Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 i66 E. LANCASTER JONES TABLE I A d Adja- cent As !»' 3m' tn 3w'' 3m'iv miv. . . I 2 + 5 + io 2 + 5 i+3 3-333 5 -3-333 â I. Ill . ⢠⢠3 4 5 6 â IO â 20 + 5 â IO 2+4 3+5 1+4+6 5 -3-333 -3-333 -3-334 -8-333 â 1. in â0. no -3-889 â â â â -3-333 â . . â . . . The values
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 i66 E. LANCASTER JONES TABLE I A d Adja- cent As !»' 3m' tn 3w'' 3m'iv miv. . . I 2 + 5 + io 2 + 5 i+3 3-333 5 -3-333 â I. Ill . ⢠⢠3 4 5 6 â IO â 20 + 5 â IO 2+4 3+5 1+4+6 5 -3-333 -3-333 -3-334 -8-333 â 1. in â0. no -3-889 â â â â -3-333 â . . â . . . The values for m obtained by summing the first four elements m' to miv are within of the correct values, and would be quite near enough in practice for obtaining the values of gravity at the stations and drawing up the isogam chart. The original link-increments from Fig. 2. which the d's were calculated were of the order of 50 units, so that the final values adjusted on the basis of this fourth approximation would be correct within 2 per cent, which is the limit for gravity work of this type. The final values, obtained by putting m equal to m'-\-m'+m''-\-miy are ^1=, ^2=, m3= â , m4= â , w6= â, w6= â , which should be compared with the values obtained in the next section. A more rapid approximation in the solution of the set of correlate equations nrmT â Xmx = dr can be obtained by solving partially for those which involve mr, as follows. We have, say, nrmT â mx â mt â my â tnz = dr, nxmx â mr â ma â mb â ⢠⢠â = dx, ntmt â mT â m, â mf â ⢠⢠⢠= d,, tiyinv â tnr â tn^ â ntk â â ⢠â = dy, ti*tnt â mr â nip â tnq â â ⢠⢠= dz. 826
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