No. 52821. 



Boyle's (Mariotte's) Law. 



379 



i 



52 816. 1 : 20. 



52817. 1:9. 



52818. 1:12. 



52820. 1:12. 



52 8J51. 1 : 1U. 



stopcocks. The scale is visible at a considerable distance, 

 used to 2.5 atm. 



With both limbs the apparatus can be 



52.817. Boyle's (Mariotte's) Law Apparatus, after Huber, Figure, on iron stand and wood 

 board, with two-coloured scale; can be used as an Air Thermometer 



The pressure tube has a scale 1.10 m long with millimetre graduation and with black and white 

 centimetre graduation visible at a considerable distance. The short arm has a graduation on glass, 

 contains a thermometer closed by the upper aperture which must be pocked with mercury, and is en- 

 closed in a cylinder of large diameter so that a uniform temperature of the gas to be investigated 

 is maintained by a current of air or the like. 



52.818. Boyle's (Mariotte's) Law Apparatus, Figure, small pattern, with fixed glass tube, 

 1 stopcock on the lower end, 1 stopcock on the short limb; scale with coloured gradua- 

 tion which is easily visible; on iron stand 1.1 m long 



52.819. - - idem, with fixed glass tube, with stopcock on the short limb 



r>L'..s20. --idem, on polished board, with figured graduation, Figure, without glass 



stopcock (Gan.-Man., Fig. 151, 152) 



.">_'. S21. - - idem, after Hugh M. Browne, Figure, for pressures to 10 atm., with spring 

 manometer and easily visible scale 



The apparatus is easy to manipulate, is very substantially built and possesses steel stopcocks. 

 The pressure is generated by leading in compressed air. 



s. d. 



2. 0.0 



1. 4.0 

 1. 0.0 



1.10.0 

 4. 0..0 





See also the Apparatus after Schafiers, Schneider and Lermantoff, on pp. 365 

 and 366, also Barometer Tubles Nos. 52.75852,762, p. 371. 



Cl. 894. 3346, 4776, 

 892, 893. 



