Einstein's Zurich Notebook
The document known as the Zurich Notebook is a blue bound notebook, 17.5 x 21.5 cm, containing 45 sheets of squared white paper (not counting two sheets that were torn out, probably by Einstein). Three sheets were left blank. The document thus consists of 84 pages. Two typed notes are taped to the front cover (reproduced on p. 316), probably by Einstein’s secretary, Helen Dukas. One says: “Notes for lecture on Relativity probably Zurich.” The other describes the back cover (reproduced on p. 317): “s. back of this notebook “Relativitaet” in aE’s hand.” The first and the last page are glued to the insides of the covers.