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Are Liquid-filled THE driving wheels of some Tractor Tyres More I trac,tors. can be filled with
efficient . . fluid to add to their weight and
• consequent grip, but lately an important American tyre Maker has developed a method of filling tractor tyres with liquid instead of air and has supplied a special fluid for this purpose, although calcium-chloride solution, which is also an anti-freeze, has been found to be fairly satisfactory. As hand pump of spetiaI design removes practically all air from the tube, which is then filled with the liquid. It is claimed that the tyres will, as a result, give longer life and afford maximum traction because slip and spin are reduced to a minimum. Tests carried out on a tractor of 900 lb.. drawbar pull showed adhesion loss of 45 per cent, with air-filled tyres. 23 per cent. with a maximum of three parts liquid and one of air, and 18 per cent. liquid-filled. It was shown that for each additional 2 lb. of rear-wheel weight,
• the drawbar pull increased by 1 lb. A liquid-filled tyre is not quite the same inaction as a solid one, for the reason that pressure at any point is distributed over the whole wall and, in the circumstances, this would appear to be an advantage, A Simple Mechanized "IsitILTCTURES of steel tub
System for Brazing k-iing lend themselves. to
Tubes brazing processes,' and can be
employed in various ways in. motor vehicles, particularly of the lighter classes. In this connection, a notable advance has lately been made in production technique by the Coventry-Eagle Cycle and Alotor Co., Ltd., and although in this case it Specifically concerns cyclesand motorcycles, the method may be applied in other directions. Hitherto frames have been brazed by hand, calling for a high degree of skill, for even a slight error will result in a defective joint. The method now employed is full mechanization of the process, the brazing of every jointbeing exactly controlled by electrical timing. Haying been assembled and loaded with brazing material carried in special cartridges and placed at the required points, the frames are mounted in jigs carried on a conveYor belt. On this they pass through a series of gas-heated raffles; at each of ilieSe the jigs are automatically turned to bring the frames into a fresh position: The time far each Lob is pre-determined and 'pasitively controlled; sb that uniformity and accuracy are ensured. Sir William Ftootes, Q.PEAKING at the 36th
Issues Grave "o.g.m. of Humber, Ltd„ Warning on July 17, the chairman, Williarn Routes,
after referring to the signal contribution .to victory made by the Rootes Group, in which the Humber concern and its subsidiaries played a notable part, uttered a few. words of warning. He said that nei 'industry has to plan quite so far ahead and stake so much on its plans as, does !he motor industry. Yet none is more heavily taxed at every stage, from -the raw materials to the operating of the finished vehicles on the roads of Britain. In none, also, do the results of taxafon fall more heavily on the user. it was his confident belief that three things are necessary in order that the industry should prosper. First, we should not have a penal system of taxation and the general rate on motor vehicles should be substantially lowered; secondly, we should have adequate roads: The third factor is that we must ensure volume production here which will enable us to compete on equal. terms abroad.
Visitors from Abroad THAT important_ visitors
Should Inspect Our from overseas should have
Works their attention focused on . industrial Britain is the suggestion of Mr. H. D. Simmons of the S.M.M.T., as conveyed in an address to the Streatham Rotary -Club. These visitors are likely to influence, or are directly interested in, British products for civerseas markets, and must be shown, with pride, our modern industrial plants, rather than ruins, museums, etc., which were the goal of those who came pre-war. Our works, etc., most become the Nation's shop window.