Sometimes the wires are covered with the compound alone, and the whole cable after being sheathed is finally covered with tarred tape.
For tying plants to trellises and stakes soft tarred string or raffia (the fibre from the Raphia palm of Madagascar) is used.
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.
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