OF METEOROLOGICAL INSTRUMENTS. 



51 



223. Alpine Maximum and Minimum Thermometer, divided on the stems, on 



polished boxwood, in pocket case, very portable and convenient (fig. 47), p. 16 



150 



224. PORTABLE MAXIMUM AND MINIMUM THERMOMETER, on metal scales, larger size, 



divided on the stems, as arranged by L. CASELLA for Dr. Livingstone, and 

 Captains Burton, Speke and Grant, in mahogany case . 220 



225. Maximum Thermometer, as designed by L. CASELLA for the Alpine Club, divided 



and figured on the stem ..... 10 6 



226. MINIMUM THERMOMETER, ditto, ditto 



086 

 076 



227. PLAIN THERMOMETER, ditto, ditto .... 



The three in small mahogany case, 1 10s. 



228. SOLAR RADIATION MAXIMUM THERMOMETER, black bulb, figured and divided 



on the stem , . . . . , 11 6 



229. ALPINE HYGROMETER, wet and dry bulb, in morocco case, 6 inches long by 



2 wide, and 1 inch deep . . . . .220 



230. RAIN GAUGE, as arranged for Dr. Livingstone, 3 inches in diameter 17 6 



Other instruments for travellers. See Aneroid, No. 112, etc. j Pocket Hypsometer, No. 86 ; 

 Pedometer, No. 124 ; Altazimuth, No. 521 ; Chronograph, No. 126, Nos. 8, 502, and pages 66, 

 67, 68, 69, 70, etc., etc. 



CHEMICAL AND MANUFACTURING THERMOMETERS. 



The scales of these thermometers are either etched upon the glass stems, or they are 

 written on paper or milk glass, enclosed in glass tubes, without fittings of metal or 

 wood, so that they can be safely immersed in hot, caustic, or acid liquors (fig. 242), p. 52. 



The loivest point on the scales of these thermometers is generally about 40 or 30 

 Fahrenheit. The highest point to which each ranges, as cited below, is approximate. ^ 

 It may range a few degrees above or under the quotation. 



Thermometers with long scales (or wide spaces between the degrees) cost Is. to 

 Is. 6d. extra. 



Cardboard boxes for the thermometers are included in the following prices : 



The thermometers Nos. 233, 235, and 236, have narrow cylindrical bulbs, to enaMe them to lo 

 passed through corks for insertion into retorts, etc. 



E 2 



