6 z Description and Use of the

through the east and west points of thehorizon. Upon both globes it occasionallyshews the distance of every secondary to thehorizon; and has other uses, which will behereafter shewn.

119. Note, When we speak of bringingany point or place to the strong brass meridian ,we mean that it fould be brought to its gra-duatedfide, which is properly the meridian.

Also, when we speak of bringing the move -able meridian, quadrant os altitude, or anyother thin sexible circle, to any point or place jwe mean that their graduated edges should bibrought to that point, or place.

Of the several circles described uponthe surface of each globe.

120. We may imagine as many as weplease upon the surface of the earth, andconceive them to be extended to the sphereof the heavens, marking thereon concentriccircles.

121. The planes of all great circles passthrough the center, and divide the globe intotwo equal hemispheres: a small circle di-vides the surface of a globe into two unequal

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