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nydus/On Growth and FormPublic
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Table of Contents

CHAPTER XI THE LOGARITHMIC SPIRAL

exôÙtenôÙsionum, impresôÙsionum, cirôÙcumôÙvoluôÙtionum, coloôÙrumôÙque:《...《tunc deinôÙceps facile est, quarumôÙcumôÙque CochôÙlearum figuras geoôÙmetôÙricas, curôÙvosque, obôÙliquos atque recôÙtos angulos, ad uniôÙcam omôÙnes speciem reôÙdigere: ad obôÙlongum videlicet tubulum, qui vario modo curvatus, crispatus, extrorsum et introrsum flexus, ita concrevit17.〝

A technical illustration shows a conical seashell aligned with a ruler and protractor to measure its growth angle.

For some years

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