119 
Results {all corrections 
mad 
Standard B. 
Working B. 
Difference. 
1. 
775*21 
775-35 
+ 0*14 
2. 
775*39 
775*44 
+ 0*05 
3. 
775-28 
775-17 
-0*11 
4. 
775-07 
774-93 
-0*14 
5. 
775-54 
775-82 
+ 0*28 
6. 
774-63 
774-80 
+ 0*17 
7. 
774-25 
774*24 
-0*01 
8. 
774*24 
774*34 
+ 0*10 
9. 
773-54 
773-67 
+ 0*13 
10. 
773-85 
773-91 
+ 0*06 
11. 
775-12 
775-07 
-0*05 
12. 
775*06 
775-11 
+ 0*05 
13. 
775*24 
775-18 
-0*06 
14. 
774-98 
775-01 
+ 0*03 
15. 
774-69 
774-78 
+ 0*09 
16. 
774*56 
774*38 
-0*18 
17. 
774*39 
774-49 
+ 0*10 
18. 
774*52 
774-52 
0*00 
19. 
759-87 
759-86 
-0*01 
20. 
759*90 
760*03 
+ 0*13 
21. 
759-99 
759*95 
-0*04 
22. 
760-37 
760-22 
-0*15 
(Mean) 
772-077 
772*103 
+ 0*026 mm. 
In inches 
30-3972 
30*3982 
4- 0*0010 in. 
If to the 
above results, 
a small 
correction due to the 
difference in height of the cisterns of the two barometers 
(the cistern of the working barometer being about 40 mm. 
lower than that of the standard), the difference becomes 
+ 0*022 mm. or less than +0*0009 inches. 
The object of the experiments described in the present 
paper is not so much to find out the absolute difference of 
the two instruments employed, as to show the degree of 
accuracy to be attained by an ordinary amount of care in 
this mode of comparing standard barometers at different 
places. Although every precaution was taken to ensure 
accuracy as much as possible, still there were many other 
