568 



Heat. 



No. 54 793 



A). 



54 795. 1 : 8. 



54 799. 1 : 8. 



54 802. 1 : 5. 



54 800. 1 : 8. 



54.793. Thermoscope after Drebbel. for showing the expansion of gases, Figure, consisting 

 of a bulb, with tube attached, the former half-filled with a liquid, length of tube 75 cm, 

 with graduation (Fr. Phys. Techn. I, 2, Fig. 2848) ................ 



54.794. Tyndall's Apparatus for showing the Expansion of Gases, F i g u r e (Tyndall, Die 

 Warme. Fig. 43, 1894) ............................. 



Prom the boiling fla'jk, tilled with air, a small tube leads into a wider, shortened barometer tube 

 (to be filled witfi coloured water) clamped on the same stand. If the air in the flask is heated it expands 

 and rises in bubbles into the barometer tube. 



54.795. Contraction Apparatus alter Tyndall, Figure, for demonstrating expansion by 

 heating and elementary force on contraction by cooling (M. P. II, Figs. 34 and 35 [II. 

 2, Figs. 32 and 33]), with 12 cast-iron rods . . . . ....... " ...... '. . 



A 9 mm thick cast-iron rod is fractured by the roiicra -lion of a thick square-section rod after 

 heating. For Bunsen Burners and Heating Stand, see following items. 



54.796. 4 Bunsen Burners, arranged in a row, for heating the iron bar ................. 



"i4.7!(ti a. Simple Stand on which to set the iron bar while heating, together with wire stirrup for supporting 



the bar ........................................... 



M.T'.t". Contraction Apparatus with Fletcher Burner, for use without heating stand . . . 



54.798. Contraction Apparatus after Tyndall, as No. 54,795, but double the size ..... 



51.799. Pyrometer. F i g u r e (Kr. phys. Techn. I, 2. Fig. 2990 | I, Fig. 337]), for demonstrating 

 linear expansion, with three bars of brass, iron and /inc; with gas burner, graduation 



s. d. 

 0.10.0 



1. 0.0 



n 



;, 



mm (dan. -Man. Fig. 460: Can. -Rein. Fig. 298) 



54.800. --id e m, F i g u r e, with Spirit Burner 



54.801. 3 Bars for .Nos. 54,799 and 54,800, of Copper, German Silver, and Aluminium 



01. 



Compensating Pendulums: see Nos. 01,01)0,7 and ol,7U3. 



5772. liifit. 

 1667 ', 



0. 14. 



(I. 14. u 



0. 4. II 



1. 0.0 

 1.16.0 



1. 8.0 

 1. 8.0 



0. 3.0 

 618*, 



5413, 

 1667. 



