The close-up shows the three rollers on the press. The form rollers are the two small rubber rollers that directly contact the type. The oscillator (or vibrator) is the large steal roller that breaks down the ink and ensures even distribution.
Advertisement for the International Scientific Series of books, aimed to introduce a variety of scientific subjects to a non-scientific audience. Titles included The Forms of Water in Rain and Rivers, Ice and Glaciers by J. Tyndall.
