Five of the earliest (1877-1880) telephones in the world; 2 from Bell and 3 from Siemens & Halske.	Another portable Ericsson telegraph (this one has never been used!).	The back view of this splendid telegraph.	A very rare Breguet dial telegraph. The transmitter and receiver are integrated in one box.	The inside: clockwork and electromagnet of this "ABC" telegraph.

	A replica of Samuel Morse's second telegraph of 1846 (original in the Smithsonian).	Detail of the electromagnet.	Detail of the clockwork.	Compare with his first one of 1844.	A siphon recorder by Muirhead (England).

	The same without the cover.	The siphon and the trembler.	The first Austrian telegraph: 1852.	Seven different Breguet transmitters.	This rare Breguet transmitter could serve three receivers.

	Replica of one of the earliest Marconi coherer receivers.	Detail of the coherer/decoherer.	A dial telegraph by Ducretet (Paris).	The back side.	A big German didactical poster.

	The typical telegraph galvanometer from Ericsson.	A didactical coherer receiver with bell.	View of the coherer/decoherer.	A single needle block telegraph.	A double needle block telegraph.

	The Batavia (now Jakarta)-Singapore cable from 1859.	A variable resistance for telegraph measurements.	A big Wheatstone bridge by Siemens & Halske.	A very early high voltage "dry-cell" battery by Zamboni