Translated extract of a letter, from M [Charles Francois de Cisternay] du Fay to Cromwell Mortimer, dated at Paris Original letter was in French and dated 29 January 1736 States that he sends a brass rule of three Parisian feet with M Pigault, a merchant, and wishes it to be given to Mr Graham. Asks when the pendulum and other instruments, which Graham is making, will be ready 1736