CHAPTER XI THE LOGARITHMIC SPIRAL

after the apôÙpearôÙance of MoseôÙley〙s paper, a number of writers followed in his footôÙsteps, and atôÙtempôÙted, in various ways, to put his conôÙclusôÙions to pracôÙtical use. For inôÙstance, D〙OrôÙbigôÙny deôÙvised a very simôÙple proôÙtracôÙtor, which he called a HelôÙiôÙcoôÙmeterÿ£¢¹⁸,