No. 54 814. 



Coefficient of Expansion. 



571 



54 813. 1 : 6. 



54 814. 1 : 6. 



54,810. Apparatus for determining the Linear Expansion Coefficient of Bars, after Lavoisier 

 and Laplace, for mirror reading, Figure, with heating apparatus and water jacket, 

 with inlet pnd outlet for cooling the frame (W. u. E. phys. Prakt., Fig. 91; M. P., 9 th Edn., 

 II, 2, Figs. 28 and 29) 



Given in as test pieces are bars, 0.5 m long, of copper, iron, glass, and ebonite (the latter 

 resting on a somewhat shorter glass rod). 



54,811. - - idem, with Micrometer Reading, 

 bath and one thermometer to 250 C. . 



Figure, with heating apparatus, copper 



The apparatus is easy to manipulate. The alterations in length are read off on the micrometer 

 direct to 0.01 mm. We supply as test pieces rods, 0.5 m long, of iron, copper, zinc, brass, glass, and 

 aluminium. 



54.812. Apparatus for shewing the Contraction of an expanded Rubber Tube by Heat, Figure 

 (W. D., Figs. 335, 336 B [316, 317 B]), comprising rubber tubing with hooks at the 

 ends, balance pan, and steam conduit pipe 



The accessories illustrated, i. e., steam boiler with stand, tackle, and weights, are not included 

 in the price. Price of Boiler and Stand 1. 13. 6; Balance Pan No. 52,216, 0. 6. 0. 



54.813. Dilatometer. Figure (Chwolson, Lehrb. d. Phys., Vol. Ill, Fig. 39), for deter- 

 mining the cubical expansion coefficient of solids, with iron bar 100 g weight . . . 



54.814. Weight Dilatometer, Figure, for determining the cubical expansion coefficient of 

 liquids and glass (W. u. E. phys. Prakt., Fig. 92) 



s. d. 



7.10.0 



12. 0.0 



1. 6.0 



0.12.0 



0.10.0 



Cl. 1676, 

 3963, 1679. 



