. Graphical and mechanical computation . -20+ Fig. 91 b. Art. 91 NUMERICAL EVALUATION OF THE COEFFICIENTS 197 ^6 = T* (yo — yso + ^60 — ^90 + * + ^300 — ^wo) = tV (9-3 ~ i5-o + 174 - + - + - - + — 14 2 + ) = &6 = iV (Jl5 - ?« + 3*75 ~ ^lOS + + 3>315 ~ Jito) = tV (i3-o - + - + - + + - + - - ) = 40-i-y. -20^ Fig. 91^. To determine a5 and b5 measure 10 ordinates at intervals of 360,beginning at x = o° and x = 180 respectively (Fig. 91c) then #5 = T(T (yo — ^36 + ^72 ~ ^lOS + + ^288 ~ ^324) = tV (9
. Graphical and mechanical computation . -20+ Fig. 91 b. Art. 91 NUMERICAL EVALUATION OF THE COEFFICIENTS 197 ^6 = T* (yo — yso + ^60 — ^90 + * + ^300 — ^wo) = tV (9-3 ~ i5-o + 174 - + - + - - + — 14 2 + ) = &6 = iV (Jl5 - ?« + 3*75 ~ ^lOS + + 3>315 ~ Jito) = tV (i3-o - + - + - + + - + - - ) = 40-i-y. -20^ Fig. 91^. To determine a5 and b5 measure 10 ordinates at intervals of 360,beginning at x = o° and x = 180 respectively (Fig. 91c) then #5 = T(T (yo — ^36 + ^72 ~ ^lOS + + ^288 ~ ^324) = tV (9-3-I5-3 + +33-0-I5-3-I-0+9-5-I5-0+)= — h = tV (jl8 — ^54 + J90 — ^126 + * + ^306 ~ ymt) = to (++ + + ) = 30- 20- 10 -10- ~20± 2J5C0° 45° e±5° 1E~ ° 1— ° 375= X Fig. gid. I9& EMPIRICAL FORMULAS —PERIODIC CURVES Chap. VII To determine a4 and £>4 measure 8 ordinates at intervals of 450, be-ginning at x = o° and x = 22|° respectively (Fig. gid); then 04 = 1 (> — 345 + ^90 — 3*135 + * + 3270 ~ 33is) = 1 ( - + - + + - + ) = h = I (^ — + — • • • + ~ ) = I ( - + - + + - + ) = To determine az and b3 measure 6 ordinates at intervals of 6o°, be-ginning
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