450 FE. Hungerford—Observations on Snow and Ice 
Tabular Exhibit of Observations on Snow. 
Temp Pressure 
‘| B. | Time. | to feo Result. 
ss © tees 8 242 Gray ice, imperfect. 
2} 32 2°5m.| 950-1275) Sub-vitreous, sub-granular, gray ice. 
3| 32 3 m. Gray ice, oo erfect. 
4| 29 3m. | 950-1275) now and coarse granular, very good ice. 
5} 276 | 1m. 580 Hard but ate dt reset 
6} 26 1 m. |1475-1975)§ vitr nular 
7) 26 j24h. | 950-1275)" “ery perfect, ‘pees png ice. 
8} 25 1} h. |1475-1975 ven per rfect ice. 
9 245 10m 580 |Sub-vitreous, 
0} 23°25'20 m 975 Sub-vitreous, ash sub-gran 
] 2 
. {1475-1 
0m. /1100-1465).In ve min nine Sega aareery " plachatites — 
12}. 22 3h. 950-1275 Vitseons, ae translucent ice character well ad- 
need. 
13} 21 (45m. | 950-1275 ade rather 
14| 20 2m. | 950- re Sul-vitreons oT granular, pure white, 
15} 20 (10m. | 575- 7 ee oe granular. 
16} 20 | 3h. |1200— ibe Goo i 
17} 18 (24h. 1693 |True ios bet not as perfect as some. 
18) 15 j21h 4122 ect gray ice uniform eto out. 
19) 9 22h. |1475-1975| Change manifest in two hours and in ten hours 
a nS was far saieeed. | sre! gray ice. 
20; 7 (|47h. (1475-1 1975 i 
21; 4 5h, eet fighiy vitreous bon melts with only slightly gran- 
ney 
S2p 3). HO 8 | Perfe 
Za, 42s 14h, ee yt Perfe d ice 
24) 0 (23h, Remarkably clear fi 
25) —2 2h. 1415-197 5| Highly wiretia fartaea advanced than No. 21. 
If, with the above explanations in view, we direct our atten- 
tion to special portions of the table, we find, in the first place, 
that at 32° F., with a very moderate pressure, a gray ice may 
be obtained in a one to three minutes; and no marked 
difference is observed between ice produced under an extreme 
pressure of 250 rain to the square inch, and that produced 
under higher shah se 
perature, fails in so short a time to produce 6 parfens Jc oe 
in No. 7, at the same tem bectare; under fe ioe pheniin we 
get in 24 aed “ very perfect, pretty clea 
_ At 25° F. No. 8 gives us very perfect i in an hour and a 
half under a poeta of from 1475 pounds to 1975 pounds = 
square inch; and still better is No. 11 in which, at a tempera 
ture of 28°, and under a pressure ranging from 1100 pounds to 
1465 pounds to the square inch, we get a nearly eg ioe gla- 
