Julius Robert Mayer-Commemorative exhibition.
On the occasion of the 150th anniversary of Robert Julius Mayer's birthday in the Munich "German Museum" from December 4th, till March 1965 a commemorative exhibition takes place. Documents, pictures and printed products, gathered by libraries private collection, are giving a view over the life and work of the famous naturalist who discovered one of the most important physical law, the production of energy and the mechanical thermal equivalent.
OPS: A dynamometer, discovered by Julius Robert Mayer in the years 1868/69. With this instrument the discoverer demonstreated, that it is possible to produce energy heat and heating.
Photo measures 8.25 x 6 inches.
Photo is dated 12-12-1964.
Photo back:
