.Motors and Motorin
Automatic Tyre Pumping. Efficient Car Testing. 15.7 h.p. Crossley.
IfAND-111ANKING of the engine of a motor-car died a :natural death, but not before it was time: The grease =cup- gave way IfAND-111ANKING of the engine of a motor-car died a :natural death, but not before it was time: The grease =cup- gave way to theAalitiCiitot gun,-how these are tightly berhg super- seded by centralized chassis lubrication. So progress con- tinues, and one of the chief and rightful aims is to reduce as much as possible inconvenience and unnecessary labour in the driving and maintenance of the modern car. One of the features which has, however,. made but little advance is tyre pumping... On-th-es,great majority cifila-is:-=in fact, the minority could, ir,ife counted on ones fingers—sold-to-day and ore-Very nationality tyre pumping must be done by hand. Often the pump supplied with the kit is ineffective, or; if reliable, requires considerable physical effort, while it is seldom carried in a handy place on the car. It is true that the tyre of to-day, with its improved construction and operation under much more favourable conditions than heretofore, such as smoother drive, four-wheel braking, better road surfaces and so forth, is exceptionally reliable and gives mileages which a few years ago would"- have been thought quite impossible of attainment. On the other hand, the balloon or medium pressure tyre, as .was foretold, is_universally,adopted on cars, and this-type -undoubtedly requires‘rncire periodical attention than- the Old high-pfesSiire -kind ,did. -This 43--One of its few drawbacks. A rubber tube has a 'certain permeability to air under pressure, which means that apart from any question of leakage from puncture or excessive deterioration a drop in pres.sure is automatically taking place all the time.
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