Fig. 13.
Strumbo, 1878.
In the same year, Strumbo had also constructed a secondary generator like that of Gaulard, and a description of it was contained in the newspaper ‘Le Monde,’ of 24th October, 1878. It is of note in this apparatus, which we have illustrated in Fig. 13, that the primary and secondary wires were wound side by side, and that both coils had the same relative position to the iron core.
Harrison, 1878.
Harrison also, in the same year, took out a patent having the same object as his of the year 1857. Both patents proposed the connection of induction coils in series. This is especially clearly mentioned in the latter of these, as there he says that both induction coils are put in circuit at intervals along the main lead, or primary circuit, so that one or more coils are near the places where lamps are to be fed.
Meritens, 1878.
We find in Meritens’ English patent, No. 5257, of the year 1878, the series connection of primary coils in the dynamo-circuit also described.