Use of Sl units is not mandatory, however, if other units are more appropriate. The number of the equation, in parentheses, should be placed near the right-hand margin. Avoid bars either above or below letters. Avoid subscripts on subscripts, etc. Adequate space must be allowed for marking of inferior and superior letters or numbers.
Crowded equations lead to errors in composition.
Final responsibility for correcting errors lies with the author. Manuscripts should be sent to the Editor, American Journal of Physics, Merrill Science Building, Room 222, Box 2262, Amherst College, Amherst, Massachusetts 01002. Receipt of new manuscripts will be acknowledged to the principal author. We try to provide a further report to authors within 3 months of the date of receipt, but a longer delay is sometimes unavoidable. Correspondence concerning papers with more than one author should include the names of all authors, and the AJP editorial office manuscript number.