h engine, average duty30,000,000
Pounds, 1 foot high.
In 1827, the improved Cornish engine, average duty32,000,000
In 1828, the improved Cornish engine, average duty37,000,000
In 1829, the improved Cornish engine, average duty41,000,000
In 1830, the improved Cornish engine, average duty43,350,000
In 1839, the improved Cornish engine, average duty54,000,000
In 1850, the improved Cornish engine, average duty60,000,000
Consolidated mines, highest duty 182767,000,000
Fowey Consols (Cornwall), highest duty 183497,000,000
United mines, highest duty 1842108,000,000
A species of slide-valve, employed chiefly in the steam-engine, and adapted to bring each steam-port alternately in communication with the steam and exhaust respectively.
1. A large iron bar-wrench used to tighten nuts on bolts.
2. A crow-bar used by masons.
（Carpentry.) Little jack.
A short rafter in the hip of a roof.
A low wall serving to sur
he pressures being nearly balanced, but a small amount of power is necessary to raise the valves from their seats, and by a slight opening a very large steam-way is afforded.
The axe has two oppsite bits or blades.
It is an ancient form of battleaxe, being a favorite weapon with the Franks in the time of Clotaire, seventh century, and with the Danes in the time of Alfred the Great, ninth century.
It is also shown in the sculptures of Karnak, in Egypt.
The battle-axe of the Scythians in the time of Herodotus was double-bitted.
It is the Sacan sagaris.
Seylax, an historian of an age preceding that of Herodotus, compared Egypt to a double-bitted axe, the neck which joins the two heads being at the narrow part of the valley in the vicinity of Memphis.
The double-bitted axe is found in the tumuli and barrows of North America.
It is in three forms: 1, with a circumferential groove for the occupation of the withe or split handle