HSN material related to watches and chronometers
David Boettcher's article - Middle Temperature Error - (MTE.pdf)
David's spreadsheet for Middle Temperature Error - (MTE.xlsx)
The spreadsheet can also be used to investigate the effects of the individual components. For example, to see the effect of thermal expansion of the balance alone, then set all the coefficients apart from the "Thermal expansion/degC - balance:" to zero. As a check, a brass balance should show a loss of 1.64 seconds per day for a temperature increase of one degree C, a steel balance 0.95 seconds per day per degree C. If you have any comments or questions about the article or the spreadsheet, please feel free to contact David at David.B.Boettcher (you know what goes here) gmail.com