This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
In the Fahrenheit thermometer, the freezing point of water (actually the temperature of melting ice) is indicated by the number 32, and the boiling point by 312; in the Centigrade instrument, these respective temperatures are indicated by 0 and 100, and in the Reaumur instrument, by 0 and 80. The first-named thermometer owes its system of numeration to G. D. Fahrenheit, a German physicist living in Holland early in the eightjenth century, and elected a Fellow of the Royal Society of London in 1724; the Fahrenheit thermo-meter is used principally in Great Britain and Holland. The Centigrade thermometer, invented in 1712 by Anders Celsius, a (Swede, is the standard instrument for scientific investigations; whilst the Reaumur thermometer, which is the invention of a Frenchman of that name contemporary with Celsius, is used in Germany and Russia, hut is being superseded. On the Continent the Centigrade instrument, which is in popular use there, is known as the Celsius thermometer. To convert F. degrees to C, 5 subtract 32 and multiply by 5/9; for example, 77° F. = ((77 -32)x 5)/9 = 25 C. To convert F. degrees to R., subtract 32 and multiply by 4/9 for example, Tl° F. = ((77-32)x4)/9 = 20 R. To convert C. degrees to F., multiply by 9/5 and add 32; for example, 25° C. = (((25x9)/5)+32) = 77° F. To convert C. degrees to R., multiply by -; for example, 25° C. = (25x4)/5 = 20 R. To convert R. degrees 9 to F., multiply by 9/4 and add 32; for example, 29 R. = (((20x9)/4)+32) = 77° F. To convert R. degrees to C, multiply by 9/4; for example, 20° R. = (20x5)/4 = 25° C. The tables on the previous page provide for the conversion of any degree between the freezing and boiling points of water in any one of the three systems above noted to either of the other systems.
c. | F. | R. |
0 | 32 | 0 |
•5 | 33 | •4 |
1 | 33.8 | •8 |
11 | 34 | •88 |
1.2 | 34.2 | 1 |
16 | 35 | 1.3 |
2 | 35.6 | 1.6 |
22 | 36 | 1.7 |
2.5 | 36.5 | 2 |
2.7 | 37 | 2.2 |
3 | 37.4 | 2.4 |
33 | 38 | 2.6 |
3.7 | 38.7 | 3 |
3.8 | 39 | 31 |
4 | 39.2 | 3.2 |
1.1 | 10 | 3.5 |
5 | 41 | 4 |
5.5 | 12 | 1.1 |
6 | 42.8 | 4.8 |
61 | 43 | 4.88 |
.2 | 43.2 | 5 |
6.6 | 44 | 5.3 |
7 | 44.6 | 5.6 |
72 | 45 | 5.7 |
7.5 | 45.5 | 6 |
7.7 | 46 | 6.2 |
8 | 46.4 | 6.4 |
8.3 | 47 | 6.6 |
87 | 47.7 | 7 |
8.8 | 48 | 71 |
9 | 48.2 | 7.2 |
9.4 | 49 | 7.5 |
10 | 50 | 8 |
10.5 | 51 | 8.4 |
11 | 51.8 | 8.8 |
11.1 | 52 | 8.88 |
11.2 | 52.2 | 9 |
11.6 | 53 | 9.3 |
12 | 53.6 | 9.6 |
12.2 | 54 | 9.7 |
12.5 | 54.5 | 10 |
127 | 55 | 10.2 |
13 | 55.4 | 10.4 |
13.3 | 56 | 10.6 |
13.7 | 56.7 | 11 |
13.8 | 57 | 11.1 |
14 | 57.2 | 11.2 |
14.4 | 58 | 11.5 |
15 | 59 | 12 |
15.5 | 60 | 12.4 |
