146 Chemical Examination 
each spring may have one-half less mass than if, being sii 
gle, its height were double; and in order that, this mass 
being more equally distributed around the centre of motion, 
the regulator might not be exposed to gain or lose by lateral 
shocks. The-advaniages of this a ey have been confirmed 
to me by a number BF experiments. : 
By means of these precautions we may turn the watch ra- 
pidly, or make it vibrate quickly on its suspension, without 
any sensible difference resulting in the arcs of vibrations. 
There is but one foreign motion that can derange it ; and 
that is the one which it may receive circularly on the axis 
of its regulator. But the machine being adapted to the vessel 
by means of four fastenings, fixed at the bottom of the box, 
it is impossible that it can receive any thing of the kind, 
Moreover, I have thought it best (on the authority of 
what has been observed by M.1’abbé Chappe, and on what 
has been said by M. Bouguer, p. 214 of the Manewvre de 
Vaisseuux, that the inclination of a ship is much too great 
when it is from 18 to 20 degrees,) to dispose my machine, 
not for inclinations which rarely take place, but for a mean 
term. It has therefore the liberty of describing on. its sus- 
pension, and in its box, only 15 or 16 degrees ; this may 
go as far as 18 or 20 by the giving way of the cushions and 
pad, if the weight of the watch press them any time. 
[To be continued.] 
XXV. Chemical Examination of the native Cinnabars of 
Japan, Newmarktel, and Idria. By M. Kvarrotu*. , 
as 
Tue cinnabar of Japan, which is brought to Europe in 
crystallized grains, is of a deep cochineal red, inclining to 
steel gray ; and in other places it is of a scarlet red, iadlipes 
ing to brick colour, fe 
There are fragments of flat hexaédral prisms, outwardly 
very smooth, .of a metallic lustre, inw ardly very brilliant, 
and semi-metallic. 
* From Annales de Chimie, tome lviil. p. 303. 
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