. Journal. To face p. 162. TOWN SEND 6. a. To (ao p. 162. STABILITY OF CHIMNEY SHAFTS. 163 If Kg, rQ be the lengths for an axis inclined at an angle 0to the diameter corresponding to K and r, I Kd Vq = — = constant; therefore the boundary of the kernel, which is the locus of theextremity of K, is evidently a series of right lines at rightangles to the diagonals, forming a figure similar to the figure Fig. 6. Fig. 7.

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Keywords: ., bookcentury1800, bookdecade186, bookpublisherlondon, bookyear1861