Identifier: encbritannica05macf (find matches)
Title: Encyclopædia britannica : or, A dictionary of arts, sciences, and miscellaneous literature : constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises or systems ..
Year: 1797 (1790s)
Authors: MacFarquhar, Colin, ca. 1745-1793 Gleig, George, 1753-1840
Subjects: Encyclopedias and dictionaries
Publisher: Edinburgh : Printed for A. Bell and C. MacFarquhar
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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place the hour-fcale to 51 32 asbefore, and pulh down the hours, quarters, &c. anddraw the lines thi-ough them for the afternoon hou.-Sywhich is clearly reprcfented. in the iigiu-e. In like manner is an ereil north or fouth dial drawri,(fee fig 2.), the operation being juil the fame, onlyreverfiug the hours as in the figure, aud marking the.angles of the ililes height equal to the complement ofthe latitude. This trigon may be likewlfa ufed for drawing verti-cal declitimg dials (fig. 3), as it is with the fame facility-applied to the lines A ^, GB, and the hours and quar-teis marked oftas before direfted. Mr Jones graduates on the fcale BD of the tri-»gon a line of chords, which is found ufeful for layingoff the neceflary angles of the lUles height. Thefcales of this trigon, whennot in ufe, lie very clofe toge-ther, and pack up into a portable cafe for the poc-ket. DIA- rialf CI.XI. t^ia. (3. _^^ r ™ s. --^ —^ 1 \f vN - l Kn n p\ J ^ )v 1 1 n V X 1 11 y\ ■1 c V \ nr a xn I n
Text Appearing After Image:
. ^^.■^ra, f/n7t/r.;Al,/r-r/rWf. D I A ( 805 ) D r A Di/iiisa Lines, or Sca/es, are graduated lines, pla-ced on rules, or the edges of quadraiit-s, and other in-llriiments, to expedite the coiiilruftioii of diali. Sec Plate CLVHI. DisLiNG-ScSoi: See Dialing, p. 803, and PlateCLXI. DiAijKG-SpIicre, is an inftrument made of brafs, withfevernl femicircles (liding over one another, on a mo-ving- horizon, to demonilrate the nature of the dottrineof fphtrical triangles, and to give a true idea of tliedrawing of dials on all manner of jjilanes. DiALiNGTrigon. Sec Dialing, p. S04, and PlateCLXI. Dialing, in a mine, called alfo Plumming, is theufing of a compafs (whieh they call dial), and a longline, to know which way the load or vein of ore inclines,or where to fliift an air-lhaft, or bring an adit to a de-fired place. DIALIS, in antiquity, a Latin term fignifyingfometiiing that belongs to Jupiter.—The word is form-ed from ^.-i the gcnitlvi; of 3iu,-, Jupiter. Flamm Di.ir.is. See Fi.amem

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