface, 94, 98, 99 

 Pressures, Equations of, 37 

 Problems, Solutions of, 74 



Ray, Reduced path of, 280 



Reciprocal Figures, 514; Application^ to Statics, 

 522 ; Possibility of drawing, 516 ; Relation 

 between the number of points lines and polygons 

 in, 515 



Refraction, index of, how related to specific in- 

 ductive capacity, 583 



Regnault, 33, 71 



Resistance, Electric, how related to transparency, 

 586 



Resisting medium, descent of a heavy body in, 115 



Rigid body, Stability of the steady motion about a 

 fixed centre of force, 374 ; motion of about a 

 sphere, 296 



Ring : motion of, when rigid, about a sphere, 296 

 310 ; motion of, when the parts are not rigidly 

 connected, 310; of equal satellites, 360 



Rings, Effect of long continued disturbances on a 

 system of, 352; mutual perturbations of two, 

 345 ; Fluid, Loss of energy due to friction, 354 



Rolling Curves, 4 ; Examples of, 2229 



Rolling of Curves on themselves, 19 



Rotation, Theory of, 249 



Saturn's Rings, Stability of, 286, 288376 



Sources and sinks denned, 163 



Spectrum, Relation of the Colours of, to Compound 



Colours, 410 

 Sphere, hollow, dilated by heat, 64 ; exposed to 



pressures, 51 55 

 Sphere: magnecrystallic, 217 ; magnetic in uniform 



field of magnetic force, 212 



Spherical shell: Electromagnetic, 220, 222; Per- 

 manent magnetism in, 220 ; Revolving in 

 magnetic field, 226 



Spherical electromagnetic coil machine, 224 



Spheres perfectly elastic : Motions and Collisions of, 

 378 ; Boyle's law, 389; Mean distance between 

 collisions, 386 ; Mean Velocity, 381 ; Mean Velo- 

 city-square, 381 ; Two systems in same vessel, 

 383 



Spheres: Two, between poles of a magnet, 216; 

 Two, in uniform magnetic field, 215 



Stokes, 32, 33, 71, 72, 143, 209, 391, 410 



Struve, 292 



Surfaces: Applicability of, 95; Conjugate systems 

 of curves on, 95, 96 ; Transformation of, by 

 bending, 80 



Telescopes, perfect, 275 279 



Thomson, Sir W., 157, 196, 199, 209, 212, 374, 

 453, 503, 505, 528, 529, 533, 588 



Top, Dynamical, 248 ; Instantaneous axis, 255 ; 

 Invariable axis, 252 255 ; Method of observ- 

 ing the motion, 257 



Tractory of a curve, 13 



Tractory of circle, 15, 17 



Tubes, unit, 161 



Unit, Electrostatic and Electromagnetic, 569 



Verdet, 504, 506, 507, 513, 529 



Vortices, molecular : Applied to Electric Currents, 



467 ; Applied to Magnetic phenomena, 451 ; 



Applied to Statical Electricity, 489 



Wave length, Method of determining, 423 



Weber, 208, 492, 499, 507, 527, 535, 545, 569, 



579 



Wheatstone, 434 

 Wilson, Dr George, 137, 415 



Young, 32, 60, 124, 136, 137, 412, 419, 447 



CAMBRIDGE : PRINTED BY C. J. CLAY, M.A. AND SONS, AT THE UNIVERSITY PRESS. 



