104 Description and Use of the

into twelve parts, and mark them with thecharacters of the twelve signs, as they areengraved in fig. 8. or upon the broad pa-per circle; placing S at the north, vs atthe south, T in the east, and « in thewest : the mariner's compass under theglobe will direct the situation of thesepoints, if the variation of the magneticneedle be attended to.

Note, At London the variation is be-tween 20 and 2i degrees from the northwestward.

Elevate the north pole of the globe, sothat 664 degrees on the strong brass meri-dian may coincide with the surface of thebroad paper circle, and this circle will thenrepresent the plane of the ecliptic, as men-tioned in article 103.

Set a small table or a stool over the cen-ter of the chalked circle to represent thesun, and place the terrestrial globe upon itscircumference over the point marked vs,with the north pole facing the imaginaryfun, and the north end of the needle point-ing to the variation : this is the position ofthe earth with respect to the sun at the timeof the summer solstice about the 21 st of June:

and