under pressure at Temperatures below 32° F. 443 
utes, or, on an average, a revolution in 18 minutes. But as 
there was, doubtless, a pause of several minutes between each 
he Pea of the snow. In this respect the trial under 
tions of power dine hier 5 aed The weight was in- 
creased very gradually (no hand power being used) three 
pounds to start with equals about 400 lbs. pressure, under 
which of course the lightly packed snow was yielding; then 
two pounds, etc., until, only at the last, increments equal to 
from 400 to 550 Ibs. effective pressure were use 
In the fourth trial, beginning was made with only one lb. 
power, and increase made 1 up to 25 lbs. pow 
The times also vary in the td trials, 2 this fact has its 
ua 
lence the conditions and results of these four trials may be 
grouped together as follows: 
° High’t | Duwation = | Resulting 
Date. T = at of Exp. Increments of Effective Pressure. Condition. 
Dee. Monts small by hand, total 3,068 to squ. 
1 |29, °70| 3° F.|10 hours} inch. Perfect ice. 
Jan. Small by hand at first, then 346 Ibs. — Most perfect 
2/4, °71/15° F.|21 hours) gradually to “egg 4, ha lbs. to squ. i ice. 
Jan. 375 Ibs., 250 lbs., 400 to a Ibs., totail Remarkably 
0° F.)23 aeniel phsg square inch, Pe 13 clear ice. 
Jan. 0 lbs. with a additions a: total of 1,693|Upper part of 
4 |18, °71/18° F,|24 h’s+ gets square inch. mass true ice. 
w 
a) 
a 
— 
From this table and ae preceding explanations, the follow- 
ing conclusions are reac 
(1. may ee care into ice under pressure at a 
temperature as low a 
required to complete the process, “under a very slowly applied . 
pressure and with gradual increments, until the total reach 
sasalianity of ice and snow under pressure. When a prism a 
cold ice is placed in the clamps and any given amount of pres- 
