Manchester Memoirs, Vol. xlviii. (1904), No. 33. 3 



Plate III. 



1. Small glass lens, wrapped in a piece of paper on which is 



marked in Dalton's writing " Sun's focus 4*2 inches." 



2. Glass specific gravity bottle. 



3. A common pair of scales used by Dalton. 



4. A specific gravity bottle, 1,000 grains capacity. 



5. Lead counterpoise for specific gravity bottle, stamped " 175," 



wrapped in paper marked " bottle balance." 



6. Set of brass grain weights from 1,000 to 20, in wooden box 



(two missing). 



7. Glass specific gravity bulbs with figures engraved on each. 



These are contained in a wooden case on the Hd of which 

 is a table of values, "0= I'ooo, i = i"ooi, 2 = i"oo2," &c. 



8. Set of brass grain weights from 1,000 to 20 grains, in wooden 



box. 



Plate IV. 



1, 3, 4, 5, 6, 7, 8. Seven water thermometers of different materials 



(stoneware, brass, iron, tin, lead, &c.) for determining the 

 temperature of the maximum density of water. Nicholson^ s 

 Journal, 1804, page 94. 



2. Stoppered phial with the bottom cut off and with tube fitting 



the neck, for collecting and measuring gases. 



Plate V. 



1. Dalton's pocket balance with beam four inches long and 



having the pans attached with common string, contained 

 in tin case. 



2. Set of four French weights from 10 grammes to i. 



3. Boxes of weights, grammes and grains, the larger ones of 



brass the smaller of platinum. 



4. Leaden grain weights made from sheet lead and stamped with 



numbers by Dalton. 



