268 G. F. Becker—Correction for Vacuum in Chemical Analysis. 
a condition which will be fulfilled if none of the three is over 
one-thirtieth milligram. 
e following tables answer these conditions, for all specific 
gravities above 1, in the fewest possible numbers. 
Vacuum Correction. 
(Weights of brass) for Correction per gram. | (Weights of platinum) for 
specific gravity between Error <345 Mg. specific gravity between 
27°738 and 11-064 —0-000 067 gram. 
11°064 6°904 0-000 000 51:766 and 13°568 
6-904 5019 +0°000 067 13°568 7-807 
5°019 3°943 0-000 133 7-807 5'480 
3°943 3°247 0-000 200 5-480 4°222 
3-247 2-759 0-000 267 4°222 3°433 
2-759 2°399 0°000 333 3°433 2°893 
2°399 2°122 0-000 400 2°893 2°500 
2°122 1'903 0-000 467 2°500 2°201 
1903 1724 0-000 533 2°201 1°965 
1724 1576 0-000 600 1°965 L776 
1576 1°452 0-000 667 TT6 1619 
1°452 Poet 0°000 733 “619 1°488 
1377 1-254 0-000 800 488 L3Ti 
1°254 1174 0000 867 3TT 1:28] 
1174 17103 0°000 933 1°281 1:197 
1°103 1041 0-001 000 L197 17124 
1041 0-985 0°001 067 1°124 1-059 
0-001 133 059 1°002 
0°001 200 1-002 0°950 
The fraction which may be neglected without an error of 
more than one-thirtieth milligram will of course vary with the 
specific gravity and will in any case 
Fr] 
00000333" 
e e 
a5 215 = 0°0000872 gram, 
