PACHUCA TANK n.
A high and narrow tank, with a central cylinder for the introduction of compressed air, used in the agitation and settling of pulp (pulverized ore and water) during treatment by the cyanide process; -- so named because, though originally devised in New Zealand, it was first practically introduced in Pachuca, Mexico.…
PARTHENOGENESIS n. 2 definitions
The production of new individuals from virgin females by means of ova which have the power of developing without the intervention of the male element; the production, without fertilization, of cells capable of germination. It is one of the phenomena of alternate generation. Cf. Heterogamy, and Metagenesis.…
PAY n.
, the highest pay or allowance to civil or military officers of a certain rank, without deductions. -- Half pay. See under Half. -- Pay day, the day of settlement of accounts. -- Pay dirt (Mining), earth which yields a profit to the miner. [Western U.S.] -- Pay office, a place where payment is made. -- Pay roll, a…
PHONOGRAPH n.
An instrument for the mechanical registration and reproduction of audible sounds, as articulate speech, etc. It consists of a rotating cylinder or disk covered with some material easily indented, as tinfoil, wax, paraffin, etc., above which is a thin plate carrying a stylus. As the plate vibrates under the influence of…