Correspondence and papers concerning improvements in chronometers, concerned chiefly with E.T. Loseby's chronometer. The volume includes correspondence on Loseby's new time-keeper in the 'Journal of the Society of Arts'; a patent for his improvements; and printed correspondence on its claims. There is also a paper by E.B. Denison 'on some recent improvements in clock escapements'; pieces on G. Philcox and J. Ontan's escapements; and letters by F. Beaufort, F. Dent and W.H. Miller.