rn mill construction. I have mentioned the method of uniting bars of roundiron so as to make long lines of shafting, ifi considering thetheory of the coupling. I have given you an insight intothe principles involved in -a-successful bearing for the shaftsto revolve inf and I have dwelt a little on… … dition by the judicious use of oil. Belts of leather are madeof single thickness of leather for some purposes, and of twoor more thicknesses for the endurance of harder strains. Ingeneral, main driving belts are made double thickness, andbelts for transmission of power to machines, with some…
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