Builder's hardware; a manual for architects, builders and house furnishers . Fig. I 66. Norris Sidney Norris & Co. y. 167. Single Sash-chain,Smith & Egge Mfg. Co. upon the screw for its stability. With an ordinary pulley, theheavier the sash the greater is the possibility of the wheelbeing forced out from its mortise, whereas, with the Norris pulley, the greater the load, the more securely is it wedged in 112 BUILDERS HARDWARE. Chapter vii. place. Another obvious advantage is that it requires just halfthe quantity of screws and amount of labor to set this pulley asit does the ordinar
Builder's hardware; a manual for architects, builders and house furnishers . Fig. I 66. Norris Sidney Norris & Co. y. 167. Single Sash-chain,Smith & Egge Mfg. Co. upon the screw for its stability. With an ordinary pulley, theheavier the sash the greater is the possibility of the wheelbeing forced out from its mortise, whereas, with the Norris pulley, the greater the load, the more securely is it wedged in 112 BUILDERS HARDWARE. Chapter vii. place. Another obvious advantage is that it requires just halfthe quantity of screws and amount of labor to set this pulley asit does the ordinary pulley; and it is said that the carpenterswho have used this, have liked it very much. The labor ofmortising is slightly more than for the ordinary form, but thecompany controlling the patent also manufactures a mortising-machine specially adapted to this kind of work, by which thelabor is greatly reduced. Aside from the labor of mortising,the only possible objection to this sash-pulley seems to be thatit would require a pretty heavy hanging-style to the windowf
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