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Smith, G. / The laboratory; or, School of arts: containing a large collection of valuable secrets, experiments, and manual operations in arts and manufactures, highly useful to gilders, jewellers, enamellers, goldsmiths, dyers, cutlers, pewterers, joiners, japanners, book-binders, plasterers, artists, and to the workers in metals in general; and in plaster of paris, wood, ivory, bone, horn, and other materials
(1799)
Part VI. Gnomonics; or, the art of dialling, pp. 109-126
Page 109
IALIG
PART V.L
GNOMONICS;
OR,
THE ART OF DILLING.
PROBLEM L
to prepari the fwundamntal Quadrant for the erecting
ofSan-dis.
'"RAW the line a b~fig. 1. plate XIV; erect thereon a
L.Iperpendicular, b c; froi b describe the arch a c,
i ourth part of a cic, and containing ninety
4eges ThenMok for the e1~vation of the pole, or tlh
ltu of the plae where the dial is designed for, which,
for. exmmla, for London, is fifty-one degrees, thirty-two
inutes ; subtract this from the ninety degrees, and there
reugain thirty-eight. degrees, twenty-eight minutes. This
done, divide the arch a c in three equal parts, each con-
tainingthirty degrees. The part d e divide again into three
parts, each containing ten degrees. These ten degrees di-
%ide again in two, each coiAtaining five degrees, consequently
from a tof thirty-five degrees. Divide f g in five single
degrees.
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