W. H. Dorman and Co., Ltd., well-known as makers of engines of all sizes, have been developing their 4 R.O. Type power unit, which is made in two sizes, 69 mm. and 120 mm. and 75 mm. and ‘2°mm—four-cylinders in each case. An absolutely standard model of the smaller type recently drove a chassis weighing 18 cwts. at a speed of 72 m.p.h., so that it is obvious that, ” hotted up,” it should be capable of a very fine performance indeed.