^6 Description and Use os the

Note, As this circle occasionally repre-sents various great circles of the sphere, wehave given it the name of broad paper circle,to prevent the reader from considering it asan horizon, when it really represents theplane of the earth’s illuminated disc, &c.

The north-lide of the wooden frameought to be placed directly towards thenorth-fide of the heavens, which is readilydone by the mariner’s compass under ournew globes.

The strong brass circle, or meridian,NZÆSN.

104. There are two notches in the broadwooden circle (art. 97.) upon the plane ofwhich the broad paper circle is placed, whichreceive the strong brass circle: the body ofthe globe, being suspended at two oppositepoints in this circle, turns round therein onits iron poles, one of which N represents thenorth, and the other 8 the south pole.

105. One side of this strong brass circleis graduated into four quadrants, each con-taining 90 degrees. The numbers on twoof these quadrants increase from the equa-tor