No. 54957. 



Thermoscopy. 



589 



54 955. 1 : 6. 



54957. 1:14. 



54,955. Double Thermoscope after Looser, Figure, for a large number of experiments s. d. 

 on heat, electricity, etc. (W. D. Fig. 32? [309]; Ztschr. f. d. phys. u. chem. U. 8, 

 p. 291; 9, p. 265; 11, p. 105; 15, p. 257; 19, p. 333 ; Looser, Versuche aus der Warme- 

 lehre und verwandten Gebieten) - ; 2.10.0 



The apparatus consists of two manometers filled with coloured liquid, the long limbs of which 

 are carried upwards quite parallely. A scale graduated in half centimeters admits of easy reading for 

 the students; the lecturer himself can observe the height of the liquid on a second scale at the back. 

 The shorter limbs of the manometer are cut off by wider vessels each having a cock and an attachment 

 for rubber tubing. By means of the rubber tubing the sensitive air capsules (receivers) are connected 

 with the manometers. The air capsules are constructed in suitable forms for the various experiments 

 (see below). 



The following experiments can be carried out with the apparatus when use is made of the acces- 

 sories pertaining thereto which should be selected from Nos. 54,956 54,972: 



D. 



Expansion of Bodies, 



Specific Heat and Atomic Heat, 



Thermal Conduction in Solids, Liquids and 



Gases, 

 Radiant Heat, 



E. Heat and Work, 



F. Heat on change of state, 



G. Heat by Compression of Gases and Vapours, 

 II. Heat during Chemical Reactions. 



I. Thermal Effects of the Electric Current. 



In addition the apparatus can be used as a Manometer. 



We supply with the apparatus two capsules with ccm graduation for liquids, two wide and four 

 narrow glass beakers, one scourer, one bottle of filling liquid, two pieces rubber tubing. 



The accessories are set forth in accordance with definite series of experiments in such manner 

 that under a List No. always all the objects necessary for the series of experiments are listed irrespective 

 of whether they are mentioned again previously or subsequently. 



In subsequent orders it should be stated paying due attention to what has been said above - 

 whether such accessory parts are already available, in case it is not desired to duplicate them in the 

 collection. The items marked \ are also contained in the "Small Collections ef Accessories" mentioned 

 for the second time. 



The Figure Numbers in brackets appended to the accessories refer to the "Introduction" No. 54,956. 



54.956. Introduction to above (Looser, Versuche aus der Warmelehre und verwandten Ge- 

 bictcn, mit Benutzung des Doppel-Thermoskops), 3 th Edn., 148 pages 0. 4. 6 



54.957. Accessories for Experiments on Thermal Expansion, Figure (Experiments Nos. 1 9) 3. 4. 



For experiments on the dilatation of vessels and rods, the floating of heated liquids on colder 

 <>nrs. the irregular dilatation of water, change of volume and convection. 



1 Boiling Flask, 1 litre, with tripod, cork, and 



connecting tube (Fig. 2). 



1 porous Pot with tube connection (Fig. 46). 

 1 Sheet Iron Box with corrugated lid, with stand, 



test bars of brass and glass (Fig. 3). 

 1 indicating Device. 



1 Gauge Glass. 



2 Capsules weighted with shot (Figs. 4 and 31). 



1 Standing Vessel of Zinc with 5 openings and 



2 spherical air capsules (Fig. 5 and p. 14). 



2 large Hemispheres of glass with bent tube 



(Fig. 6). 

 2 Pasteboard Cylinders with stand and beaker 



(Fig. 7). 

 2 large Hemispheres (glass) with straight tube 



(Fig. 7). 

 1 Rod with ring (p. 16). 



54.95, a. Small Collection of Accessories for Experiments on Thermal Expansion (for Experiments Nos. 1, 2, 

 3, 4 and 6), consist ins solely of the accessories marked j in No. 54,957 



0. 8. 



Cl. 1754, (U89. 



