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De bifilairmagnetische methode ter bepaling van de horizontaal-intensiteit der aardmagneetkracht

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P- = 1 — % rf2 + '% ƒ , sina« + !Yl2H rf4 + % • P» = 1 — % ^2 -I- '% 2 Sm'"" + l1///|28 ^4 + % a I-

(J-f ö-z Cf- dn Q"i un Un

= 1 — 0.008291 +0.000023 + 0.000057 + 0.000212. = 1—0.00S282 + 0.000023 + 0.000057 + 0.000236.

= 0.99200 (log P2 = 9.99651 — 10). = 0.99203 (log P„ = 9.99653 — 10).

Qs = 1 — % 4j- + "/♦ ^ sin2« + «/,„ + 3 • Q„ = 1 — % + "/4 a sin2a + 45/12S ö) 4 + 3 a ;, •

- 1 — 0.016581 + 0.000015 + 0.000172 + 0.000424. = 1 — 0.016564 + 0.000016 + 0.000171 + 0.000473.

= 0.98403 (log Q- = 9 99301 — 10). = 0.98409 (log Q„ = 9.99304 — 10).

s2 = U (l + es + 2^3+2^+2 S» = f» (X + °» + 2 aS + 2 a} + 2 (a. + a„)3)'

= 0.99976 (1 + 0 00003 -f 0.00005 + 0.00007 + 0.00001). = 0.99986 (1 + 0.00004 + 0.00005 + 0.00007 + 0.00001).

= 0.99976 x 1.00016. = 0.99986 X 1.00017.

= 0.99992 (log S_- = 9.99997 — 10). = 1.00003 (log S„ = 0.00001).

P2 cos u — 2 Qs sin u tg <pz 0.99173 — 0.00120 P„ cos « — 2 Q„ sin a tg <pn _ 0.99178 — 0.00120 _

S, 0.99992 Sn 1.00003

TT99992 = ° "061 (1°g = 9-!'9590 ~ 10)' L00003 = °-"055 {1°g = 9""588 ~ 10)"