Rate: 2.5Hz, 5 beats per second, 18000 bph (beats per hour) Jewels (gemstone bearings): 21, friction set, all upper jewel settings are gold Movement size: 16, 1.700 inches, 43.18 mm diameterĪpproximate watch size (depends on case): 2 inch (5cm) diameter, weight 90g It has a beautifully decorated movement.Ī 1948 Hamilton Railway Special, grade 992B, 21J The Hamilton 992B pocket watch is a beautiful watch not only on the outside. In this article we focus however on watches and it is this focus on timing only that lead to those beautiful and precise American railroad watches. Ball January 16, 1910).Īn interesting question from a historic point of view is of course: why did nobody in North America come up with any solution other than time keeping? Many other countries solved the root cause of the problem with station to station communication, signaling, tokens or dual track. He gave a very interessting interview in the New-York Tribune Janu( Many lives sacrificed because of faulty watches, interview with Webb C. Ball's career eventually led to him being the time inspector on more than half the United States' railways, leading to a far more uniform set of standards across the US. His first job as a time inspector was when he was brought in by the Lake Shore and Michigan Southern Railways in 1891 after a crash and was tasked with bringing their time inspection system up to industry standards. These railways had a single track for both directions and two trains running in opposite direction could pass each other at railway stations and other places which had two tracks, one for each direction, for a short distance only.Ī notable watch inspector was Webb C. Regular watch inspection and consistent time keeping was the only thing that kept trains from running into each other on Americas single track railways. The need for Railroad Watches to be "railroad approved" stemmed from a number of train accidents in the late 1800's where two trains collided head on due to poor time keeping. A lot of other mechanical watches are off that much in just one day.
Then you will achieve about +/- 15sec accuracy
Is exposed to different temperatures and shaken or turned A well maintained and adjusted watch kept inĪ fixed location at room temperature can reach accuracies The Hamilton grade 992B is a high quality antique mechanical pocket watch. The Hamilton 992B Railroad Pocket Watch, Hamilton Railway Special Hamilton 992B Railroad Pocket Watch, Hamilton Railway Special
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