At the bottom of large boxes, the " bleaching-powder chambers," made of lead, or sometimes of cast-iron protected by paint, of slate or even of tarred wood.
The following empirical formulae for the stiffness of hempen ropes have been deduced by Mono from the experiments of Coulomb: Let F be the stiffness in pounds avoirdupois; d the diameter of the rope In inches, fl = 48d2 for white ropes and 35d2 for tarred ropes; r the effectire radius of the pulley in inches; T the tension in pounds.
For tarred ropes, F =l~ (o.0o6+o.oo1392n+o.ooI68T J
The native practice of conveying wine in tarred skins was deleterious to its flavour, and is now for the most part abolished.
The tanks are commonly constructed of wood lined with lead, or tarred inside, and are placed in terrace fashion each a little higher than the next in series, to facilitate the flow of solution through them all from a cistern at one end to a well at the other.