16 | 60.8 | 12.8 |
161 | 61 | 12.88 |
16.2 | 61.2 | 13 |
16.6 | 62 | 13.3 |
17 | 62.6 | 13.6 |
17.2 | 63 | 13.7 |
17.5 | 63.5 | 14 |
177 | 64 | 14.2 |
18 | 61.4 | 14.4 |
18.3 | 65 | 14.6 |
18.7 | 65.7 | 15 |
18.8 | 66 | 151 |
19 | 66.2 | 15.2 |
19.4 | 67 | 15.5 |
20 | 68 | 16 |
20.5 | 69 | 16.4 |
21 | 69.8 | 16.8 |
211 | 70 | 16.88 |
21.2 | 70.2 | 17 |
21.6 | 71 | 17.3 |
22 | 71.6 | 17.6 |
22.2 | 72 | 17.7 |
22.5 | 72.5 | 18 |
22.7 | 73 | 18.2 |
23 | 73.4 | 18.4 |
23.3 | 74 | 18.6 |
23.7 | 74.7 | 19 |
23.8 | 75 | 191 |
24 | 75.2 | 19.2 |
24.4 | 76 | 19.5 |
25 | 77 | 20 |
C. | F. | R. |
25.5 | 78 | 20.4 |
26 | 78.8 | 20.8 |
26.1 | 79 | 20.88 |
26.2 | 79.2 | 21 |
26.6 | 80 | 21.3 |
27 | 80.6 | 21.6 |
27.2 | 81 | 21.7 |
27.5 | 81.5 | 22 |
27.7 | 82 | 22.2 |
28 | 82.4 | 22.4 |
28.3 | 83 | 22.6 |
28.7 | 83.7 | 23 |
28..8 | 84 | 23.1 |
29 | 84.2 | 23.2 |
29.4 | 85 | 23.5 |
30 | 86 | 24 |
30.5 | 87 | 24.4 |
31 | 87.8 | 24.8 |
31.1 | 88 | 24.88 |
31.2 | 88.2 | 25 |
31.6 | 89 | 25.3 |
32 | 89.6 | 25.6 |
32.2 | 90 | 25.7 |
32.5 | 90.5 | 26 |
32.7 | 91 | 26.2 |
33 | 911 | 26.4 |
33.3 | 92 | 26.6 |
33.7 | 92.7 | 27 |
33.8 | 93 | 27.1 |
34 | 93.2 | 27.2 |
34.4 | 94 | 27.5 |
35 | 95 | 28 |
35.5 | 96 | 281 |
36 | 96.8 | 28.8 |
3fi.l | 97 | 28.88 |
36.2 | 97.2 | 29 |
36.6 | 98 | 29.3 |
37 | 98.6 | 29.6 |
37.2 | 99 | 29.7 |
37.5 | 99.5 | 30 |
37.7 | 100 | 30.2 |
38 | 100.4 | 30.4 |
38.3 | 101 | 30.6 |
38.7 | 101.7 | 31 |
38.8 | 102 | 31.1 |
39 | 102.2 | 31.2 |
39.4 | 103 | 31.5 |
40 | 104 | 32 |
40.5 | 105 | 32.4 |
41 | 105.8 | 32.8 |
411 | 106 | 32.88 |
41.2 | 106.2 | 33 |
41.6 | 107 | 33.3 |
42 | 107.6 | 33.6 |
42.2 | 108 | 33.7 |
42.5 | 108.5 | 34 |
42.7 | 109 | 31.2 |
43 | 109.4 | 34.4 |
43.3 | 110 | 34.6 |
43.7 | 110.7 | 35 |
43.8 | 111 | 35.1 |
44 | 111.2 | 35.2 |
44.4 | 112 | 35.5 |
45 | 113 | 36 |
45.5 | 114 | 36.4 |
46 | 114.8 | 36.8 |
46.1 | 115 | 36.88 |
46.2 | 115.2 | 37 |
46.6 | 116 | 37.3 |
47 | 116.6 | 37.6 |
47.2 | 117 | 37.7 |
47.5 | 117.5 | 38 |
17.7 | 118 | 38.2 |
48 | 118.4 | 38.4 |
48.3 | 119 | 38.6 |
48.7 | 119.7 | 39 |
48.8 | 120 | 391 |
49 | 120.2 | 39.2 |
49.4 | 121 | 39.5 |
50 | 122 | 40 |
C. | F. | R. |
50.5 | 123 | 40.4 |
51 | 123.8 | 40.8 |
51.1 | 124 | 40.88 |
51.2 | 121.2 | 41 |
51.6 | 125 | 41.3 |
52 | 1:5.6 | 41.6 |
52.2 | 126 | 11-7 |
52.5 | 126.5 | 42 |
52.7 | 127 | 42.2 |
53 | 127.4 | 42.4 |
53.3 | 128 | 42.6 |
53.7 | 128.7 | 43 |
53.8 | 129 | 43.1 |
54 | 129.2 | 43 2 |
51.4 | 130 | 43.5 |
55 | 131 | 44 |
55.5 | 132 | 44.4 |
56 | 132.8 | 44.8 |
56.1 | 133 | 44.88 |
56.2 | 133.2 | 45 |
56.6 | 131 | 45.3 |
57 | 134.6 | 4.5.6 |
57.2 | 135 | 45.7 |
57.5 | 135.5 | 46 |
57.7 | 136 | 46.2 |
58 | 136-4 | 46.4 |
58.3 | 137 | 46.6 |
