20
Elements of Pharmacy.
part i.
In De Lisle's thermometer, which is used only in Russia,the space between the boiling and freezing points is dividedinto 150 degrees; the gradation beginning at the boiling point,which is marked 0; and increasing inversely to the freezingpoint, which is marked 150°. It is seldom mentioned byauthors.
These instruments are well adapted for determining the va-riations of temperature which bodies undergo; but a certaindegree of fallacy attends the observations made by them, whichis chiefly owing to the expansion of mercury increasing withthe temperature. Thus, the medium degree of heat betweendie freezing and boiling points, although marked on the scale122°, yet is actually 118-8° 1' only; the temperature which isequal to raise the mercury in the tube 86 degrees in the first
TABLE exhibiting the degrees of the centigrade and Fahrenheit's ther-• nwmeters corresponding to those of Reaumur's thermometer.
Rcau.
Cent.
Fahr.
Rcau.
Cent.
Fahr. |
Reaii. 1
Cent.
Fahr.
80
100-
212-
46
57-5 1
135-5
12
15-
59-
79
98-75 |
209-75
45 1
56-25
133-25 '
\ U 1
13-75
56-75
78 •
97-5
907 -S
44
55-
131-
1 10
12-5
54-5
77
96-25
205-25
4.3
53-75
128-75
9 I
11-25
52-25
76
95-
203-
42
52-5
126-5
8
10-
50-
7.5
93-7.5
200-75
41
51-25
124-25
7
8-75
47-75
74
92-5
198-5
4039
50-
122-
6
7-5
45-5
73
91-25
196-25
48-75
119-75
5
6-25
43-25
72
90-
194-
38
47-5
117-5
4
5-
41-
71
88-75
191-75
37
46-25
115-25
3
3-75
38-75
70
87-5
189-5 ,
36
45-
113-
2
2-5
36-5
69
86-25
187-25
35
43-75
110-75
1
1-25
34-25
68
85-
185-
34
42-5
108-5
0
•0
32-
67
83-75
182-75
33
41-25
106-25
1
1-25
29-75
66
82-5
180-5
32
40-
104-
2
2-5
27-5
65
81-25
178-25
31
38-75
101-75
3
3-75
25-25
64
80-
176-
30
37-5
99-5
4
5-5
23-
63
78-75
173-75
29
36-25
97-25
5
6-25
20-75
62
77-5
171-5
28
35-
95-
6
7-5
18-5
61
76-25
169-25
27
33-75
92-75
7
8-75
16-25
60
75-
167-
26
32-5
90-5
8
lo-
14-
59
73-75
164-75
25
31-25
88-25
9
ll -25
11 -75
58
72-5
162-5
24
30-
86-
10
12-5
9-5
57
71-25
160-25
23
28-75
83-75
11
13-75
7-25
56
70-
158-
22
27-5
81-5
12
15-
5-
55
68-75
155-75
21
26-25
79-25
13
16-25
2-75
54
67-5
153-5
20
25-
77-
14
17-5
0-5
53
66-25
151-25
19
23-75
74-75
15
18-75
1-75
52
65-
149-
IS
22-5
72-5
16
20-
4-
51
63-75
146-75
17
21-25
70-25
17
21-25
6-25
50
62-5
144-5
16
20-
68-
18
22-5
8-5
49
61-25
142-25
15
18-75
65-75
19
23-75
10-75
48
60-
140-
14
17-5
63-5
20
25-
13-
47
58-75
137-75
13
16-25
61-25