PALLADIUM n.
is unique in its power of occluding hydrogen, which it does to the extent of nearly a thousand volumes, forming the alloy Pd2H. It is used for graduated circles and verniers, for plating certain silver goods, and somewhat in dentistry. It was so named in 1804 by Wollaston from the asteroid Pallas, which was discovered…
PARTING a. 2 definitions
ting fellow, a partner. [Obs.] Chaucer. -- Parting pulley. See under Pulley. -- Parting sand (Founding), dry, nonadhesive sand, sprinkled upon the partings of a mold to facilitate the separation. -- Parting strip (Arch.), in a sash window, one of the thin strips of wood let into the pulley stile to keep the sashes a…
PARTRIDGE n.
- Partridge pea (Bot.), a yellow-flowered leguminous herb (Cassia Chamæcrista), common in sandy fields in the Eastern United States. -- Partridge shell (Zoöl.), a large marine univalve shell (Dolium perdix), having colors variegated like those of the partridge. -- Partridge wood (a) A variegated wood, much esteemed f…
PATTERN n.
A full-sized model around which a mold of sand is made, to receive the melted metal. It is usually made of wood and in several parts, so as to be removed from the mold without injuring it. Pattern box, chain, or cylinder (Figure Weaving), devices, in a loom, for presenting several shuttles to the picker in the proper s…
PECTORAL a.
Having the breast conspicuously colored; as, the pectoral sandpiper. Pectoral arch, or Pectoral girdle (Anat.), the two or more bony or cartilaginous pieces of the vertebrate skeleton to which the fore limbs are articulated; the shoulder girdle. In man it consists of two bones, the scapula and clavicle, on each side.…