Celestial and 'Terrestrial Globes. 235

and charts may then be laid before him withpropriety, in order to confirm him in theknowledge of the particular parts of thosevery parallels, of which he has already at-tained a general idea upon the globe.

PROBLEM LI.

To find a signal, or warning Pear,that shall be upon or near themeridian os an observer, at thetime any known star is perpen-dicular to any place on its cor-responding parallel.

295. Bring the given place to the gra-duated side of the strong brass meridian onthe terrestrial globe, and it will cut the de-grees of its longitude, reckoned eastwardfrom Lone n, upon the upper row of figuresover the equator ; then

Apply to the celestial globe, and set thegiven star under the graduated side of thestrong brass meridian, which will cut thedegree of its right ascension on the equi-noctial.

If