No. 54900. 



Freezing and Boiling Point Determination. Metalic Thermometers, Air Thermometers. 



581 



54 894. 1 : 2. 



54 897. 1 : 3. 



54 898. 1 : 5. 



54900. 1:15. 



54.890. Thermometer Testing Apparatus, Figure, Budberg's boiling tube with return 

 flow cooling (Ztschr. f. Instrkde. 11, 1891, p. 1), without air chamber 



Thermometer Testing Apparatus, electrically heated, quoted for on application. 

 Reading Microscopes for Thermometers, see p. 226. 

 Thermo-Regulators, see p. 208. 



54.891. Strips of Steel and Zinc, curling when heated 



.">4,X92. --idem, of Steel and Ebonite 



54,893. Strips of Steel and Zinc, with pointer and scale, Figure 



s. d. 

 4.10.0 



54.894. Metallic Thermometer, Figure, Swiss pattern (M. P. III., Fig. 39 [II, 2, Fig. 38]), 

 with maximum and minimum pointers, very reliable ............... 



54.895. -- idem, with electric contact, without maximum and minimum pointers . . . 



J.s'.iG. Metallic Thermometer after Breguet, Figure (M. P. Ill, Fig. 41 [II, 2, Fig. 39]), 

 with platinum silver spiral, with connecting terminals for measuring weak galvanic 

 currents ................................... 



-!, s'.(7. Metallic contact Thermometer, Figure, round pattern, 130 mm diameter, very 



sensitively constructed, with contacts for maximum and minimum registration, from 



- 20 to + 40 C. .............................. 



T.1.S98. -- idem, Figure, range to 100 C 



54,792. Air Thermometer after Galilei (M. P., 10 th Edn. Ill, p. 6; Meyer, Natmi., Fig. 11) . 



54,900. Air Thermometer after Eegnault, Figure (M. P. Ill, Figs. 71 and 72 [II, 2, 

 Fig. 70]), with unscrewable air chamber, fittings well constructed of steel, wood frame 



Cl. 1722, 



1721, 4008, 



0. 3.0 

 0.16.0 



1.16.0 

 2. 5.0 



! 2. 6.0 



1.10.0 

 1.16.0 

 0. 2.8 



4.10.0 



5418, 1724. 



