LIGHT KNEE REST HOLDS BOOK OR MAGAZINE (Feb, 1932)
This looks pretty useful.
LIGHT KNEE REST HOLDS BOOK OR MAGAZINE
Reading is made painless for the most comfort-loving of mortals by a new book rest that clamps lightly over the reader’s knee. It not only supports the book’s weight but holds it open and keeps the place. Extension arms unfold to hold a magazine or a sheet of music. The user, sitting in an easy-chair, has both hands free to make notes, smoke, or eat.