Thet saying for a long time .
In late 1950¡¯s they changed inch and feet to 1" = 25.4 mm.
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Ball bearing in 1920s and 1930s was designed around the metric system.? But using inch bar stock. So you machine a little and the bearing fit .?
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The biggest problem is the one inch vs 25 mm.? If they have a metric around a inch? . Like 25mm = one metric inch a better name like IMG so let would say I need 5 img or 125mm? basically witch say? would 5or 125 on job site. That like saying I need? 80/16 on job site.?
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I do not why they Celsius just use?Fahrenheit. The guy how invented Fahrenheit design around using it. In Celsius we have ?¡ã to be about same as 1¡ã Fahrenheit.
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Myself because ball bearings I had to deal with metric most my life. Use both you can quickly see why the slow change?
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Dave?
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davesmith1800