By 1910, the fixed jet carburetor was the most common type, giving a metered but averaged-out quantity of fuel to the engine. The mixture was rarely correct for conditions. Then Clermont Brown of Brown and Barlow came up with the solution, a variable fuel metering jet. This carburetor had most of the features of a motorcycle carb we would recognize today. A tapered needle was attached to a slide that acted as the throttle in the main air tube, and slid through a tube as the slide was raised, metering out a precise amount of fuel to the air flow. There was an extra pilot jet for slow speed running while the throttle was closed or nearly so. B&B even included a tickler to depress the float to flood the engine for starting, a primitive solution that hung around into the seventies.