Experimental Unit: Detector and Morse Receiver«, c. 1910
France. Containing: detector with
"S.F.R." crystal; coherer with decoherer; relais Baudot by J. Carpentier;
miliampere relais by Chauvin & Arnoux/Paris; lightning projection further
coils and switches. Mahogany case and base. – Very good restored
condition. A very early wireless communication experimental set.