No. -.2657. 



Water Drawing Wheels, Sluica raising Apparatus. Piezometers and Accessories. 



359 



52 647. 1 : 5. 



52649. 1:8. 



52 650. 1 : 8. 



52 657. 1 : 8. 



52 654. 1 : 5. 



52 656. 1 : 5. 



2,650. Piezometer, after Oersted, Figure, with pressure pump and spring pressure gauge, s - d. 

 tested to 10 atm.; easy and convenient to manipulate and fill; with discharge cock, 

 1 pressure vessel, graduated, and mercury vessel (Fr. phys. Techn. I, 2, Fig. 2524) . i 8. 0. 



2.651. - - idem, with Safety Valve 



2.652. Attachment with Pressure Vessel, Thermometer and Air Manometer for Piezometers Nos. 52,650 and 

 52,651, cf. Fig. 52,649 



2.653. Attachment with two Gas Pressure Tubes, after Despretz, for comparing the differing compressibility 

 of gases (Chwolson, Lehrb. I, Pig. 227) 



2.654. Attachment with 1 Ether Vessel and 1 Water Vessel, for the Oersted Piezometer, Figure, for 

 comparative experiments 



i,655. Attachment, consisting of Lead Plate and Ether Thermometer in protecting tube, and Manometer, 

 for demonstrating the lowering of the melting point of water by pressure, after Thomson (M. P., HI, 

 Fig. 327 [II, 2, Fig. 95]), for the Oersted Piezometer '. 



:,656. Attachment with Four Tubes, after Magnus, Figure, for liquifying gases by pressure (M. P., HI. 



Fig. 306 [II, 2, Fig. 163]) 



Four short barometer tubes are contained in one common vessel and can be fed with mercury 

 and with different gases which are present above them. 



2,657. Piezometer, after Eegnault, Figure (M. P., HI, Fig. 152 [I, Fig. 412]), with glass 



vessel and nickelled metal parts 



8. 10. 



i. o. o 



1. 0. 



i. 10. 



2. 5. II 



1. 10. 



6. 10. 



Cl. 5768, 819, 5404, 

 822. 821, 3341. 



