Portion of a question in the last (1933) Intermediate Certificate Examination in Physics (N.S.W.) called for the definition of "a level surface", and apparently some Science teachers in schools have been perturbed because their mathematical colleagues regard a level surface as necessarily being a plane. Authorities, such as Routh in his "Analytical Statics" (Vol. II, page 23, 2nd Edition), specifically give a definition of the form: ((Level Surfaces. The locus of points at which the potential has any one given value is called a level surface. It is also called an equipotential surface. "At any point of a level surface the resultant acts along the n.orrnal to the surface." " ... Level surfaces are therefore also called surfaces of equilibrium."
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