Showing 58 results
Archival description
Letter about perpetual motion
Letter about perpetual motion
Letter from an engineer about perpetual motion machine
Letter from an engineer about perpetual motion machine
Letter from Benjamin Smart about his perpetual motion machine
Letter from Benjamin Smart about his perpetual motion machine
Letter from Border Long about perpetual motion machine (with copy), letter from I W Clarke about hemp in Canada (with copy) and two envelopes
Letter from Border Long about perpetual motion machine (with copy), letter from I W Clarke about hemp in Canada (with copy) and two envelopes
Letter from CSE Richter in French, signed 'JNCJGAG' or 'JNCH Ingenieur-Geographe, Architecte et Graveur' about perpetual motion
Letter from CSE Richter in French, signed 'JNCJGAG' or 'JNCH Ingenieur-Geographe, Architecte et Graveur' about perpetual motion
Letter from De Manger in French on perpetual motion
Letter from De Manger in French on perpetual motion
Letter from Dr J C Lettsom about perpetual motion
Letter from Dr J C Lettsom about perpetual motion
Letter from Francis Dubourdier about his method of obtaining perpetual motion
Letter from Francis Dubourdier about his method of obtaining perpetual motion
Letter from Frederick Matthews about perpetual motion machine
Letter from Frederick Matthews about perpetual motion machine
Letter from G H Bates about premium for perpetual motion
Letter from G H Bates about premium for perpetual motion
Letter from J Atkinson about his method of securing perpetual motion
Letter from J Atkinson about his method of securing perpetual motion
Letter from J N Morgan about perpetual motion machine
Letter from J N Morgan about perpetual motion machine
Letter from J N Morgan about perpetual motion machine
Letter from J N Morgan about perpetual motion machine
Letter from J N Morgan about perpetual motion machine
Letter from J N Morgan about perpetual motion machine
Letter from J N Morgan about perpetual motion machine with drawings
Letter from J N Morgan about perpetual motion machine with drawings
Letter from J W Barnard about perpetual motion
Letter from J W Barnard about perpetual motion
Letter from James Hill about his discovery of perpetual motion
Letter from James Hill about his discovery of perpetual motion
Letter from James McCan about a plan for a perpetual motion
Letter from James McCan about a plan for a perpetual motion
Letter from James Randoll about his perpetual motion machine
Letter from James Randoll about his perpetual motion machine
Letter from Johann Ludwig in German about his discovery of perpetual motion
Letter from Johann Ludwig in German about his discovery of perpetual motion