The Preparation of Illustrations for Reports of the United States Geological Survey / With Brief Descriptions of Processes of Reproduction

by John L. Ridgway

APPENDIX.

The matter given in this appendix is much used in making geologic maps and other illustrations. The Greek alphabet and the groups of signs presented are given chiefly to show the correct formation of each letter and sign.

MISCELLANEOUS TABLES.

Length of 1° of longitude measured along given parallels from the Equator to the poles.
[From U. S. Coast and Geodetic Survey Report for 1884, Appendix 6.]

Parallel of latitude. Statute miles. 0 69.172 1 69.162 2 69.130 3 69.078 4 69.005 5 68.911 6 68.795 7 68.660 8 68.504 9 68.326 10 68.129 11 67.910 12 67.670 13 67.410 14 67.131 15 66.830 16 66.510 17 66.169 18 65.808 19 65.427 20 65.026 21 64.606 22 64.166 23 63.706 24 63.228 25 62.729 26 62.212 27 61.676 28 61.122 29 60.548 30 59.956

Parallel of latitude. Statute miles. 31 59.365 32 58.716 33 58.071 34 67.407 35 66.725 36 66.027 37 65.311 38 64.679 39 63.829 40 53.063 41 62.281 42 51.483 43 60.669 44 49.840 45 48.995 46 48.136 47 47.261 48 46.372 49 45.469 50 44.652 51 43.621 52 42.676 53 41.719 54 40.749 55 39.766 56 38.771 57 37.764 58 36.745 59 35.716 60 34.674

Parallel of latitude. Statute miles. 61 33.623 62 32.560 63 31.488 64 30.406 65 29.315 66 28.215 67 27.106 68 26.988 69 24.862 70 23.729 71 22.589 72 21.441 73 20.287 74 19.127 75 17.960 76 16.788 77 15.611 78 14.428 79 13.242 80 12.051 81 10.857 82 9.659 83 8.458 84 7.256 85 6.049 86 4.842 87 3.632 88 2.422 89 1.211 90 .000

Length of 1° of latitude measured along a meridian at given parallels.
[Parallel given is in center of the degree whose length is stated.]

Parallel of latitude.	Statute miles.	Parallel of latitude.	Statute miles.
0	68.704	50	69.115
10	68.725	60	69.230
20	68.786	70	69.324
30	68.879	80	69.386
40	68.993	90	69.407

Metric system and equivalents.