Exp. 3. Â Measure the length, breadth, and thick ness of a piece of wood of right-angled cross section, and find its volume (space occupied) with reference to some standard unit, as the centimeter or inch. Exp. 4. Â Measure with a pair of calipers the diam eter of a cylindrical solid (as piece of round molding), and find its volume. [appendix, Section II.