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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0874
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bere, by an Experiment wtrich he made et Lvapo.
Pary 20 che AirK rilins oE Vapors, buc only ro che
makins of rhem moune up on hislu, alcer cties
once are brouxhe or railed into ir.
VARTATION is, accordins co Tycho, chachird
T0 find the Variation at Sea-
Aboux chece tlours belore or alcer Noon, ha-
vine che suns Declination, his Alritude, and che
Lacirude ot che Place, Aind his crue Azimuth, (25
is directed under chac WV ord) obserre also che sun s
Magneticat Azimuth, and ehien che Disferences oE
Inequalies in the Norion oF the MoOn; and arises chole cuo Distances trom the Meridian, is the Va-
trom her Aposaum, beins chansed asher System is riation of the Compass.
carried round che Sun by the Parch. Bullialdus calls The lame is also Found by havins che suns True
this the Moons Restection, expresins ic, Thac her and Masnetical amplicude.
Apo5aon rellects backmards, contrary ro the Order
For it che amplitudes be ot one kind; thatis,
Or Succection oEthe Signs, by reason of which che both Norch, or Boch Souch, cheir Ditterence is the
Angle oF her Lrection is lometimes more, and some. Variation: Bur ot disterent kind; chac is, one
cimes lels, chan ic rould appear ro bc, by conti. Norch, che ocher Souch, cheir Sum is che Varia-
derins only checivo orher Tnequalities. Buc Trcho rion.
aNteris ehis Variation ro be never lels chan 40 Mi- In che Practice oF observins che Variarion, it is
nutes, 30 Scconds.
usual eo catre ic by che Amplicude oF che R isins and
MT. Nemton chints che Variarion is caused parrly Sertins oE che Sun, when his Centre appears in the
by the Elliprick Form of the Hoons Orbit, and Visible Horizon; Whereas he ought to be obserred
Parcly by che Inequalier ol che Momenes of che whenhus under Limb is Cill abore che Horizon a-
Area Which cheMoon deleribes by a Radius drann bour ro chirds oF his Diameter, Or 20 Minures,
coche Parth. This, Prop. 29. B0ok 3. oF his Prin- because oF che Retraction; and che Fseiphe of che
cipia, he Meus hon cotind; and sers it at a mid. Obserrers Fye abore the Surtace oF the Water:
ale Rate, 1o be 35 Minutes, 9 Seconds.
Or ellero vork the Amplirudes, 25 che AZimuths, by
VARLATION oihe Necale, or Compass, is the reckonins che suns Distance From che Zenith, 9c
deviarion, or turnine oF che Magnericat Needle in Degrees 36Minures. Phis, cho it be of licele con-
the Mariner Compass, From the true Norch point: sequence near che Equinoctial, will make a grear
which happens more ox less in most Places; and Error in hixh Larirudes, wtere che Sun Rises and
is commonys called by sea men che Norch tiast. ( Sere Obliguelr.
irse. oe Moreh tr esine es. Mo Neaio.
he Hacrs Pario mniine coperhex in erencex Dropo,
ic descends in Derr, or Rain: Wrhrich Nocion
diters very licele from MP. TTalley S. Only Hom-
ration in Vacuo, concludes, Thar Air is nOF necel