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.

    276/316 (page 242)
    @ the Direéions given, (Set. 1.) For drawing ann Horizontal Dial, what Angle every Hour-line: makes with the Meridian, and in this Cafe, theyy muft make an Angle equal to the Complement oft the fame Angle with the Equino@ial. As for Exe- ample. ; . ; Suppose I would make an Horizontal Dial for: Latitude 51 Degrees, 32 Minutes North. I! fhall find by the Dire@tions given, Se@&. 3x. that: the Hour-lines make Angles with the Meridian, as followeth. d. m. T2 0 Oo TE Ot EE’ 559 IO 2 24 20 9 3 makes anAngle of 38 3 3 4 5335 Th 5 ees | 6 90) O ee THESE are the Angles that each Hour-line makes with the Meridian; their Complements to be made with the Equinodtial, are, For