APEBTURE TABLE. 



Numerical 

 Aperture. 



(n sin u — a.) 



Corresponding Angle (2 m) for 



Mr 

 (n= 1-00). 



180° 0' 

 157° 2' 

 147° 29' 

 140° 6' 

 133° 51' 

 128° 19' 

 123° 17' 

 118° 38' 

 114° 17' 

 110 

 106' 

 102 



98 



95 



92 



10' 

 \&' 

 31' 

 56'. 

 28' 

 6' 



88° 51' 

 85° 41' 

 82° 36' 

 79° 36' 

 76° 38' 

 73° 44' 

 70° 54' 

 68° 6' 

 65° 22' 

 62° 40' 

 60° 0' 

 53° 30' 

 47° 9' 

 40° 58' 

 34° 56' 

 28° 58' 

 23° 4' 

 17° 14' 

 ir 29' 

 0° 44' 



Water 

 (n = 1-33). 



4' 

 55' 



3' 

 26' 



0' 



180° 0' 



165° 56' 



155° 38' 



148° 42' 



142° 39' 



137° 36' 



133° 



128= 



125° 



121^ 



118° 



114° 44' 



111° 36' 



108° 36' 



105° 42' 



102° 53' 



100° 10' 



97° 31' 



94° 56' 



92° 24' 



89° 56' 



87° 32' 



85° 10' 



8:i° 51' 



80° 34' 



78° 20' 



76° 8' 



73° 58' 



71° 49' 



69° 42' 



67° 37' 



65° 32' 



63° 31' 



61° 30' 



59° 30' 



57° 31' 



55° 34' 



53° 38' 



51° 42' 



49° 48' 



47° 54' 



46° 2' 



44° 10' 



39° 33' 



35° 



30= 



26° 



0' 

 30' 



4' 

 40' 

 18' 

 58' 

 38' 

 18' 



Homogeneous 

 Immersion 

 Cw = l-52). 



10' 

 16' 

 26' 



180° 0' 



166° 51' 



161° 23' 



157° 12' 



153° 39' 



150° 32' 



147° 42' 



145° 6' 



142° 39' 



140° 22' 



138° 12' 



136° 8' 



134' 



132' 



13C< 



128° 40' 



126° 58' 



125° 18' 



123° 40' 



122° 6' 



120° 33' 



117° 35' 



114° 44' 



111° 59' 



109° 20' 



106° 45' 



104° 15' 



101° 50' 



99° 29' 



97° 11' 



94° 55' 



92° 43' 



90° 34' 



88° 27' 



86° 21' 



84° 18' 



82° 17' 



80° 17' 



78° 20' 



76° 24' 



74° 30' 



72° 36' 



70° 44' 



68° 54' 



67° 6' 



65° 18' 



63=" 31' 



61° 45' 



60° 0' 



58° 16' 



56° 32' 



54° 50' 



53° 9' 



51° 28' 



49° 48' 



48° 9' 



46° 30' 



44° 51' 



43° 14' 



41° 37' 



40° 0' 



38° 24' 



34° 27' 



30° 31' 



26° 38' 



22° 46' 



18° 56' 



15° 7' 



11° 19' 



7° 34' 



3° 46' 



Limit of Resolving Power, in Lines to an Inch 



White Light. 



(A. = 0-5269^i., 



Line E.) 



146,543 

 145,579 

 144,615 

 143,651 

 142,687 

 141,723 

 140,759 

 139,795 

 138,830 

 137,866 

 136,902 

 135,938 

 134,974 

 134,010 

 133,046 

 132,082 

 131,118 

 130,154 

 129,189 

 128,225 

 127,261 

 125,333 

 123,405 

 121,477 

 119,548 

 117,620 

 115,692 

 113,764 

 111,835 

 109,907 

 107,979 

 106,051 

 104,123 

 102,195 

 100,266 

 98,338 

 96,410 

 94,482 

 92,554 

 90,625 

 88,697 

 86,769 

 84,841 

 82,913 

 80,984 

 79,056 

 77,128 

 75,200 

 73,272 

 71,343 

 69,415 

 67,487 

 65,559 

 63,631 

 61,702 

 59,774 

 57,846 

 55,918 

 53,990 

 52,061 

 50,133 

 48,205 

 43,385 

 38,564 

 33,744 

 28,923 

 24,103 

 19,282 

 14,462 

 9,641 

 4,821 



Monochromatic 



(Blue) Light. 



(A =0-4861/11, 



Line F.) 



158,845 

 157,800 

 156,755 

 155,710 

 154,665 

 153,620 

 152,575 

 151,530 

 150,485 

 149,440 

 148,395 

 147,350 

 146,305 

 145.260 

 144,215 

 143,170 

 142,125 

 141,080 

 140,035 

 138,989 

 137,944 

 135,854 

 133,764 

 131,674 

 129,584 

 127,494 

 125,404 

 123,314 

 121,224 

 119,134 

 117,044 

 114,954 

 112,864 

 110,774 

 108,684 

 106,593 

 104,503 

 102,413 

 100,323 

 98,233 

 96,143 

 94,053 

 91,963 

 89,873 

 87,783 

 85,693 

 83,603 

 81,513 

 79,423 

 77,333 

 75,242 

 73,152 

 71,062 

 68,972 

 66,882 

 64,792 

 62,702 

 60,612 

 58,522 

 56,432 

 54,342 

 52,252 

 47,026 

 41,801 

 36,576 

 31,351 

 26,126 

 20,901 

 15,676 

 10,450 

 5,225 



Photography. 

 (A. = 0-4000^1, 

 near Line h.) 



193,037 



191,767 



190,497 



189,227 



187,957 



186,687 



185,417 



184,147 



182,877 



181,607 



180,337 



179,067 



177,797 



176,527 



175,257 



173,987 



172,717 



171,447 



170,177 



168,907 



167,637 



165,097 



162,557 



160,017 



157,477 



154,937 



152,397 



149,857 



147,317 



144,777 



142,237 



139,698 



137,158 



134,618 



132,078 



129,538 



126,998 



124,458 



121,918 



119,378 



116,838 



114,298 



111,758 



109,218 



106,678 



104,138 



101,598 



99,058 



96,518 



93,979 



91,439 



88,899 



86,359 



83,819 



81,279 



78,739 



76,199 



73,659 



71,119 



68,579 



66,039 



63,499 



57,149 



50,799 



44,449 



38,099 



31,749 



25,400 



19,050 



12,700 



6,350 



Illuminating 

 Power. 



•310 

 •280 

 •250 

 •2-20 

 •190 

 •161 

 •132 

 •103 

 ■074 

 •045 

 •016 

 •988 

 960 

 •932 

 904 

 '877 

 ■850 

 823 

 796 

 769 

 742 

 690 

 638 

 588 

 538 

 488 

 440 

 392 

 346 

 300 

 254 

 210 

 166 

 124 

 082 

 040 

 000 

 •960 

 •922 

 •884 

 ■846 

 •810 

 •774 

 •740 

 •706 

 •672 

 •640 

 •608 

 •578 

 •548 

 •518 

 •490 

 •462 

 •436 

 •410 

 •384 

 •360 

 •336 

 •314 

 •292 

 •270 

 •250 

 •203 

 •160 

 •123 

 •090 

 •063 

 •040 

 •023 

 •010 

 •003 



