(151 
Comparison with the solution of the differential equa- 
tion shows that ©5 = — = nt. 
One of the geometrical equations derivable from the 
figure 1s 
sin je = — p SIN fo — 4 COS po. 
Whence 
dy, Ch 
ec 
— === — 
dt 
Hence when time is measured from the instant when 
the right ascension and east longitude ofthe instantaneous 
axis are both 270°, the solution 1s 
C — A Cnt 
À - ni, D RE 
D =, ; d'imcar Crape: 
Cn £ — A , 
= — tan y sin nt, 
k 24 
Cn C— A 
Here DK AU nt, r=n 
It is interesüing to remark that is an angular velo- 
city a little more rapid than n, ue Se is à slow nega- 
tive angular velocity, the two being so adjusted as to 
maintain à constant angular velocity n about C. 
If w be the resultant angular velocity 
