The art of dialling [electronic resource] : by a new, easie, and most speedy way : shewing, how to describe the houre-lines upon all sorts of plaines, howsoever, or in what latitude soever scituated : as also, to find the suns azimuth, whereby the sight of any plaine is examined : performed by a quadrant, fitted with lines necessary to the purpose / invented and published by Samuel Foster, professor of astronomie in Gresham Colledge.