58.7 | 137.7 | 47 |
58.8 | 138 | 47.1 |
59 | 138.2 | 47.2 |
59.4 | 139 | 47.5 |
69 | 140 | 48 |
60.5 | 141 | 48.4 |
61 | 141.8 | 48.8 |
61.1 | 142 | 48.88 |
61.2 | 142.2 | 49 |
61.6 | 143 | 49.3 |
62 | 143.6 | 49.6 |
62.2 | 144 | 49.7 |
62.5 | 144.5 | 50 |
62.7 | 145 | 50.2 |
63 | 145.4 | 50.4 |
63.3 | 116 | 50.6 |
63.7 | 146.7 | 51 |
63.8 | 147 | 511 |
64 | 147.2 | 51.2 |
64.4 | 148 | 51..5 |
65 | 119 | 52 |
65.5 | 150 | 52.4 |
66 | 150.8 | 52.8 |
66.1 | 151 | 52.88 |
66.2 | 151.2 | 53 |
66.6 | 152 | 53.3 |
67 | 152.6 | 53.6 |
67.2 | 153 | 53.7 |
67.5 | 153.5 | 54 |
67.7 | 151 | 54.2 |
68 | 154.4 | 54.4 |
68.3 | 155 | 54.6 |
68.7 | 155.7 | 55 |
68.8 | 156 | 55.1 |
69 | 156.2 | 55.2 |
69.4 | 157 | 55."5 |
70 | 158 | 56 |
70.5 | 159 | 56.4 |
71 | 159.8 | 56.8 |
71.1 | 160 | 56.88 |
71.2 | 160.2 | 57 |
71.6 | 161 | 57.3 |
72 | 161.6 | 57.6 |
72.2 | 162 | 57.7 |
2.5 | 162.5 | 58 |
72.7 | 163 | 58.2 |
73 | 163.4 | 58.4 |
73.3 | 164 | 58.6 |
73.7 | 161.7 | 59 |
73.8 | 165 | 59.1 |
74 | 165.2 | 59.2 |
71.1 | 166 | 59.5 |
75 | 107 | 60 |
c. | P. | R. |
75.5 | 108 | 60.4 |
76 | 168.8 | 60.8 |
76.1 | 169 | 60.83 |
70.2 | 169.2 | 61 |
70.0 | 170 | 61.3 |
77 | 170.6 | 61.6 |
77.2 | 171 | 61.7 |
77.5 | 171.5 | 62 |
777 | 172 | 62.2 |
7S | 172.4 | 62.4 |
78.3 | 173 | 62.6 |
787 | 173.7 | 63 |
78.8 | 174 | 63.1 |
79 | 174.2 | 63.2 |
79.1 | 175 | 63.5 |
80 | 176 | 64 |
80.5 | 177 | 64.4 |
81 | 177.8 | 64.8 |
81.1 | 178 | 64.88 |
81.2 | 178.2 | 65 |
81.6 | 179 | 65.3 |
82 | 179.6 | 65.6 |
82.2 | 180 | 65.7 |
82.5 | 180.5 | 66 |
82.7 | 181 | 66.2 |
83 | 181.4 | 66.4 |
83.3 | 182 | 66.6 |
83.7 | 182.7 | 67 |
83.8 | 183 | 67.1 |
84 | 183.2 | 67.2 |
84.4 | 184 | 67.5 |
85 | 185 | 68 |
85.5 | 186 | 68.4 |
8(5 | 186.8 | 68.8 |
86.1 | 187 | 68.88 |
85.2 | 187.2 | 69 |
86.6 | 183 | 69 3 |
87 | 188.6 | 69.6 |
87.2 | 189 | 69.7 |
87.5 | 189.-5 | 70 |
87.7 | 190 | 70.2 |
88 | 190.4 | 70.4 |
88.3 | 191 | 70.6 |
88.7 | 191.7 | 71 |
88.8 | 192 | 71.1 |
89 | 192.2 | 71-2 |
89.4 | 193 | 71.5 |
90 | 194 | 72 |
90.5 | 195 | 72.4 |
91 | 195.8 | 72.8 |
911 | 196 | 72.88 |
91.2 | 196.2 | 73 |
91.6 | 197 | 73.3 |
92 | 197.6 | 73.6 |
92.2 | 198 | 73.7 |
92.5 | 198.5 | 74 |
92.7 | 199 | 74.2 |
93 | 199.4 | 74.4 |
93.3 | 200 | 74.6 |
93.7 | 200.7 | 75 |
93.8 | 201 | 75.1 |
91 | 201.2 | 75.2 |
94.4 | 202 | 75.5 |
95 | 203 | 76 |
95.5 | 204 | 76.4 |
96 | 201.8 | 76.8 |
961 | 205 | 76.83 |
96.2 | 205-2 | 77 |
96.6 | 206 | 77.3 |
97 | 206.6 | 77.6 |
97.2 | 207 | 77.7 |
97.5 | 207.5 | 78 |
97.7 | 203 | 78.2 |
98 | 208.4 | 78.4 |
98.3 | 209 | 78.6 |
98.7 | 209.7 | 79 |
98.8 | 210 | 79.1 |
99 | 210.2 | 79.2 |
99.4 | 211 | 79.5 |
100 | 212 | 80 |
 
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