Because of the international character of the Journal, no rigid rules concerning notation or abbreviation need be observed by the authors but each paper should be self consistent as to symbols and units which should all be properly defined. Greek letters and unusual symbols should be identified in the margin. Distinction should be made between capital and lower case letters, between the letter O and zero, between the letter l and the number one and prime, between k and kappa. A vector will be printed bold face and to indicate this the letters should be underscored with a single wavy line. The numbers identifying mathematical expression should be placed in parentheses.
Illustrations are to be restricted to the minimum necessary.
They should accompany the script and should be included in manuscript pages. Line drawings should include all relevant details and should be drawn in black ink on plain white drawing paper. Good photoprints are acceptable but blueprints or dye line prints cannot be used. Photographs should be sent as glossy prints. If words or numbers are to appear on a photograph, two prints should be sent, the lettering being clearly indicated on one print only.