POLARIZATION n.
l, by the deposition upon them of the gases liberated by the action of the current. It is chiefly due to the hydrogen, and results in an increase of the resistance, and the setting up of an opposing electro-motive force, both of which tend materially to weaken the current of the battery, or that passing through the cel…
PONTOON n.
tans, and other machinery, used in careening ships, raising weights, drawing piles, etc., chiefly in the Mediterranean; a lighter. Pontoon bridge, a bridge formed with pontoons. -- Pontoon train, the carriages of the pontoons, and the materials they carry for making a pontoon bridge.
PRELUDE n.
minary part, movement, strain, etc.; especially (Mus.), a strain introducing the theme or chief subject; a movement introductory to a fugue, yet independent; -- with recent composers often synonymous with overture. The last Georgic was a good prelude to the Ænis Addison. The cause is more than the prelude, the effect i…
PRESIDE v.
e of president, chairman, moderator, director, etc.; to direct, control, and regulate, as chief officer; as, to preside at a public meeting; to preside over the senate.