Rear frame suspension that has stood the test of time is again embodied in the Edmund-Biackburne.
Saddle and interconnected footboards are insulated from the rigid portion of the Edmund frame. The spring tension is adjustable by the slots in the rear supports.
Edmund. (Stand 145.)
2¾ h.p. Blackburne; 71x88 mm. (349 c.c); single-cylinder four-stroke; side-by-side valves; drip feed lubrication; Amac carburetter; E.I.C. chain-driven magneto; two-speed Burman gear; chain and belt drive; Dunlop 26x2 ¼ in. tyres. Price £105.
C. Edmund and Co. (1920), Ltd., Crane Bank, Chester.
Both front and rear springing on the Edmund is now very advanced for a lightweight machine. The rear system of springing is no new untried device; but, for the benefit, of those who are newcomers to the pastime, we will recapitulate. Briefly, the top tube, to which is attached the petrol tank, is pivoted at its forward end. Linked to the rear end is the saddle tube, which slides in the outer rear main tube in phosphor bronze bushes, and to which, at its lower end, are fixed the footrests. This movement is controlled by two stiff leaf springs attached to special rear carrier stays. With these stays are incorporated two auxiliary coil springs which are instantly adjustable in tension. Thus, in effect, only the rider and the tank are insulated, and, therefore, belt tension does not vary. The front forks utilise parallel motion links of the usual type, but the spring is a vertical laminated one. The friction generated by this spring against the upper shackle pin effectively damps all rebound.
2¾ h.p. J.A.P.; 70x76 mm. (292 c.c); single-cylinder four-stroke; side-by-side valves; drip feed lubrication; Amac carburetter; B.T.H. chain-driven magneto; two-speed Burman gear; chain and belt drive; Dunlop 26x2¼ in. tyres. Price £95.
This model is also fitted with the Edmund patent type of rear springing, but, pending the substitution of the new fork at a later date, Druid forks are used. It is also shown as an all-chain drive sporting model with Enfield two-speed.
The Motor Cycle, December 2nd, 1920.
