Lukin, James. [from old catalog] · New York, G. P. Putnam's sons · leaf 283
were simple examples.These are represented in the following figures, A and B,while the others are all forms producible by a centre-bitalone without any aid from machinery, it being onlynecessary to know just the various positions for the 272 BO V ENGINEERS. point of the centre-bit, and the proper… … L Fig. 23. yoniigsters. A is a pentagon in a circle, which is thefoundation of the five-looped figure called by arcliitects acinq^uefoil or five-leaved design. The lines radiating DESIGNS. 273 from the ceutre of the maiu circle to the angles are thoseon which lie the centres of the five circles…
Handicraft · Steam-engines
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