ago Theory of the Siiuation of the Mapneitc Poles, 
the fuppofition that he was near thereto, keep either lying-to, 
or Rraining his fhip in endeavouring to get no farther to lee- 
ward, when at the fame time he might be an hundred miles 
er more from fhere, and fo lofe the very wind he wanted ; 
after which, fhould contrary winds affail him, the injury alfo 
becomes obvious. 
« 
Zo clear apparent or obferycd Lunar Diflances from the Effects 
_ of Refraétion and Parallax by the Swit of the Circles. 
Set the vernier on the firft meridian, carrying the circle or 
femicircle of pofition to the apparent altitude of the fun’s 
eentre, or that of the ftar; the vernier on the moveable meri- 
dian to the apparent altitude of the moon’s centre; and the 
yernier on the circle or femicircle of pefition to the apparent 
diftance of the fun and moon’s centres, or of the centre of 
the moon and fixed ftar. Let thefe form a {pherical triangle; - 
fo fhall the number of degrees, minutes, and feconds on the 
eguator, comprehended between the firft and moveable me- 
ridian, fhew the angle (or difference of azimuths) at the ver- 
tex, which angle is common to the apparent and true tri- 
angle. Keeping faft, therefore, the faid meridians by means 
of the equator, fet the vernier on the firft meridian to the true 
altitude of the fun or fiar’s centre, and the vernier on the 
moveable meridian to the true altitude of the moon’s centre; 
then fee what number of degrees, minutes, and feconds of 
the circle or -femicircle of pofition or diftance are contained 
between them, for that is the true diftance. 
: Port/mouth, Dec. 13, 1795: 
WE certify, that, in our opinion, a compafs and fextant 
invented by Mr. Nugent merit an expeditious and accurate 
inveftigation and trial. ¢ 
(Signed) TT, Packenuam, Le Jujfie. 
J. Craunston, Bellerophon, 
E, Gowen, Triumph. 
W. Domert, Royal George. 
R, Bowen, Terp/ichore. 
The foregoing certificate was given to me, unfolicited, for 
the purpofe of being tranfmitted to the Lords Commiffioners 
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