717 



TABLE 805. 



-ACCELERATION OF GRAVITY ( g ) IN THE UNITED STATES 

 (concluded) 



Observed Free-air Isostatic 



c . . r . , Elevation gravity anomaly anomaly 



Station Latitude Longitude m gal gal gal 



Richmond, Va 37°32'.2 77°26'.l 29.9 979.963 +.009 000 



St. Louis, Mo 38 38.0 90 12.2 153.9 980.004 —.008 — 007 



St. Petersburg, Fla 27 48.9 82 40.2 15 979.191 +.025 +006 



Salt Lake City, Utah 40 46.1 11153.8 1322 979.806 —.035 +006 



San Francisco, Calif 37 37.5 122 25.7 114.3 979.968 +.018 —.022 



Seattle, Wash, (university) 47 39.6 122 18.3 58 980.736 —.115 —095 



Sheridan, Wyo 44 48.0 106 58.7 1149.9 980244 —.012 +010 



Smith College, Mass 42 19.0 72 38.2 54.6 980.376 +.005 +.006 



State College, Pa 40 47.9 77 51.8 357.8 980.127 —.014 — 014 



Terre Haute, Ind 39 28.7 87 23.8 150.9 980.075 —.013 —.011 



Traverse City, Mich 44 45.8 85 37.2 180.1 980.553 +.001 +.001 



Wallace, Kans 38 54.7 101 35.4 1005 979.758 —.016 —.016 



Washington, D. C. : 



Geophysical Laboratory 38 56.6 77 03.4 88.1 980.104 +.044 +.036 



National Bureau of Standards... 38 56.5 77 03.9 95.1 980.100 +.042 +.034 



Smithsonian Institution 38 53.3 77 01.5 10.4 980.118 +.039 +.038 



Wheeling, W. Va 40 04.0 80 43.3 205 980.088 —.035 —.032 



Winnemucca, Nev 40 58.4 117 43.8 1311 979.847 —.016 —.012 



Worcester, Mass 42 16.5 71 48.5 170.0 980.328 —.003 —.022 



Wright Field, Ohio 39 46.6 84 05.9 247.8 980.094 +.010 +.008 



Yuma, Ariz 32 43.3 114 37.0 53.9 979.532 —.007 +.006 



TABLE 806.— LENGTH OF SECONDS PENDULUM AT SEA LEVEL AND FOR 



DIFFERENT LATITUDES 



Calculated from Table 802 by the formula l — g/w 2 . For each 100 ft of elevation subtract 

 0.000953 cm or 0.000375 in. or 0.0000313 ft. This table could also have been computed by either 

 of the following formulas derived from the gravity formula at the top of Table 802. 



/ = 0.990961 ( 1 + 0.0052884 sin 2 <p — 0.0000059 sin 2 2 0) meters. 

 / = 0.990961 + .0052406 sin 2 <p — 0.0OOOO58 sin 2 2 <p, meters. 

 / = 39.014135 ( 1 + 0.0052884 sin 2 <t> — 0.0OOOO59 sin 2 2 <p) inches. 

 / = 39.014135 + 0.2063214 sin 2 <t> — 0.0002302 sin 2 2 <p, inches. 



SMITHSONIAN PHYSICAL TABLES 



