16,964. Smith, L., and Page, E. July 20. Spray carburettors.-Fuel is caused to pass through a heater c, which is directly heated by the gases in the combustion chamber, before passing to the carburettor. The heater is preferably screwed into the plug-hole above the exhaust-valve, and, if necessary, two or more may be connected in series. For starting, an electric heater h may be employed, the supply of oil from the heaters being directed to the carburettor by the cock j. Starting may otherwise be facilitated by igniting spirit contained in a trough around the chamber c.