Mr. Bernstein wrote daily in his diary. Notations are made from January 1, 1904 to December 30, 1904. Tucked within the pages are loose ephemera pertinent to remarks in the diary which are noted in the Inventory. Entries end on page 189.

Lester Bernstein graduated from Lehigh University in 1904 with a degree in Civil Engineering. Bernstein, the Civil Engineering Society Treasurer and President, was awarded the Civil Engineering Society Prize in 1902-03. The collection consists of a Physical Laboratory Notebook from his second semester freshman year (Feb. 1901 – Jun. 1901). This notebook includes experiments on the study of thermal expansion, use of a barometer and the study of the principles of movement.