1876.] 
at South Kensington. 
375 
inch in diameter (referred to in his latest memoir on the 
“ Analysis of Sugar ”) which he employed occasionally in 
his lectures, as illustrating his newly-discovered laws of 
combination and the atomic theory ; these appear, unfortu- 
nately, to be no longer in existence. 
No. 41 is a common pair of scales used by Dalton. 
No. 42, a pair of apothecary’s scales and weights em- 
ployed by Dalton, with a paper of weights made of wire, 
labelled in his handwriting “ 100th grains.” 
No. 43 is a box of weights used by Dalton, and containing 
a pill-box labelled “ Platina,” another pill-box labelled 
“ Hund,” and containing 100th of grains, and another 
wooden box containing brass gramme weights, labelled 
“ Weights, French the other ordinary weights are of lead. 
No. 44 is Dalton’s pocket-balance, consisting of a small 
pair of apothecaries’ scales, with beam about 4 inches long, 
and having the pans attached by common string ; it is con- 
tained in a tin case for the pocket. 
No. 45 is a penholder used by Dalton. 
No. 46, leaden grain weights made by Dalton from sheet 
lead, and stamped in numbers by him. 
No. 47, iron punches used by Dalton for this purpose. 
No. 48, a glass lens, wrapped in a piece of paper, labelled 
in Dalton’s writing “ Sun’s focus 4*2 inches.” 
No. 49 is a paper containing “ 10th of grains,” made by 
Dr. Dalton of iron wire. The paper in which these are 
wrapped is part of a note from one of Dr. Dalton’s pupils 
(as is well known he lived by teaching mathematics at half- 
a-crown per lesson), in which the writer presents his “ com- 
pliments to Mr. Dalton, and is sorry that he will not be able 
to wait upon him to-day, as he is going to Liverpool with a 
few friends who are trying the railway for the first time. 
Mr. D. may fully expeft him on Monday at the usual time.” 
No. 50 are bottles of tin, earthenware, and silver, some 
of them being common penny pot ink-bottles. Each has a 
thermometer tube cemented into the neck of the bottle, and 
these tubes are provided with paper scales. These were 
used by Dalton probably for experiments on radiant heat. 
No. 51 is a manometer tube used by Dalton : it consists 
of a tin vessel attached on either side to leaden tubing, and 
having a thermometer tube closed at the upper end, and 
provided with a divided scale, fixed into the upper portion 
of the tin vessel. 
No. 52, Dalton’s Balance, made by Accum, and capable 
of arrangement as hydrostatic balance with weights and 
counterpoises. 
