Page:Encyclopædia Britannica, first edition - Volume II, C-L.pdf/643

Rh  from us, have, and every other , an ooner than we have. They whoe is fifteen s wetward from us, have, and every other , an  later than we have: and o on in proportion, reckoning one  for every fifteen s.

For the, , and s, ee ,.

The  are leer s in the, parallel to the ; one on each ide of it, touching the in the points of its greatet ; o that each  is 23 s from the , one on the north ide of it, and the other on the outh. The northern touches the  at the beginning of, the outhern at the beginning of ; for which reaon the former is called the  of , and the latter the  of .

The   in the, are each 23 s from the s, all around. That which goes round the, is called the . The, is called the , from its being oppoite to the.

The, , and -s, are drawn upon the terretrial , as well as upon the celetial. But the, being a great fixed in the , cannot properly be aid to belong to the terretrial ; and is laid down upon it only for the conveniency of olving ome problems. So that, if this on the terretrial  was properly divided into the s and s of the, it would not only uit the  better, but would alo make the problems thereon much eaier.

For the ’s motion round its every 24 s; its motion in the  round the  every ; and the viciitude of ; ee,.

  Decription of the Terretrial Globe. [See Plate XLIV. fig. 2.]

 The, , and , , and s, are laid down upon the in the manner already decribed. The is divided into 12, and each  into 30 s. Each  is 23 s from the , and each  23 s from its repective. s are drawn parallel to the, at every ten s ditance from it on each ide to the s: thee s are called parallels of . On large s there are s drawn perpendicularly through every tenth of the, interecting each other at the s: but on s of or under a foot , they are only drawn through every fifteenth  of the ; thee s are generally culled , ometimes s of , and at other times -s.

The is hung in a -, called the , and turns upon a  in eace  unk half its thicknes into one ide of the  ; by which means, that ide of the  divides the  into two equal parts, called the eatern and wetern hemipheres; as the  divides it into two equal parts, called the northern and outhern hemipheres. The is divided into 360 equal parts or s, on the ide wherein the  of the  turns. One half of thee s are ed, and reckoned, from the to the s, where they end at 90: their ue is to hew the s of places. The s on the other half of the  are ed from the s to the, where they end at 90: their ue is to hew how to elevate either the  or  above the , according to the  of any given place, as it is north or outh of the.

The is let into two notches made in a broad flat, called the en ; the upper urface of which divides the  into two equal parts, called the upper and lower hemipheres. One notch is in the north point of the, and the other in the outh. On this are everal concentric s, which contain the s and s of the, the  and s anwering to the 's place for each  and , and the 32 points of the .&mdash;The graduated ide of the  lies towards the eat ide of the , and hould be generally kept towards the peron who works problems by the s.

There is a mall  , o fixed to the north part of the, that the in the  of the  is in the centre of that ; and on the  is an index, which goes over all the 24 s of the , as the  is turned round its. Sometimes there are two s, one between each  of the  and the.

There is a thin lip of, called the  of , which is divided into 90 equal parts or s, anwering exactly to o many s of the. It is occaionally fixed to the uppermot point of the by a  and. The divisions end at the, and the is turned round upon it.

 The Decription and Ue of the . [See Plate LXXXVII. Fig. 1.]

  exterior parts of this are, a compages of  s, which repreent the principal s of the, viz. 1. The A A, which is divided into 360 s (beginning at its interection with the  in ) for hewing the 's  in s; and alo into 24 s, for hewing his  in. 2. The B B, which is divided into 12, and each  into 30 s, and alo into the s and s of the ; in uch a manner, that the  or point of the  in which the  is, on any given , tands over that  in the  of s. 3. The  C C, touching the  at the beginning of  in e, and the  D D, touching the  at the beginning of  in f; each 23 s from the. 4. The E, and the  F, each 23 s from its repective  at N and S. 5. The G G, paing through the  and  of the  at N and S, and through the  points  and, in the. 6. The H H, paing through the s of the  ,