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  • Isochonism vs Isochronal Rates - NAWCC Forums
    In being forced to think this through, I have concluded watchmaking (or me at least) has used the terms isochronism and isochronal rates interchangeably when in fact they are not Isochronism refers solely to the uncoupled spring Once that spring is coupled to a balance (pendulum), all bets
  • A Few Thoughts on Isochronism and a 60 Hour Mainspring
    Watches are tested for isochronism in the vertical, pendant-up position as that is the position in which they are generally carried, and therefore the position in which isochronism is of most importance, although a nearer approach to true isochronism can usually be obtained with the watch in the horizontal position
  • Position adjustment--- what is it and how do you do it? - NAWCC Forums
    A watch adjusted to isochronism oscillates the balance wheel at the same rate throughout the specified length of run between windings of the mainspring, regardless of how far in each direction the balance wheel rotates This length of run is typically 30 hours for earlier watches and 42 hours for post World War I watches of better quality
  • Regulating for Isochronism - NAWCC Forums
    The breguet overcoil was a very important creation for improving isochronism, but good isochronism can also be achieved with a flat hairspring if the terminal curves are correct The shape is critical for both For example, if the overcoil approaches the staff too closely, the watch will be go faster as the mainspring runs down (short arc)
  • Isochronism for the working watchmaker (theory to practice)
    Also, isochronism is an absolute only in the ideal state A timepiece is said to be isochronal when all the preconditions are met (lube, gearing, escapement setup etc) when it's instantaneous rates fall within some limit (defined by manufacture I guess) These instantaneous rates are measured when nearly fully wound and for watches, 24 hours later
  • Illinois 16s Grade 187 - Movement Marking Damascening Variations
    1 Grade 187 was Illinois' preeminent 16s, 17j, railroad grade movement from 1897 to 1912 It was produced in two date ranges, first from 1897 – 1903 and secondly from 1908 – 1912 It was produced both as a Model 4, hunting and Model 5, open face variant From 1897 – 1903 most had single roller escapements and were adjusted to temperature, isochronism, and 6 positions From 1908 – 1912
  • Illinois Watch Company - NAWCC Forums
    I have just recently acquired one of the top three watches on my bucket list It is an Illinois Watch Company 18 Size, 17 Jewel, Bunn grade, from 1905 with the “Temperature, 6 Positions, Isochronism” marking in the shape of a flag In this post a little background regarding this scarce
  • Isochronism, pins spacing and positional adjustment
    That isochronism is primarily independent of all the other adjustments and must be checked Secondly, the oft written statement about keeping the regulator pins close is to be viewed with skepticism
  • Isochronism And Railroad Pocket Watches - NAWCC Forums
    Isochronism was assumed from the spring geometry but to test this they would have had to do many more time checks per day With timing machines it's a lot easier but COSC tests well over a million watches per year and they do not have resources to do anything but average daily rate





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