Note 254 — Chapter XXIII
Reading edition
This barometer (one of Newman’s portable instruments) I have now at Kew: it was compared with the Royal Society’s standard before leaving England; and varied according to comparisons made with the Calcutta standard 0·.012 during its travels; on leaving Calcutta its error was 0; and on arriving in England, by the standard of the Royal Society, +·004. I have given in the Appendix some remarks on the use of these barometers, which (though they have obvious defects), are less liable to derangement, far more portable, and stand much heavier shocks than those of any other construction with which I am familiar.