In front of the gate are fixed the parallel rollers, which move upon the lower and upper planes of the recess, equal in length to the width of the recess. RS, the right gallery, built parallel to the lock walls. TU, the left ... These galleries may be built in any convenient form or figure, either of wood, brick, stone, or cast iron. V WXYanbsp;...
|Title||:||The Repertory Of Arts And Manufactures: Consisting Of Original Communications, Specifications Of Patent Inventions, And Selections Of Useful Practical Papers From The Transactions Of The Philosophical Societies Of All Nations, &c. &c|