. Science of railways . Fig. Cast, Steel Cross-Head for 4-Bar Guides. was thus safely reduced, making them more symmet-rical, lighter, and still much stronger. The weight on driving wheels being such a govern-ing factor in determining the size and design of newlocomotives, this practice of effecting a reduction offrom two thousand to three thousand pounds in thedriving wheels of a locomotive, and permitting thesame weight to be added to the boiler, is a very impor-tant one in American practice. (638) LOCOMOTIVE APPLIANCES. 639 Subsequently the substitution of cast steel forwrought iro
. Science of railways . Fig. Cast, Steel Cross-Head for 4-Bar Guides. was thus safely reduced, making them more symmet-rical, lighter, and still much stronger. The weight on driving wheels being such a govern-ing factor in determining the size and design of newlocomotives, this practice of effecting a reduction offrom two thousand to three thousand pounds in thedriving wheels of a locomotive, and permitting thesame weight to be added to the boiler, is a very impor-tant one in American practice. (638) LOCOMOTIVE APPLIANCES. 639 Subsequently the substitution of cast steel forwrought iron in locomotive cross-heads came into. Fig. 2. Solid Cast Steel Cross-Head for 4-Bar Guides. quite general practice. Figs. 1 and 2 show hollowand solid cast steel cross-heads for four-bar 3 is a cast steel cross-head for two-bar guides.
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