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A DESCRIPTION of a REFLECTING LEVEL or an ARTI- 

 FICIAL HORIZON/or/tf/J/«^ ALTITUDES of the CELES- 

 TIAL BODIES, S5fr. on Land by HADLEY's QUADRANT, 

 wth fame REMARKS on different LEVELS. By the Reverend 

 JAMES LITTLE. 



1 HE ufefulnefs at fea of that excellent inftrument, the Hadley's Read oaober 

 quadrant, is known to every navigator, it being the only one by ^°' > '79 • 

 which, without any ftand or fixed pofition, and even when the 

 obferver is in motion, accurate obfervations can be made of the 

 altitudes of the celeftial bodies and their angular diftances in 

 order to find the longitude ; and it would alfo, as being the moft 

 accurate and ready of all fmall and portable inftruments of that 

 nature, be exceedingly ufeful at land, efpecially to a traveller, 

 in taking curfory obfervations, to difcover the latitude, &c. of 

 places occafionally vifited, if it were furnifhed with an artificial 

 horizon or level to fupply the place of that natural one which at 

 fea the water around the obferver affords, and from which the 



altitudes 



