188 PROFESSOR H. B. DIXON AND MR. E. C. EDGAR 



In this experiment the palladium bulb has a volume below that of the counterpoise 

 by rather less than '5 cub. centim. The mean barometric pressure at the first 

 weighing was 7G6'1 millims., and the mean temperature was 14'5 C. At the second 

 weighing, after the combustion, the mean barometric pressure was 761'2 millims., and 

 the tempei'ature was 12 0- 1 C. The difference in weight of - 5 cub. centim. of air 

 measured under these conditions is only - 001 milligramme, and is therefore negligible. 



Subjoined are the details of the weighings of the palladium bulb in Experiment V 



EXPERIMENT V. Before Combustion. 



Temperature of balance (at start of weighing) 14 -5 C. 



(at end )14-GC. 



Barometric height (at start of weighing) 766' 7 millims. 



(at end 765-5 



Weights used were: 20, - 5, '02, -01 and -01. Rider on 2nd division on beam. 

 Zero at no loud .... 498. 



,, (weights in right pan) 393. Mean zero at no load 497. 



,, ( ,, ,, left ,, ) 009. Zero (weights in right pan, mean of 5) 398 -2. 



( right ) 390. 



( ,, left ) 591. ( left 4) 597. 



at no load .... 49G. 



(weights in right pan) 404. Sensibility 202. 



( left ) 599. 



( right ) 408. 



( left ) 589. 



( right ) 396. 



at no load .... 498. 



Weight of bulb (before experiment) 420-54222 grammes. 



EXPERIMENT V. After Combustion. 



Temperature of balance (at start of weighing) 11 -8 C. 



(at end )12-4C. 



Barometric height (at start of weighing) 760-5 millims. 



(at end )761'9 



Weights used were: 10 (A), 5, 2, 1 (I), 1 (Z), -5, -02, -01 (1), and rider on 5th division. 

 Zero at no load .... 503. 



(weights in right pan) 480. Mean zero at no load 501. 

 .. ( left ) 514. 



( r ig nt ) 488. Zero (weights in right pan, mean of 5) 489 4. 

 ,, at no load .... 501. 



(weights in left pan) 513. ( left 4)512-8. 



,1 ( right ) 496. 



( .. left ) 509. Sensibility 201. 



( ., ,i right ) 492. 



( ,, ,, left ) 515. 



( right ) 491. 



,, at no load .... 499. 



Weight of bulb after experiment 419-53605 grammes. 



