| _Attached Therm_. 54 deg..3. |_Data for the correction of | | | 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.