My guess would be that the mounting hole sketch is direct from the manufacturer, and needs to be somewhat exact. The other dimensions are all clearance dimensions and can be rounded up to the next Imperial fraction with no risk; those were probably measured or converted for the US (or UK?) market.
--- On Fri, 7/17/09, John Frewen-Lord <j...@frewston.plus.com> wrote: From: John Frewen-Lord <j...@frewston.plus.com> Subject: [USMA:45408] mix of measurements To: "U.S. Metric Association" <usma@colostate.edu> Date: Friday, July 17, 2009, 6:20 AM Dear all: I have been browsing the net looking for parts/mechanisms to restore an antique clock I have. Many of the potential suppliers are in the US, and I have found quite a mix of imperial and metric measures. Mostly imperial, but metric here and there (likely when describing German or other non-US sourced components). The attached picture really intrigued me - don't know whether the company on whose website it appears created it, or was supplied from elsewhere. The font used for both the metric and imperial dimensions is the same, so likely the same person added the mixed measurements. Cheers John F-L
