Scully blue book: catalogue of iron, steel, machinery, heavy hardware, tools and supplies, with valuable and accurate reference tables (1910)
Scully Steel & Iron Co. · Scully Steel & Iron Co. · leaf 28
ere the w^ear is exceptionally severe, wehave designed a special heavy tread, using a muchthicket steel base plate than formerly. The verticalsteel teeth are also made longer and so spaced as toreduce the openings through which the lead mighthave a tendency to flow. This tread will withstandthe… … One-half Showing Steel Base.The Other After the Lead has been Applied. The UNIVERSAL SAFETY TREAD is constructed of a heavysteel base plate in 4\^hich openings are punched, forming rows of verticalsteel teeth. The lead strands are then rolled in and clamped in posi-tion by these teeth and clinched…