Details
An electro-magnetic anemometer
by Jules Richard, Paris No. 96102, the drum and recording mechanisms with clockwork motors, the recording stylus with electro-magnetically controlled pressure, in glazed mahogany case -- 12½in.(32cm.)wide
by Jules Richard, Paris No. 96102, the drum and recording mechanisms with clockwork motors, the recording stylus with electro-magnetically controlled pressure, in glazed mahogany case -- 12½in.(32cm.)wide