Review of the Results of the U. S, Coast Survey. 75 
angular motion of the axis plays the same part as the sustaining 
agent, and has the same analytical expression. Owing to friction, 
€ top likewise rises, and soon attains a vertical position; but 
the agency by which this effect is produced is not exactly the 
same as for the gyroscope. : 
If the extremity of the top is rounded, or is not a perfect 
a of Testing permanently on the surface, will strike wt, at each revo- 
. lution, and in so doing, propel the extremity along, The condi- 
= 
g 
=] 
Ds 
CORRECTION. : 
«it the No. for July, 1857, vol. xxiv, No. 70, p. 65, 8th line of note, for 
Vertical,” read “horizontal,” and for “horizontal,” read “ vertical. 
10th line, for “the first,” read “the second.” 
ren 
Arr. XI.— Review of the Operations and Results of the United 
States Coast Survey. 
_ Txoven the annual reports of the United States Coast Sur- 
vey have been frequently noticed in this Journal, no general 
nO adequate idea of the real magnitude and ee “ ee 
e 1 attentive and well repaying stu 
are apt in the = ae 
