‘Tan meen to a Radius of 10,000,000 parts to each 
firit robles of the kind 
‘maticians at 
ceinaigpahide ‘ile inthe Presets lang uage. Several years after 
*Mr. Gunter's death, Mr. Winasute publithed an Englith 
-tranflation 
tle of the « 
- He alfo introduced the common epee eye now con- 
ete got 
pee ts 
peg eect ' 
‘The works of ‘Mr. Gamer hich were public in fepa- ? Dew 
erent times, been c Bea 
piece on the dials excepted) ; sod sardees ediniooe- of them 
* 
GUNTER’S LINE. ? 
Canon Triangulorum, or A Table of Artificial a and 
A 
o 
of the Quadrant,’’ to which were added “ Logarithins of ab- 
folute numbers, cee ah unit to ten thoufand,’’ with a rule 
for se, Samy ty 100,000. It ought to be men- 
tioned, to the honour a Mr. Gunter, that sie the 
that were ever 63 ; ola 
ticians and 
e the operatio 
tion for thofe of Pace, esis md diviGon Mr. ter’ 
to this application of logarithms to the 7: Met of 
fpherical triangles was fatisfactorily eftablifhed b 
mund Wingate, Mr. Robert Burton, and Mr. He enry Bond, 
‘fen. In the year 1622, Mr. Gunter found, by experiments 
on the variations of the magnetic needle, made at Deptford, 
that this variation varied, and that the declination had 
changed almoft five degrees in the {pace o years; a 
di i confirmed and eftablifhed by Mr. Gel- 
librand, his fucceffor at Grefham college. e VARIA- 
tron.) ‘The next invention of Mr. Guater, which we have 
to os is that ot his ** Rule of wep by which 
gonometry may be refolved with a pair eee IM in 
confequence of the now well-known principle, that the loga- 
rithms of the terms of it ratios are —— nt. one 
mmon fes, is commo: ae 
called the “ Gunter.’”” (See the fallow ‘ing articles.) This 
invention was communicated, i in 1624, to the French mathe- 
by Mr. ngety who publifhed an ac- 
of his French eatndt with many ee sand 
is) 
{urveying, and hence ¢ ‘s Gunter’ 
i is in Whitehall Garden,” cra But it is 
ribe thefe 
dials, on ingenious 
feveral lines, and of which he gave an ac- 
tife, as thefe dials no longer remain ; having 
ae “forthe fin of the complement of en atingand deltas 
= ons 
ae es a ee pieatints, “ 
pa tir ball pee oa 
parate tracts at 
« Logarithmic Cie o : 
logarithms _ 
iffued from the prefs. The fifth edition is that of Mr. W. 
Leybourn, 1673, 4to., containing the “ Cz 
lorum,’’ and an aecount of the fector, crofs-ftaff, coodgdans 
portable quadrant, and other inftruments, with fencical sedi. 
tions by Mr. Samuel Fofter, Mr. Henry Bond, and the 
‘editor, Mr. William Leybourn. Ward’s Lives of the Pro. 
feffors of Grefham Shag Se Pp. 77, &c. 
See Cua Ne 
GunTER's Pae called alfo Line of Lines, and Line of 
umbers, is a gncene hewta line ufually placed on 
{cales, rales, fector. 
This line conhitte oF ‘the logarithms transferred upon a 
ruler, from the tables, by.means of a feale of equal parts, 
© as to anfwer much the fame purpofes, inflrumentally, 
as the logarithms themfelves do arithmetically, What the 
logarithms - by addition and {ubtraétion, is done in this 
by t a pair of compatfles this way and that. 
This line ri been contrived various ways, for the advan- 
tage of having it as long as poffible 
feet ruler, contrived by Edmund See nd called  Gun- 
ter’s Scale ;”” whence alfo ve Jine itfelf took its — 
denomination :« Gunter’s 
After this, sat in ein doubled the line, or laid 
= the lo ‘foth : hms on two fee “ee fliding againft 
tha 
wm 
rag 
om Oo 
. 
a 
Qu 
ao) 
2) 
{piral en 
be conftructed in the year 1748. The fpiral has 10 turns, 
and its exter! meter is 12 inches, contains. 
numbers, fines, and tan gents, the latter being twice repeated, 
and may with eafe be ufed to compute to four places, and 
an eftimate agure’s ee is to the full as much as — be 
one with a c ohter% feale of é feet in 
In 1657 = were fale ried on the prefent common | 
rule by M h Partridge. a 
Lailly, “Me William ‘Nicholfon propofed enathae ify 
fition of them in con he Phil. Sheen o# 
1787. His inftrument is = idee oe a ttraight rule 
the length of 285 inches. Ite onfifts: of three’ — 
- circles, 2: plate of » about 1 inch 
in diameter. From the centre aesed two legs, ba 
right-lined edges in the direction of which are move- 
numbe Ts 
quent in “the lix Slee: rae or fitvatiow 
divided into 
divided into equal interaly cle et oats 
ee with the eat 
