Aust. A heading in advance of the ordinary bords. A leading bank.
Fay

An insulated wire strung separately or as a twisted pair, used for
connecting the two free ends of the circuit of the blasting caps to the
blasting unit. See also:leads

lead lap

a. A gem cutter's lap, of lead, copper, or iron; also, the entire machine.
Standard, 2
b. In mechanics, a lap of lead charged with emery and oil. Fay

lead metacolumbate

Pb(CbO₃ )₂ ; a ferroelectric material with a Curie
temperature of 570 degrees C. The material can be polarized to obtain
piezoelectric properties. Uses include high-temperature transducer
applications, sensing devices, and accelerometers.
Syn:lead metaniobate

lead metaniobate

See:lead metacolumbate

lead metasilicate

See:alamosite

lead motorman

In ore dressing, smelting, and refining, a person who operates a small
electric locomotive (motor) to haul pots of molten lead bullion from a
blast furnace to refining kettles for the separation of copper, antimony,
silver, and other metals contained in the lead bullion. DOT

lead niobate

Pb(NbO₃ )₂ ; a ferroelectric compound having properties that
make it useful in high-temperature transducers and in sensing devices. The
Curie temperature is 570 degrees C. Dodd

lead ocher

See:massicot; litharge.

lead of a switch

The distance measured on the main line from the point of switch to the
point of frog. Also called frog distance. Kiser

lead rail

The lead rail of an ordinary mine switch is the turnout rail lying between
the rails of the main track. Kiser

leads

The wires, forming part of an electric detonator, to which the shot-firing
cable is attached. BS, 12

lead selenide

See:clausthalite

lead silicate

See:alamosite

lead spar

See:cerussite; anglesite.

lead sulfide

See:galena; glance.

lead tantalate

PbTa₂ O₆ ; a compound believed to have ferroelectric
properties and of possible interest as a special electroceramic. The Curie
temperature is 260 degrees C. Dodd

lead tree

A crystalline deposit of metallic lead on zinc that has been placed in a
solution of acetate of lead. Standard, 2

lead-uranium ratio

The ratio of lead-206 to uranium-238 and/or lead-207 to uranium-235,
formed by the radioactive decay of uranium within a mineral. The ratios
are frequently used as part of the uranium-thorium-lead age method.
AGI

lead vitriol

See:anglesite