This a photo copy of Directions for the 1929 Calculator Pencil by Ruxton.  There are 11 pages of detail information on the use of the machine.  The pencil was advertised to multiply and divide.  There were two models offered, The Executive in black with 14k gold filled and the standard model in white with 14k gold filled.  It was an amazing hand held calculator and pencil and directions are seldom found.  If you have a Ruxton pencil, these photo copies of directions will show you how to operate it.  Free USA shipping via USPS Priority with tracking ($ 10.00 charge for foreign shipments).