354 
ON THE MASS OF A CUBIC INCH OF DISTILLED WATER. 
Final Result. 
The measurements of the sphere S appear to afford more accurate results than 
the measurements of the cylinders. The measurements of the larger cylinder C afford 
a more accurate result than those of the cylinder Q ; although, on the other hand, 
there appears to be less uncertainty as to the volume of the solid quartz cylinder at 
the various temperatures. 
If all the weighings and measurements of the three gravimeters had been of equal 
value, then a mean (252'276) of the three results :— 
C. 252*267 grains 
S. 252*301 
Q. 252-261 
might have been taken as the final result k of the present experiments; but, for 
the considerations above stated, it was thought desirable to take as the final result 
k = C —b 3S+ Q/5, or 252-286 grains ± 0-0002 grain, as the mass of the cubic inch of 
distilled water freed from air, weighed in air at the temperature of 62° Fahr., the 
barometer being reduced to 30 inches, against brass weights of the density of 8 "143. 
A cubic foot of such water under the above conditions would weigh 435950"208 
grains, or 62"278601 lbs. avoirdupois. 
