A special Bentley-Smith carburetter for the standard cars, differing in many respects from the ordinary Smith, is used. In this the control to make starting easier in cold weather and also admit extra air does not block up two of the choke tubes as is usual, but raises a sleeve, entirely cutting off the air from the slow-running jet. To start, therefore, it is important to close the hand throttle completely and then cut off the air for the slow-running jet. When the engine has started the control must, of course, be returned to normal position; the extra air, on the other hand, should not be kept open the whole time if the car is on full throttle and maximum power is required.   Continued...