J. M. Ordway on Waterglass. . ree ° 
NaO at 64°9°, so as to pe ae Si,. The thermometer then stood 
at 67:3°, making a rise 0 
c. Some of the Hear ai of b at 64°6° F. was mixed with half 
its weight of a 10 p. c. soda solution at 64°9°. It rose to 65°4°, making 
an elevation of 0°7° F. 
eckoning the i bee =e hie case as Sprig only the Ss Shave 110g. 
of silicate, the rise in ould be 21°37° F. In 82a, ould be 
17-82°, and in 8 it sae amount to 3 5 or in both ‘igen 21 "36°. 
In 82 ¢ it would be only 1: 
This heating by no means arises from simple vipseong: 
for dilution of the same waterglass with mere water, causes eve e 
more contraction. Thus: 
33 a narrow necked 100 ¢. ¢. bottle containing 50°616 g. of 47 
p- c. NaO.2-48i0, of sp. gr. 1°558, was cautiously filled u up. with water. 
It was then closed and well agitated and there was a striking decrease a 
of volume. Water was added once or twice with farther agitation till it i 
stood at the right level at the gfe temperature. 68°88 g. of water . 
had been put in, and the sp. gr. w 1-474. Calculation shows that 
instead of 100 c. ¢., it should have hinian 101°36 ¢. ¢. So the con- 
traction amounted to 1°34 p.c. 
6. 110 g. of the 47 p.c. waterglass were mixed with 90 g. of caustic 
soda liquor of sp. gr. 1164. The sp. gr. was now 1°363, and therefore 
ed to 
¢. The liquor of 6 being aedier | sieve with 125:2 g. of caustic soda 
cs the whole bulk was diminished 0°5 p. ¢ 
e total contraction in both sot amounted to 0°95 p- ¢. of what 
the Se irarate volume should have bee 
‘Though condensation results be the dilution of waterglass 
with water, it is a remarkable fact, and, as far as I can learn, one 
that. has hitherto remained unnoticed, that there is at the same 
time a positive reduction of temperature. 
34. 110g. of 47 p.c. of NaO.2°4Si0, at 63°6° F., were mixed with 
eer of water at 63:4°. The temperature fell to 61° 9°, making a fall of 
6° F. 
0 g. of b at 61°3° were coal with 50 g. of water at 61 “4°, 
It fall om ‘6 a making a fall of 0°45° F. 
Bringing all to the same standard by reckoning the reduction of tem- 
ns as concentrated in 100 g., the ay in a would be 1°5°; in 8, 
174°; in c, 112°; and in 34 it would be 2°9° F. 
It n sais @ more extensive icon than has yet been 
Ss made, to show wade this unaccountable behavior is pee 
to waterglass. Me tastannate of potash is neither ted 
cooled by dilution. Nor is the treatment of the metastanmate, 
With caustic potash liquor attended with any more elevation of — 
tan 4 hic er 
ola ae be due to the Page pee W) 
