Experimental Design B

National FAQ: What is a linear measuring device (the rules are vague)? (section: 3 / paragraph: l / sub-paragraph:  / line: 1)

A: A linear measuring device is any item marked are regular, standard intervals suitable for measuring length. It must have markings in only one dimension (ruler, meter stick, tape measure, caliper, etc). A carpenter's square would not qualify as it has markings along two dimensions.