Copy 2

Leybourn's Dialling improv'd. Or, the whole art perform'd, I. geometrically ... II. arithmetically ... Also, how to describe all necessary furniture for sun-dials ... With reflective dialling ... To which is now added, instrumental dialling ... and likewise mechanick dialling ... with the manner of ordering oyl and colours for painting sun-dials. Concluding with tables ... / By Henry Wilson.

  • Leybourn, William, 1626-1716.
Date:
1728
Catalogue details

Licence: Public Domain Mark

Credit: Leybourn's Dialling improv'd. Or, the whole art perform'd, I. geometrically ... II. arithmetically ... Also, how to describe all necessary furniture for sun-dials ... With reflective dialling ... To which is now added, instrumental dialling ... and likewise mechanick dialling ... with the manner of ordering oyl and colours for painting sun-dials. Concluding with tables ... / By Henry Wilson. Source: Wellcome Collection.

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    a ES SES CSS Geometrical DiaLLIna, POT Gte tot amt omnia bin atantn atin oT CP AcaP aoe ETow to make a plain Dial (either South or Horizon~- tal) that foall give you the Hour of the Day at any) Place or Places affigned, as well as at the Placee the Dial is made for, according te the Englith Way of reckoning. | Fi RST, Make a common plain Dial eithers South or Horizontal, as you would have yourr Dial ta be ; only in this Cafe it is beft to place: the Hours ina Circular Form, as you fee: Plate 11. it done; then (befides the two Circles,, Fig. 1. between which the Hours are placed)) draw fo many Concentrick Circles asi you would have Places in the Dial, and behind! the Stile in each Circle put the Name of the Place: whofe Hour it reprefents; then obferve what Dif-- ference gesonsitude the Places propofed have: from Lozdoz, and by allowing 15 Degrees for an: Hour, place the Hours with fo much Difterence: a8 the Difference of Longitude requires, the be ow :