IMPERIAL STANDARD TROY POUND WEIGHT. 
459 
I gave him. He had the goodness to comply with my wish. I received an answer, 
(out of which I extract the passage relating to the comparisons in 1827 and 1829,) 
with the following notice, which I subjoin entire. 
“ York Gate, Regent’s Park, 31st May, 1829. 
“ . . . . I have the pleasure at length to send you the comparisons of your Troy pound with two 
“ of mine. I am totally at a loss to conceive how this pound can have undergone the alteration you 
“ mention ; for as to an error of even the hundredth of a grain in the mean of two or three compari- 
e< sons, it appears to me to be impossible. When I formerly tried it, it was merely with a view to see 
“ that Mr. Bate had not made any great error, and I therefore made only two or three comparisons. 
“ It is useless, however, to speculate further upon this. 
“ The comparisons I now send you have been made with all the care I could bestow on them ; 
“ and I think, taking the mean value of this pound and the one by Robinson I before examined, you 
cf will be very near the truth. 
ce Henry Kater. 
“ Comparisons of Professor Schumacher’s Troy Pound, made by Bate, with Captain Kater’s 
two Troy Pounds. 
Date. 
Capt. K.’s 
Old Pound. 
Prof. S.’s 
Pound. 
Capt. K.’s 
Unmarked Pound. 
1829. 
Div. 
Div. 
Div. 
Feb. 18. 
0'6 
1-5 
1-9 
19. 
0'6 
1-6 
1-5 
0'6 
1-9 
1*6 
0-5 
1-6 
1-6 
20. 
0-4 
IT 
1-3 
0'2 
IT 
1-3 
0'9 
2'9 
2-7 
21. 
0'8 
2'8 
2-6 
1-1 
3-4 
3-7 
22. 
1-0 
2-7 
3-0 
11 
3-3 
30 
IT 
2-5 
27 
23. 
1-2 
2-9 
2-4 
0'5 
2-9 
2-7 
24. 
IT 
3-3 
2-8 
26. 
1-7 
3-5 
3-3 
27. 
1-7 
3-8 
3-2 
Mar. 9. 
0-6 
1-8 
1-2 
0-4 
1-9 
1-2 
10. 
0'3 
2-2 
2T 
Mean . . 
0-79 
2-44 
2-44 
2-29 
2-44 
+ 1*65 
+ 0T5 
One hundredth of a grain was found to be = 1'38 div. 
Hence 1 div. — 0 00725 gr. (See below.) 
Zero changed. 
Professor Schumacher’s pound heavier! _ 
than the old pound 1 ■ 65 div J ~ 
Old pound heavier than the imperial pound 
•0119 gr. 
•0122 
Professor Schumacher’s pound heavier 
than the imperial pound 
Professor Schumacher’s pound heavier 
than the unmarked pound 0‘ 15 div. 
Unmarked pound heavier than the impe- 
rial pound 
•0241 
•0011 
•0267 
Prof. S.’s 
By unmarked pound . . 
By old pound 
+ '0278 
+ -0241 
Mean + ‘0259 
3 n 2 
