V... .',3076. 



Auxiliary Apparatus for Air Pumps. 



405 



53070. 1 : 3. 



53072. 1 : 8. 



53 071 and 53 019. 1:8. 



53073. 1 : 8. 



53074. 1 : 4. 



53.063. Fall Tube after Puluj, Figure, evacuated and scaled up, 90 cm high, with base 1. 



An electromagnet is placed above the upper. end and when the current is closed this magnet 

 holds fast a small iron disc and a down feather provided with a light iron wire. When the, current 

 is opened both bodies drop simultaneously, reaching the bottom at the same time. 



53.064. - - idem, not evacuated, for showing, along with No. 53,063, the behaviour of the 

 two bodies in an air filled space 1. 



s. d. 

 10. 



8. 



53.065. - - i d e m, with stopcock, for evacuating on the spot, for showing the fall in air and 



in vacuo 1. 



53,066. Wind Fan, for air resistance, F i g u r e (W. I). Fig. 174 [159]) . . . 



0. 



53,067. Double Fan, with two adjustable vanes, set into uniform rotation by two heavy racks, 



F i g \\ r e j 1. 



52,667. Cohesion and Adhesion Tube after Leduc and Sacerdote, see No. 52,667, p. 361 . 0. 



53,069. Bell with clockwork, for showing the small extent of the propagation of sound in 



rarified air 0. 



No. 53,069 can be used with the small Stuffing Box Receiver No. 53,017; the largest receiver, 

 No. 53,019, is required for Nos. 53,07053,071. 



>3,070. - - idem, hung with three cords in iron frame having rubber feet, Figure, for 



damping as far as possible the transmission of sound to the air pump 0. 14. 



12. 

 15. 



10. 

 12. 



10. 



i,071. -- idem, with visible clockwork, suspended by means of fibres, Figure, with- 

 out receiver . 1. 



53,072. Electric Bell in a receiver, suspended from rubber, Figure (M. T. p. 123) . 



0. 



0. 



11'. 



53.073. Apparatus for forming ice by evaporation of ether, F i g u r e, after Bottgor (W. V. 

 Fig. 409), without receiver 0. 



53.074. Freezing Apparatus after Cane, Figure (W. D. Fig. 391 [371]), for producing 



ice by evaporation, with enclosed ether vessel, on stand ' " 



53.075. -- idem, with stand, but without ether glass (W. D. Fig. 390 [370]) 0. 



53.076. - - id e in, for placing direct on the air pump plate, F i g u r e (W. D. Fig. 392 [372]) 0. 



Ol. 980, 5991. !I82. 

 5312, 993, 994. 



11. 



9. 



10. 



