quote:Originally posted by dkdkrd:
One point, though...HO is not 1/8" to the foot in scale. It's close. But 3.5mm to the foot is the more precise definition of HO scale as employed by most quality manufacturers. That will be a subtle difference found in model railroad scale rules but not on an architectural rule.
Exactly, O is 6.35mm to the foot, learn to work in millimeters and you only need one ruler.