Jones, Apparatus used by Dalton. 



Plate I. 



1. Mountain barometer with thermometer attached, made for 



Dalton by the late Mr. Lawrence Buchan, a member of 

 the Society. The barometer is enclosed in a wooden case 

 (with screw cap at the top) for convenience in carrying. 



2. Manometer tube fixed on a wooden board, divided and 



numbered by Dalton. 



3. Barometer made by Dalton consisting of a glass tube bent at 



the lower end, which is blown out to a bulb to serve as a 

 mercury reservoir. The barometer is attached by wires to 

 a narrow strip of wood with a cross piece at the lower end 

 to support the bulb. At the upper end a paper scale is 

 pasted on, with figures in Dalton's writing. The height of 

 the mercury in this barometer was recently compared with 

 a modern instrument and agreed very closely. 



4 and 5. Similar instruments, but containing a little liquid above 

 the mercury, probably indicating that they were used for 

 tension experiments. 



Plate II. 



I and 2. Glass funnels with long stems closed at the ends, 

 graduated by Dalton and used for measuring gases. 



3. Graduated bell jar with bent tube attached, for collecting and 



measuring gases. 



4. Graduated bell jar with brass cap and stopcock, for measuring 



gases. 



5. Conical glass vessel containing mercury. 



6. Small phial with graduated tube (broken) fitted to the neck, 



for measuring gases. 



