How To Drive A Motorcar
A Key To The Subtleties Of Motoring

____ _______ _______________ TOP GEAR there are slots on the inside of the wheel (e) to corre- spond to these, so that if e is pushed forward to engage those dogs, e and a. are locked together and the primary shaft then travels the same speed as the engine. __ We have, however, to remember here that a, just before the moment of declutching, was doing 1000 r.p.m., whilst e was only doing 500. Now when w® declutch the speed of e will drop to, say, 450, and therefore, before the slots in it can be engaged with the projections on the wheel (a) the speeds of the two wheels must be approximately equal; in other words the speed of the engine must drop down to about 450 before the engagement can be made with silence and without jar. Therefore, an appreciable little pause after coming out of third is requisite before engaging ^We have now been right through the whole theory of Diagram .bowing direct drive on top gear : w**®“ *eJ“8^1 of E are moved into engagement with the smaller tee gearwheel A, the direct drive is obtained. c-l II the why and the wherefore of quiet gear changes in an up direction, and, epitomizing the theory, in P’’actlc® we get the following effects :-(l) To come through neutral into first, having declutched, wait a moment for the constant-mesh pinions to come to rest so __ the low gear wheels may be engaged. W hen one s too great a hurry to get into low gear and a little noise results, it is because the layshaft has not stopped re- volving and one tries to bring into engagement with the 91