An introduction to astronomy: designed as a text-book for the use of students in college. By Denison Olmsted ...

X, GivrC the l'TAmltvrIo N (1).
I1. Square the retardation foir thle distance.
2. Cube the reta trdation tir the rperiod ti 7me.
3. Ta'ke tile fourth power of the retardation for thoe'ec2'0ocal, of ravity.
II. Given thle msmIrsTNcl (I)).
1, TLake its squarle root for reepsrocal of velocity.
2. Take tlte cube of the square root of the distance for tho
perwiodice titRe,.
3. take its squiare for thle recproeaal of gravity.
lIt. Given thle ElR IO1)tI'ri (P).
1. Take tlhe cube root of tlle periodic time for thle 7izw'crocai
of velocity.
2. Take the square of the cube root of the periodic time for
thle distance.
3. Take tile fourth power of its cube root for thle ieciprocal
qf gravity.
JV'. Given thle RECIPROCA oF OAVIXTY (L).
I. Take the fourth root for thle reciprocal of veloity.
2, lake. the square root for the distance.
3.'laket the cube of the fourthl root for the periodic tihme.
YV.,tcquired thle E1:rmocoAxr, o,' vlLrocIrr.
This lmay be o'btained by talking the square root of the dis-
tance, or the cube root of the periodic tihme, or the fourtl root
of the reciprocal of gravity, or l)y dividing the reciprocal of
griavity by the p1eriodic tilnme.
VI. Required the DIS'rANCE.
Talke the square of the reciprocal of velocity, or the square
of thel cube root of the tilme, or tlhe square root of the reciprocal
of gravity, or divide the time by the reciproctal of velocity,
VII. -Reqllired the rlmomol'r1lm.:
T1lake thle cube of the reciprocal of velocity, or thle cube of
thle square root of the distance, or thle A power of the reciprocal
of gravity, or divide the reciprocal of gravity by that of velocity.
VIII. IRequired tile diminishled lwrArITA'IONr.
-Take tile fourthl) powelr of tile reciprocal of velocity, or the
squarel of tile distance, or tle 4 powe4 r of tle time, or imultiply
the timle by the reciprocal of velocity.
According to the foregoing rules, tables may B)e formed, cx