Most visitors online was 1660 , on 12 Dec 2020
In an article published in CLOCKS July 1984, Vaudrey Mercer investigates the errors that besets the makers of early chronometers and the diverse methods they use to overcome them. In the article John Poole's chronometer balance with auxiliary compensation was discussed. His balance prevents the rim from moving outwards to its fullest extent and hence it is suitable for exposure to extreme cold. His chronometers were much in use in the vessels sent to find the North West passage. This type of balance halves the middle temperature error and greatly reduces the error in low temperature.Mun, your chronometer has Poole's auxiliary compensation for middle temperature error applied to the balance. Some of the better makers implemented it into their chronometers. Dent, Barraud and others among them.
Ralph