45, CORNHILL, B.C., AND 122, REGENT STREET, W., LONDON. 169 



Each. Each. 



s. d. s. d. 



377 Oil Testing Thermometers, for testing the Heat of 



Bearings, the Lubricating quality of Oils, &c., made 



to Order and Drawings. 



378 Thermometers for Hot Rollers, ditto ditto 



379 Salinometer Thermometer. See Salinometer . 066 

 378* Stout Copper Trial Pots for ditto, with division . 086 

 379* Disinf ecting Thermometers, for Hospital, Workhouse, or 



Mortuary use, simple form, (fig 379) . . . 16s. 150 1 16 



380 Ditto ditto, Bent form, of any length of Tube or Scale 



to special Order and drawings. 



381 Reference Standard Thermometers. See page 158, fig. 282, 



and page 32 . . . . . . . from 220 



382 Hydrometer Thermometer, with Ivory Scale . 076 



383 Saccharometer Thermometer, with Expansion Scale on 



Silvered Metal (fig. 348) ...... 14 



384 Incubating Thermometers, Low range on long Metal Scale 98 to 100 036 



385 Ditto ditto, High range, Short Metal Scale 190 to 210 . .036 



386 Ditto ditto, Low range divided on the Stem 90 to 130 . .026 



387 Ditto ditto, High range divided on the Stem 150 to 220 .036 



388 Ditto ditto, 8-inch Metal Scale Thermometer, in japanned case 026 



389 Ditto ditto, 10-inch ditto ditto, without case . . .036 



390 Ditto ditto, Small Bent Tube in Metal Mounting . . .046 



391 Incubating Thermometers, extra sensitive, for Experimental purposes. 



Made to order. 



392 Thermometers, Extreme Low range, for Refrigerating Chambers, ditto ditto. 

 391* Petroleum Testing Thermometers (fig. 391*) 10 6 



393 The Elaeometer, for testing Olive oil or Oil of Almonds. The O at the bottom 

 of the scale is the point at which this instrument floats in Pure Oil of Poppy Seeds. 

 The point at which it floats in Pure Olive Oil is made the 50th degree, and the 

 space between these two points is divided into 50 equal parts and numbered 

 accordingly. It floats at 38 or 38| Q in Pure Oil of Almonds. Price, 5s. 6d. 



394 COMPARISON OF THERMOMETER SCALES. 



Fahrenheit. Centigrade. Eeaumur. 



4-212 +100'0 + 80'0 



100' 37-8 30-2 



50' 10- 8-0 



32- 0-0 0-0 



-i-10- -12-2 -9-8 



0- -17-8 -14-2 



-10- -23-3 -18-6 



-20- -28-9 -23-1 



-50- -45-5 -36-4 



-70- -56-6 -45-3 



Value of one degree of these Scales. 



1 Fahrenheit = Centigrade = % Reaumur 

 1 Centigrade = 1-8 Fahrenheit = 0'8 Reaumur 

 1 Reaumur = 2-25 Fahrenheit = 1-25 Centigrade 



Elementary Meteorology, B. H. SCOTT, F.R.S. 



