_ the yellow, insulated by the same, being marked 3; the inter- ‘ 
224 Prof. Draper's Description of the ‘Tithonometer. 
0 two equal spaces, and divisions © 
=e the phenomena of different cle 
haps the most Gale mode is to affix t 
Thus I found that a piece of colorless Si, re 
nitted 866 ale out of 1000. 
Description of the iument First, of the glass part.— 
The tithonometer consists of a glass tube bent into the form of — 
a siphon, in which chlorine and hydrogen can be evolved from — 
muriatic acid, containing chlorine in solution, by the agency ofa — 
voltaic current. It is represented by fig. 1, where a bc is aclear 
and thin tube four tenths of an inch so ae diameter, closed at — 
the end a. At dacircular piece of metal, an inch in diameter, ” 
which may be called the stage, is fastened on the tube, the dis- 
tance from d toa being 2-9inches. At the point 2, which is two 
inches and a quarter from d, two platina wires, « and y, are fused 
into the glass, and entering into the interior of the tube, are des- 
tined to furnish the supply of chlorine and hydrogen; from the 
stage d to the point 6, the inner bend of the tube, is 2°6 inches, © 
and from that point to the top of the siphon c, the distance is 
three inches and a half. Through the glass at z, three quarters 
of an inch from c, a third platina wire is passed; this wire termi- 
nates in the little ne cup r, and # and y in the cups p and — 
qg respectively. | 
Things being thus sieataed, the instrument is filled with its — 
fluid prepared, as will presently be described; and as the legs ab, ~ 
be, are not parallel to each other, but inelude an angle - few = 
degrees, in the same way that Ure’s eudiometer is arranged, there — 
is no difficulty in transferring the liquid to the sealedleg. Enough 
is admitted to fill the sealed leg and the open one partially, leaving 
an empty space to the top of the tube at ¢ of two and three —_ 4 
ter inches. : | 
