TABLE 1 



Comparj. son of Angles and Distances as Orthogonal Crosses 

 Specific Contours for the Various Methods of Drawing 

 Orthogonals. Wave Period is 20 seconds 



4k 

 (fathoms) av law S-K Isaacs laTf S-K-I Isaacs S-K 



d "l"'^ Snell's Snell ' s 



61 80° 800 80*^ 0.00 0.00 0,00 0.00 



,0076 (20 13>) (20X3!) (2° 29') (5.0926) (5.1448) (5.0941) (5.0929) 



50 77° 47' 77° 47' 77° 31' 5.0926 5.1448 5.0941 5.0929 



.018 (4° 5') (4° 6') (4° 42') (3.9382) (4.0170) (3.8753) (3.9^3) 



40 73° 42' 73° 41' 72° 49' 9.0308 9.1618 8.9694 9.0252 



.044 (7°0') (7°0') (8° 9') (2.7842) (2,8682) (2.6731) (2.7750) 



30 66° 42' 66° 41' 64° 40' II.SI50 12.0300 11. 642 5 11.8002 



.040 (4° 51') (4° 4.9') (4° 53') (2.0715) (2.0959) (1*9147) (2.0760) 



25 61° 53' 61° 53' 59° 47' 13,8865 14.1259 13.5572 13.8762 



.062 (5° 49') (5° 52') (6° 4") (I.6605) (1.6772) (1.5396) (I.66OJ) 



20 56° A' 56° 1' 53° 43' 15.5470 15.8031 15 .0968 15.5370 



.094 (7° 3') (7° 4') (7° 21') (1.3061) (1.3145) (1.2051) (1.29S1) 



15 490 i< 48° 57' 46° 22' 16.8531 17.1176 16.3019 16.8351 



.155 (B°45') (8° 45') (9° 19' ) ( .9876) ( .9967) ( .9014) ( -9350) 



10 40° 16' 40° 12' 37° 3' 17.8407 18.1143 17.2033 17.8201 



.150 (6° 29') (6° 28') (6° 30') ( .7538) ( .7564) ( .6776) ( .7526 



7 33° 47' 33° 44' 30° 33' 18.5945 18.8707 17.8809 18.5727 



.150 (5° 11') (5°, 12') (5° 4') ( .6042) ( .6052) ( .5334) ( .604I) 



5 28° 36' 28° 32' 25° 29' 19.1987 19.4759 18.4143 19-1768 



.237 (6° 26') (6° 26') (6° 28') ( .4752) ( .4750) ( .4IO6) ( .4732) 



3 220 10' 22° 7' 19° 01' 19.6739 19.95C)9 18.8249 19.6500 



.194 (4° 04') (4° 04') (3° 50') ( .3667) ( .36fal) ( .3030) ( .3656) 



2 18° 06' 18° 03' 15° 1] ' 20.0406 20.3170 19.1329 20.OI56 



.335 (5° IS') (5° 18') (5° 12') ( .2765) ( .2761) ( .2237) ( .2755) 



1 12° 48' 12° 4.5' 9° 59' 20.3171 20.5931 19.3566 20.2911 



+.2760 -.9605 -.0260 



+1.36fi -4.73JS 0.13^ 



33 



