| | the Instrument_. |
+---------------------------------------+-------------------------------+
|Barometer reading. 29.409 |Neutral point 30.123 |
|Corr. for capacity - .017 |Capacity 1/42 |
| |Capillary action + .032 |
+---------------------------------------| |
| 29.392 |Zero to Royal Society + .036 |
|Corr. for capillarity + .032 |Corr. for altitude above |
| | water-line + .004 |
+---------------------------------------| |
| 29.424 | |
|Corr. for temperature - .068 | |
+---------------------------------------| |
| 29.356 | |
|Corr. for zero and water-line + .040 | |
+---------------------------------------| |
|Aggregate = pressure at | |
| sea-level 29.396 | |
+---------------------------------------+-------------------------------+

It would greatly facilitate the comparison of the barometric
observations by projecting them in curves when all the proper
corrections have been applied. This may be accomplished by a much
smaller expenditure of time than may at first be supposed. A paper of
engraved squares on which the observations of twelve days may be laid
down on double the natural scale, would be very suitable for the
purpose.[4] The projection of each day's observations would occupy but a
short time; and should circumstances on any occasion prevent the
execution of it, when the ship was becalmed or leisure otherwise
afforded, it would form an interesting and useful occupation, and serve
to beguile some of the tedium often experienced at such intervals.

_Registers._--For the particular object in view the register need not be
very extensive. One kept in the annexed form will be amply sufficient.
It should, however, be borne in mind that none but _uncorrected_
observations should find admission; in point of fact it should be
stri