The requirements of railroads, where time inspection is maintained, demand that a watch run within 30 seconds variation a week.  It is significant that the Hamilton Watch is the favorite of most railroad men, meeting time inspection requirements, and with proper care, performing dependably year after year.

Watches of high grade – 17 jewels or better – are usually adjusted for temperature variations. That is, they are adjusted to keep time at temperatures varying as much as 70 degrees. Additional adjustments are the position adjustments, which mean that the watch has been timed, tested and adjusted to operate within certain limits when the watch is in any or all of the following positions; “Twelve Up”, as the watch is while resting in your pocket; “Nine Up”; “Three Up”; “Dial Up”; and “Dial Down.”

Another adjustment has to do with the hairspring and balance so that these parts insure an absence of variation between the time of winding and rewinding a watch.

A good wrist watch for men or women is an even more delicate piece of mechanism than the thin pocket watch. These wrist watches, of course, cannot be expected to render the same time service as that rendered by the high-grade pocket models, due to their smaller size and the more vigorous treatment they receive when worn on the wrist. Hamilton wrist watches, however, have become famous for their surprising accuracy.

The primary purpose of a watch is to keep accurate time, and the Hamilton Watch Company builds its watches with this purpose uppermost in mind

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