. India rubber world. appears to be made by a glancing ballfrom a machine gun. The tires certainly proved their worth andquality, for Blanco never stopped. Firestone tires saved himfrom being taken prisoner. Other manufacturers desiring to invade the Mexican marketwill take their cue from the above paragraph and see that theirtires are proof against any and all of the projectiles used inmodern warfare. 22 THE INDIA RUBBER WORLD [October 1. 1913. RUBBER QUARTER-TIPS ON LEATHER HEELSAND SOLES. THE wonderful increase in the demand for rubber-soled shoes,•* some account of which appeared in a rece
. India rubber world. appears to be made by a glancing ballfrom a machine gun. The tires certainly proved their worth andquality, for Blanco never stopped. Firestone tires saved himfrom being taken prisoner. Other manufacturers desiring to invade the Mexican marketwill take their cue from the above paragraph and see that theirtires are proof against any and all of the projectiles used inmodern warfare. 22 THE INDIA RUBBER WORLD [October 1. 1913. RUBBER QUARTER-TIPS ON LEATHER HEELSAND SOLES. THE wonderful increase in the demand for rubber-soled shoes,•* some account of which appeared in a recent number ofThe India Rubber World, and the later development of specialapplications of rubber portions or insertions in leather shoes formodern dancing,* seem to have started a sort of epidemic amongshoe manufacturers to experiment in other combinations ofrubber and leather in their output. Quite recently it was reported that some shoe manufacturerswere making the heels of their shoes with a quarter-tip of Sole .\xn Heel of a Compound ok Rubber and Leather withRubber Tips Vulcanized as Shown. this tip being placed on the outside and back of the heel, the placewhere probably eighty per cent, of the people wear their heelsmost. It is claimed that this spot bears the initial impact inwalking, and that the quarter-tip therefore serves all the purposesof a full rubber heel lift, while the rest of the heel tread, ofleather, prevents the slipping which forms the chief defect of therubber heel. The quarter-tip has also another argument in its favor. It isvery generally conceded that rubber wears better and longer thanleather. If this be granted, it stands to reason that a heel havingtwice the durabihty where the most wear comes will probablywear truer and more even than one which is homogeneousthroughout its entire tread, thereby overcoming the tendency torun over or run down at the heel. The quarter-tip is a piece of rubber soling shaped to conformto the curve of the heel.
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