Smith, Hamilton Lanphere, 1819-1903. [from old catalog] · Cleveland, M. C. Younglove and company · leaf 77
dicated on the paper, and the centre of the circle A,draw the hour-lines A F, A G, A H, &c, extending, however,only to the circumference of the circle, and we have a dial readyfor use, after adding the figures. Of course the little circle mustbe so adjusted that when the line is passed by some… … figure. In order to use it, we must next determine the north andsouth line, or a meridian line, and place the line on our dial whichmarks XII, to correspond therewith. This may be ascertainedby means of a surveyors compass, provided the variation of theneedle from true north is known ; or, at the…
Astronomy · Meteorology · Geology · Paleontology
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![An illustration from Cosmographia in qvatvor libros distribvta summo ordine, miraqve facilitate, ac breuitate ad magnam Ptolemæi mathematicam constructionem, ad vniuersamque astrologiam institutens. Francisco Barocio ... avtore. Cum præfatione eiusdem autoris, in qua perfecta quidem astrologiæ diuisio, & enarratio autorum illustrium, & voluminum ab eis conscriptorum in singulis astrologiæ partibus habetur: Joannis de Sacrobosco verò 84 errores, et alij permulti suorum expositorum, & sectatorum ostenduntur. rationibusq[uam] redarguuntur. Præcesserunt etiam quædam communia mathematica, necnon arithmetica, & geometrica principia, nonnullæq[uam] propositiones, de quibus in toto opere sæpe fit mentio: ac demum locupletissimus index eorum, quæ ipsa Cosmographia continentur .. (1585)](https://img.insideoutlibrary.com/img/200/ia-cosmographiainqv00baro-123-43.webp)
