COMPARISON OF BAROMETERS. 
255 
APPENDIX K— Continued. 
BAROMETER No. 790—(CISTERN.) 
Date. 
Time. 
Cor. height. 
Date. 
Time. 
Cor. height. 
Burnet House, Cincin- 
1 
Rogers' Hotel , Fort 
nali. 
Smith. 
June 13 _ 
10 J a. m.__ 
29. 817 
! July 4 _ __ 
1J p. m_ 
29. 708 
13. 
12J p. m_ 
. 796 
4. 
4^ p. m_ 
. 691 
13. 
5.J p. m_ 
. 718 
8. 35 a. m_ 
. 7G9 
14. 
12 m._ 
. 731 
5. 
12.19 p. m. _ 
. 760 
5. 
10J p. m_ 
. 733 
G. 
8 j- a. m_ 
. 787 
6.__ 
2 p. m_ 
. 734 
Arkansas Hotel, Ha- 
6. 
9 p. m.._ 
. 792 
poleon. 
7. ... 
91 a. m.. 
. 812 
7_ 
12-j p. m. 
. 786 
June 24 _ 
11 a. m. 
30. 250 
7. . 
3-J- p. m__ 
,7_ 
6. 10 p. m_ 
.770 
8 _ 
91 a. m_ 
. 835 
8 _ 
31- p. m_ _ 
. 736 
Anthony House, Little 
8. 
6J p. m. 
.716 
Rock . 
9. 
9 a. m__ 
. 769 
9. 
12 nr. 
. 743 
June 27 . 
8| a. m. 
29. 928 
9. 
3 p. in__ 
. 703 
27. 
12J p.m_ 
. 910 
9.. 
5J p. m _ _ 
. 699 
27. 
6 p. m.. .. . _ 
. 847 
11.. 
a. in_ 
. 718 
27. 
9| p. m_ 
. 830 
11.. 
12 m_ 
. 710 
28. 
10| a. m_ 
. 913 
11.. 
21 p. m_ 
. 650 
29. 
7| a. m_ 
. 855 
11. 
6 p. m_ 
. 638 
29. 
lij a. m_ 
. 882 
12. 
9 a. m_ 
. 696 
12__ 
12£ p. m. 
. 690 
Note. —Some observations are rejected for obvious errors of reading. Such are detected by comparison 
of the several instruments at particular observations. 
Comparisons by J. Green, maker . —Cistern barometer, No. 790, reads exactly with standard, 
(Smithsonian) ; capillary action being corrected by final adjustment of scale, (diameter of tube, 
0.23 inch,) no correction is wanted but in reducing temperature to 32° Fahrenheit. 
Place of observation. 
Date. 
Instrument observed. 
Ther. att. 
Upper 
ver. 
Lower 
ver. 
No. 422 Broadway, N. Y., 2d floor 
of James Green’s shop. 
J)r> do_ 
1853. 
May_ 
Green’s standard. 
In. 
In. 
Syphon, No. 780. 
31. 325 
1. 020 
l~)n do_ 
Green’s standard. 
fin _ do_ 
... do. 
Syphon, No. 785. 
31. 330 
1. 052 
Jin do_ 
_do_ 
Green’s standard. 
Pn do_ 
Syphon, No. 781_ 
31. 145 
1.010 
_do»__ 
Green’s standard_ 
T)n do_ 
_do_ 
Syphon, No. 783_ 
- 
31. 282 
1. 162 
Pn do_ 
Green's standard_ 
....do.. 
Syphon, No. 784_ 
31.574 
. 
1. 449 
Steamship Oregon, in the harbor 
of Acapulco, Mexico. 
Do __ do_ 
1854. 
April 8, 10 p.m. 
Spenser and Brown, 
London. 
Syphon, No. 784. 
Green’s standard. 
Syphon, No. 784. 
87. 5 
84 
69. 5 
71 
31.456 
1. 368 
No. 422 Broadway, New York- 
T)o ' . do_ 
April 26, 1 p.m. 
_do_ 
31. 284 
1.500 
Height of 
bar. col. 
Diff. of 
reading. 
In. 
30. 275 
In. 
30. 305 
30. 275 
-f 0. 030 
30. 278 
30. 108 
.003 
30. 135 
.027 
30. 108 
30. 120 
30. 104 
. 012 
30. 125 
30. 130 
+ .021 
30. 088 
29.757 
— .042 
29.784 
+ 0. 027 
As the mean result of comparison of all the instruments at the commencement of the survey, 
the following measures were adopted : 
