Robbins' Batman emphasizes the sleuthing aspects of the character, and the Shadow-like creeping about with the cape.
Notice how Robbins tries to give emotional feeling to his lettering; he emphasizes certain words by having them completely go off the perfect horizontal line that the rest of the words are bound on.
Frank Robbins 1974 From Weird War Tales #21 January 1974
Detective Comics #426, Aug 1972, Frank Robbins Page
Detective Comics #426, Aug 1972, Frank Robbins Cover
House of Mystery #226, Aug-Sep 1974, Robbins Art
Frank Robbins House of Mystery #233 - Page A
Frank Robbins House of Mystery #233 - Page B
The Shadow #7, Oct-Nov 1974, Frank Robbins art
The Shadow #8, Dec 1974-Jan 1975, Frank Robbins art