There was a 12:1 ratio between the foot ' inch '' line ''' and point '''' in pre-decimal engineering. Yes, they used triple prime marks. The typographic point w

There was a 12:1 ratio between the foot ' inch '' line ''' and point '''' in pre-decimal engineering. Yes, they used triple prime marks. The typographic point was originally 1/144th of an inch. Watches are typically measued in french pointes.