Context

Context of Posthuma Fosteri: : the description of a ruler, upon which is inscribed divers scales: and the vses thereof: invented and written by Mr. Samuel Foster, late professor of astronomie in Gresham-Colledg. By which the most usuall propositions in astronomie, navigation, and dialling, are facily performed. Also, a further use of the said scales in deliniating of far declining dials; and of those that decline and recline, three severall wayes. With the deliniating of all horizontall dials, between 30, and 60 gr of latitude, without drawing any lines but the houres themselves
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