Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 56
as AD, Fig. 125, which bisects the anglebetween two other radii, as AC and AB, is a mean 52 th:e development of curves 53 proportional between them, that is, (AD)2=AOxAB. This spiral is called equiangular he-cause the angle between any radius vector and thetangent to the curve at its extremity is… … Fig. 125—The Logarithmic Spiral. Its intersection with the semicircle at D will deter-mine the required point, and AD will be a meanproportional between AC and AB. Other pointson the cnrVe lying on the diameters BC and DFmay b^ obtained by intefsecting these diameterswith the pefpendiculafs CL, LM,…
Mechanical drawing · Machine design
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