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

CONSTRUCTION OF THE GEARBOX V that the engine itself is working and the clutch, not withdrawn. Now, in the first illustration we see these two constant-mesh pinions in their position for revolv- ing together, but as none of the three gear wheels on the layshaf t (1) are in engagement with the wheels on the main shaft (m) no motion is conveyed to the back axle. At this point, for the benefit of the novice, it may be pointed out that the primary shaft is divided and that ths three gear wheels (c, d and e), are in no way con- nected with the gear wheel (a), the end of the shaft on which the said three gear wheels (c, d and e) aro mounted having a bearing inside the gear wheel (a), the bearing in question (s) being commonly known as the spigot bearing. Now, by means of the change-speed lever, we are able to move through the medium of the striking l&ver (f) the two gear wheels (c and d), whilst by means of the other striking rod (g) we can move tha wheel (e) forwards or backwards from its position in the first illustration. Diagram showing gears in neutral position. Now, just for the sake of argument, we will assume that the wheel (a) has 20 teeth and the wheel (b) 40 teeth, so that when (a) is revolving at 1000 r.p.m. the wheel (b) and with it the layshaft and the other three wheels (h, i and j) (these are fixed solidly on the shaft with b) are .revolving at 500 r.p.m. Now, it is obvious that the slower the universal pint attachment (k) revolves in relation to the speed of the engine the 85