1,182,757. Spray carburetters. ASSOCIATED CONSULTANTS Inc. May 13, 1968, No. 22538/68. Heading F1B. A carburetter comprises a primary small diameter fuel-air mixture passage 17 and a larger diameter secondary passage 35, the entrances to which are controlled by spring-loaded valves 28, 31, which move together for a small distance to open the inlet slots 27 of passage 17, after which valve 28 is arrested and valve 31 continues its motor to open the inlet to passage 35. The fuelair mixture formed in a Venturi 20 in passage 17 flows to a distributer 22 and through narrow bore passages 24, 25, Fig. 4, to separate nozzles 46 in the air intake manifold branches which receive air from the passage 35. The primary air enters under control of a throttle valve 12 and valve 31, guided by a cylindrical extension 33, is urged against valve 28 and a stop 54 by a spring 50. At small throttle openings valves 28, 31 lift slightly together to open slots 27; the end 30 of valve 28 then contacts the carburetter body, preventing further movement, whilst valve 31 remains free to move, as valve 12 is opened. The separation of valve 31 from valve 28 opens the inlet to the passage 35. Light springs 55 assist valve 28 away from its seat 54. In a modification the piston 31 is replaced by a diaphragm.