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Motor-Propelled Vehicles 315 The field of experiment moved from Britain to France, and the French experimenters worked dili- gently and incessantly towards the realisation of the idea. A decided impetus was imparted by Gottleib Daimler’s internal combustion motor with enclosed crank and flywheel, which was a distinct improve- ment upon that devised by Lenoir. But prior to the appearance of this engine an English inventor, Edward Butler, undeterred by restrictive legislation, suc- ceeded in evolving a practical and efficient petrol cycle. What is more to the point, this machine incorporated all the fundamental features considered as essential to-day, such as the float-feed spray car- burettor, the magneto dynamo, and also the high- tension ignition system with accumulator and coil, which system, by the way, is undergoing a spirited revival in certain American motor-manufacturing circles at the present moment. This machine was designed to use the most volatile oil products as fuel, and, indeed, paved the way to the general adoption of petrol for this purpose. In the construction of this car Butler experienced his full share of the difficulties which assail an inventor when attempting to produce something entirely new. His two cylinders, only 2} inches in diameter, had to be fashioned from phosphor-bronze because cast- iron cylinders of such small dimensions could not be obtained for love or money. A Clerkenwell clock- maker had to be induced to make the gear wheels used in the epicyclic driving gear which he incor- porated, while London had to be ransacked for rims for the wheels. Butler was persuaded to build his machine by the