682 



INDEX 



PAGE 



Woods, densities 132-135. l6l > l6 3 



mechanical properties, conifers, 



common units . . 135 



metric " .. 133 

 hardwoods, 



common units • . 134 

 metric " ..132 



Work, conversion factors 251 



definition 66 ° 



function, electron emission 547 



X (Rontgen) rays: absorption 543. 544 



coefficients (mass).. 545 

 limits, critical. 538-541 



lines 538 



cathode rays 536-537 



characteristic 537 _ 538 



efficiency of pro- 

 duction 542 



chemical combination, effect of. 544 



continuous spectrum 537 



critical absorption limits. .538-541 



crystals, lattice constants 543 



efficiency in production of char- 

 acteristic 542 



emission 537 



energy in continuous spectrum. 537 

 relations 543 



PAGE 



X (Rontgen) rays: fluorescence 543 



K group 538-540 



L group 538-540 



lattice constants, crystals 543 



M group 541 



mass absorption coefficient, 



v-lp 545 



A/p 545 



photographic effects 546 



scattering 544 



spectroscopy of 543 



Year: anomalistic 601 



light 601 



sidereal 60 1 



tropical 60 1 



Yearly means: magnetic character 595 



solar constants 609-610 



sun spots 610 



temperature 556 



Yield point, mechanical property no et sea.. 



Young's modulus, mechanical property no et seq. 



Zeeman displacement 106 



effect (I. C. T., 5, 418) 503 



Zero, absolute, — 273. ° 18 C 85-86 



Zinc, mechanical properties 124, 125 



Zonal spherical harmonics 66, 67 



