The London, Edinburgh and Dublin philosophical magazine and journal of science . Thus we obtain, for the total intensity of illumination at aninternal point in the very neighbourhood of the rim, T 1 2 fYfrh \ . E (»?> tf SiD ^ ^ 1?~i ^(2a-8)lri9lj+ fc 2*4 Vl-^sin2^/ . (V.) 2>/«(a—8) At an external point, T- 2 /Ff, , E(fr) *,2 sin 20t \ ie-7r2(2«-S)\ri9lj */ i2/:/v/l-^2sin2(/,1/ Z wa{a — o) The expression within the bracket can be calculated bymeans of Legend res table ; the course of the function fordifferent values of I o ,2_4a(g-g) £ * ~ (2a-df 2a-d. Figr. 9.

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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840