APPENDIX 



Wave-length 



Ultraviolet radiation 0-39001;^ 



Extreme region 0-200 



Gamma rays (arbitrary limits) o to o.oimju 

 Rontgen rays (arbitrary limits) o.oi to ^om/j. 



Middle or intermediate region 200-300 



Near region 300-390 



Visible radiation 390-77omM 



Violet 390-430 



Blue 430-470 



Blue-green 470-500 



Green 500-530 



Yellow-green 530-560 



Yellow 560-590 



Orange 590-620 



Red 620-770 



Infra-red radiation 0.77-co fi 



Near region O'V?"" ^o 



Infra-red photography to ifi 

 Fluorite prism to lo/x 

 Rock salt prism to 2om 



Intermediate region 20-500 



Selective reflection from rock salt to 50/u 

 Selective reflection from potassium chloride to 6l/x 

 "Restrallen" method up to 354M 

 Electric oscillator method up to 500M 



Extreme region 500-00 



Electric waves such as that radiant energy studied by Herz, 

 that used in wireless electric circuits, that resulting from high 

 frequency currents, and that due to ordinary alternating 

 currents complete a long range of wave-lengths to beyond 

 12 km. in wave-length. 



The More Acctu-ate Eqtiivalents Used for Exacting Computations. 



I cubic inch of water = 251.889 grains 



I inch = 25.4001 miUimeters 



3600 



I yard = meter 



3937 



I U. S. wine gallon = 3785.33 cubic centimeters or 



3785.33 grams of pure water 



I meter = 39.370432 inches 



I fluid ounce = 29.5737 cubic centimeters 



I liter = 33.8 14 fluid ounces 



I pint (O.) = 473.179 cubic centimeters 



I milliliter (cc.) = 16.23 minims 



I gram = 15.43235639 grains 



I grain = 64.7989 milligrams 



I apothecary ounce = 31.1035 grams 



I ounce (av.) = 28.35 grams 



I pound (lb.) = 453.592 grams 



I kilogram (Kg.) = 2.20462 pounds 



546 



