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Passing Comments
Page 80
Page 81
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AS an indication of the increasing popularity of allmetal bodies, we were interested to hear, in conversation with Mr. Chatfield, of Metropolitan-Cammell-Weyman Motor Bodies, Ltd., that this concern has in hand, at the moment, orders for more than 400 all-metal bodies. Of these, over 100 are for use overseas. I T is only comparatively recently that the system of voltage control has been applied to any considerable extent to private cars. In view of the success of this system it is worth recording that its development to its present high state of efficiency is the result of many years' experience on public passenger vehicles.
NE of the Smallest Commercial vehicles in the
world is the Ry-tecraft SCoota Truck, which, with Its 1 la.p. engine, giVeS aMaximum speed of about 15 m.p.h., and about 70 m.p:g. Apart froth its value as a publicity medium, concerns in a wide variety of trades are seeking delivery of these little lorries, ,which carry quite a reasonable load and are exceptionally easy to con-.
trol. Full details of the chassis were contained in our issue dated October 5.
AMONGST the novelties to be exhibited at the forthcoming Leipzig International Industries Fair will be the Litha puncture indicator, which is fitted about 2 ins, above the ground at the side of a Vre. In case of deflation, the device touches the ground and shows a danger-light signal in the cab or sounds a horn. Then there is a metal-spraying pistol for filling up blow holes in castings. The advantages of this are that there is no distortion, and the patches remain soft, so that they can easily be machined.• Finally, there is a pair of shears for cutting thick materials, such as leather, carpets; etc. This can be onnected to an ordinary lamp socket,
XPERIMEN Mi
TS with oil engines Carried t by "Certain makers appear to show that. bearing failures can be attributed to high conaPiesSion,. and that in those types in which this pressure isComParatiVely low, the bearings are likely to give little trouble, because they then experience a partial rest between the periods of heavy loading, and so do not become unduly heated. The failure of some bronze bearings lined With white metal is said to be due to the unequal coefficients of expansion of the metals. .
Tnature of the exhaust from compression-ignition engines is to some extent, influenced by the dimeAsions• of the silencer. Itis of interest that at least one manufacturer stipulates that silencers employed for its engines should not exceed a stated size. When a larger expansion chamber has been used it has been found that the exhaust is smoky and the smell more pronounced, which seems to point towards the final stages of combustion taking place after the gases have left the cylinders. Apparently a large and accordingly cold silencer terminates the process prematurely.