You're viewing this item in the new Europeana website. View this item in the original Europeana.

Resonator

RK (Rudolph Koenig monogram stamped on the rim of the larger orifice). 7 (Koenig series number stamped on the rim of the larger orifice). DES after HELMHOLTZ,Hermann,Ludwig,Ferdinand,Professor,von. circa 1856 Bonn, Germany. MANU Rudolph Koenig. circa 1866 30 rue Hautfille, Paris, France. This is a spherical Helmholtz's resonator made from two soldered and burnished hemispheres of spun brass. It is…