APPENDICES 



151 



Inches and Millimetres. 



5000 lines per inch = 197 lines per mm. 



10000 „ „ = 394 lines 



30000 „ „ = ri8i 



50000 „ „ = 1-968 



2539977 lines in an inch 

 50799 



101599 

 152399 

 203198 

 253998 



I line to the ju. 

 2 



4 



6 



5 0 0 0 

 _ 1 



1 oiro 0 



1 



20000 



1 



5 0 0 0 0 



^th of an inch = 



= 10 



5-08 fi. 



2-54 . 



1-27 „ 



•508 „ 



•363 » 



•254 „ 



7TT0 0 0 » >> 

 1 



10 0 0 0 0 " " 



Square ^ inch = 10-08045 squaie millimetres. 



,. ^\ „ = 6-45148 



„ „ - 4-48021 



)) TTO" 5) ~ 06451 )5 JJ 



Square fx. = -00x55 square ywit i^^ch. 



10 |u. = -1550 



100 ju. = 15-5003 



. Multiples of the above may be found by multiplying the values given by the square of the 

 multiplier. Thus, square yV inch = ^\ x 4; the square of 4 = 4 X 4 = 16, and 6-45148 x 16 = 

 103-22368 square millimetres (Carpenter abridged). 



APPENDIX VIII 



TABLE OF REFRACTIVE INDICES 



Water 



Human blood 

 Alum (sat. sol.) 

 Ether . 

 Albumen 

 Absolute alcohol 

 Salt (sat. sol.) 



Refractive index 

 ■333 

 •354 

 356 



359 

 360 

 366 

 375 



Fluor spar . 



Oil of olives 



Naphtha 



Oil of turpentine 



Castor oil . 



Cinnamon oil 



Oil of cedar 



Refractive index 

 1-436 

 1-470 



1-475 

 1-478 



1-487 

 1-508 

 1-51C 



