570 



Heat. 



No. 54807 



54 808. 1 



54 810. 1 : 6. 



54 812. 1 ; 20. 



54,807. Tube Expansion Apparatus after Friedr. C. G. Miiller (M. T. Figs. 101 and 10-'), suitable 

 for observations at great distances 



s. d. 

 3.12.0 



54.808. Apparatus for the Linear Expansion of Steel and Zinc after Borda (Dulong and Petit), 

 by the differential method, Figure, with two bars 120 cm lotiu. '_'."> mm wide, and 



4 mm thick (M. P. Ill, Fig. 32 [II, 2, Fig. 30 ]) . ... j 3.12. 



54.809. - - ide m, smaller, with 6 bars of iron, brass, copper, /inc. aluminium, and (iernian 



Silver, Figure, with two thermometers to + 240C. and Stirrer 6. 0. 



The apparatus consists of a copper hov in which the bars to be compared rest on fillets. These 

 bars arc pierced at one end so as to enable them to be firmly connected by a bolt; at their tree ends 

 they ca'Tv rectangular attachments allowing them to project out of the bath as shown in the Figure. 

 On the upper sides of these angle pieces are placed graduations. Accurate reading with a vcrni'T 

 can lie made since the comparison bar (of iron) ha- a millimetre graduation - J(I mm long and the ba-s 

 to be compared are scaled ]!> in long with 20 divisions. 



Cl. 1673. 

 1074, 

 3411, Ifl77. 



