The mirror galvanometer proved to be yet another point of contention. Whitehouse wanted to work the cable with a very different scheme. He wanted to drive the line with a massive high-voltage induction coil, producing several thousand volts, so that enough current was available to drive standard electromechanical printing telegraphs used on inland telegraphs. Thomson's instrument had to be read by hand. It was not capable of printing, but much later he invented the syphon recorder for the second transatlantic attempt in 1866. The decision to start mid-Atlantic combined with Whitehouse dropping out of another voyage left Thomson, on board "Agememnon" sailing towards Ireland, with a free hand to use his equipment without Whitehouse's interference. Although Thomson had the status of a mere advisor to engineer C. W. de Sauty, it was not long before all electrical decisions were deferred to him. Whitehouse in Valentia remained out of contact until the ship reached Ireland and landed the cable.