Diamond. (Stand 98.)
2½ h.p.; 70x76 mm. (293 c.c); single-cylinder four-stroke; side-by-side valves; drip feed lubrication; Amac carburetter; C.A.V. chain-driven magneto; two-speed Enfield gear; chain and belt drive; Dunlop 26x2½ in. tyres. Price £84.
D.F. AND M. Engineering Co., Ltd., Diamond Works, Wolverhampton.
Amongst the firms who distinguished themselves just prior to the Show by setting up new records at Brooklands are the D.F. and M. Engineering Co., whose beautifully finished little J.A.P.-engined lightweight forms a centre of attraction. Model K embodies a J.A.P. engine and Enfield two-speed gear, yet; though the specification appears ordinary, there are many little details which distinguish the Diamond range from the average machine. A simple frame construction with straight sloping top tube gives a pleasing appearance, and duplex front down tubes are a well-known Diamond feature. These tubes are detachable, as also is the lower tank rail on which the tank is supported. A most ingenious feature is the method of fixing the Enfield countershaft gear. The gear is carried in an aluminium casting, which bolts up to a bracket suitable also for a standard countershaft gear. Both primary chains and the selective clutches are entirely enclosed in an aluminium case, the top half of which is easily detachable, though great care has been taken to render the joint oil-tight. A simple heel brake and excellent mudguards complete the specification. The same machine can be obtained with Sturmey-Archer two-speed gear. Price so fitted is £89 10s. Three other similar mounts are staged, fitted with Villiers flywheel magneto engine; these are also fitted with Enfield or Sturmey-Archer gear, or may be obtained with direct belt drive at the figure of £61 19s. 168 lb. is the weight of the heaviest machine made by the firm.
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