The main pit was a vertical shaft.
All tin, except a small quantity produced by the shaft furnace process from exceptionally pure stream tin ore, requires refining by liquation and "boiling" before it is ready for the market.
The breaking short of the shaft of the assegai when the weapon was used at close quarters was already a common practice among the Ama-Zulu, but Chaka had the shaft of the assegais made short, and their blades longer and heavier, so that they could be used for cutting or piercing.
A shaft of brilliant sunlight fell through the dusty layers of a horse chestnut tree, landing on the velvet vows of her shoes.
Although redundant, the wallower was left on the upright shaft.
The nave arcades are of four bays, with octagonal shafts, molded capitals and bases, and pointed arches.
There were many men ready on the last call for volunteers to descend the shaft.
Two of the troykas were the usual household sleighs, the third was the old count's with a trotter from the Orlov stud as shaft horse, the fourth was Nicholas' own with a short shaggy black shaft horse.
A central shaft descended 35 ft.
If the workable areas are poor, and appear only at long intervals along the outcrop, the chances of discovering richer areas by a shaft are very small.
A frame of wood or steel, erected at the shaft mouth, and rarely employed except for deep shafts of small cross-section or when the mine cars (tubs) are small, as in many parts of Europe.
To the west of the main shaft were three square pits with horses and their harness, and by them two pits with men's skeletons.
From the prop shaft we ascended up the line to meet with Bob's boat.
The roller chain is used to transmit motion between rotating shafts via sprockets mounted on the shafts.
"Now maybe you'll pay attention," he said and threw the shaft of the arrow.
Thomas, and a monolithic shaft to the memory of General John Ellis Wool (1784-1869), who served with distinction in the War of 1812 and in the Mexican War, and in the Civil War commanded for a time the Department of Virginia.
On the same shaft with P is fixed a brake-wheel furnished with a powerful brake B, by the proper manipulation of which the speed of paying out is regulated, the pull on the cable being at the same time observed by means of D.
The shaft-graves in the Mycenae circle are also a late type, paralleled in the later Cnossian cemetery.
1-2 in Crete, the shaft-graves in the Mycenae circle, the Vaphio tomb, &c., to the 16th and 15th centuries B.C., and Period III.
The campanile is usually a plain brick shaft with shallow pilasters running up the faces.
It is the centre of an important gold-field, the reefs of which improve at the lower depths, the deepest shaft on the field being 2558 ft.
From the girdle hung the single-edged missile axe or francisca, the scramasax or short knife, a poniard and such articles of toilet as scissors, a comb (of wood or bone), &c. The Franks also used a weapon called the framea (an iron lance set firmly in a wooden shaft), and bows and arrows.
Since the mineral occurs in definite veins, a more satisfactory and economical method of working would be that adopted in metalliferous mines, with a vertical shaft, cross-cuts, and levels running along the strike of the vein: the mica could then be extracted by overhead stopping, and the waste material used for filling up the worked-out excavations.
The shaft, resting upon arches supported by four cast iron columns about 9 ft.
Either to the simple lateral tail feathers with a few rami only, developed only on one side of the shaft and of uniform metallic coloration - or to the simple contour feathers of small size, with the usual symmetrical series of numerous rami right and left of the shaft and no remarkable colouring.
Either in the shaft furnace or the reverberatory; the former is the better suited to stream tin, the latter to lode tin, but either ore can be smelted in either way, although reverberatory practice yields a purer metal.
Shaft furnace smelting is confined to those parts of the world where charcoal can still be obtained in large quantities at moderate prices.
The furnace consists of a shaft, circular (or more rarely rectangular) in plan, into which alternate layers of fuel and ore are charged, an air blast being generally injected near to the bottom of the furnace through one or more tuyeres.
The genus Machaeropterus, consisting of four species, is very remarkable for the extraordinary form of some of the secondary wingfeathers in the males, in which the shaft is thickened and the webs changed in shape, as described and illustrated by P. L.
If the outcrop of the vein or bed is accessible the shaft may be inclined and sunk to follow the deposit.
This is in general a cheaper and quicker method of development for inclined deposits than by a vertical shaft, and it has the added advantage that much information as to the character of the deposit is obtained as the shaft is sunk.
In the case of very thick beds and mass deposits the main shaft or tunnel will preferably be located in the foot-wall.
I and 2 illustrate the development of a metal-vein by two adits, two inclined shafts in the lode, and by a deep vertical shaft connected with the lode by horizontal cross cuts.
This is similar to shaft hoisting, except that the grades are often quite flat.
Independent drums, on the contrary, are loose upon their shaft, and are thrown on or off by tooth or friction clutches.
The crook is usually richly ornamented, and is divided from the shaft by a boss; the shaft is commonly separated into sections by rings, so that it can be taken to pieces.
In the Public Square is a soldiers' and sailors' monument consisting of a granite shaft rising from a memorial room to a height of 125 ft., and surmounted with a figure of Liberty; in the same park, also, is a bronze statue of Moses Cleaveland, the founder of the city.
In diameter, passing from the bull-wheel shaft over a grooved wheel known as the crown-pulley, at the summit of the derrick.
Above the shaft comes the arcaded bell-chamber, frequently built of Istrian stone; and above that again the attic, either round or square or octagonal, carrying either a cone or a pyramid or a cupola, sometimes surmounted by a cross or a gilded angel which serves as a weathercock.
The famous Venetian pozzi, or wells for storing rain-water from the roofs and streets, consisted of a closed basin with a water-tight stratum of clay at the bottom, upon which a slab of stone was laid; a brick shaft of radiating bricks laid in a permeable jointing material of clay and sand was then built.
At some distance from the shaft a square water-tight wall was built, and the space between it and the shaft was filled in with sand, which was purified of all saline matter by repeated washings; on the ground-level perforated stones set at the four corners of the basin admitted the rain-water, which was discharged from the roofs by lead pipes; this water filtered through the sand and percolated into the shaft of the well, whence it was drawn in copper buckets.
Let p be the mean pressure in pounds per square inch, calculated from an indicator diagram taken from a particular cylinder when the speed of the crank-shaft is n revolutions per second.