The Colliery Manager's HandbookVan Nostrand, 1904 |
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Seite 96
... stroke . The smaller trépan ( Figs . 43-46 ) requires modification in its construction , according to the nature of the material to be cut . If soft , the bar to which the teeth are attached is suspended by a fork of wrought iron , but ...
... stroke . The smaller trépan ( Figs . 43-46 ) requires modification in its construction , according to the nature of the material to be cut . If soft , the bar to which the teeth are attached is suspended by a fork of wrought iron , but ...
Seite 96
... stroke of 60 inches , driving , through gearing , conical winding drums , 14 to 24 feet in diameter and 12 feet wide , which lift cages carrying 6 tons of ore at the rate of a mile in one and a half minutes . ( 3 ) 25 gold mines in ...
... stroke of 60 inches , driving , through gearing , conical winding drums , 14 to 24 feet in diameter and 12 feet wide , which lift cages carrying 6 tons of ore at the rate of a mile in one and a half minutes . ( 3 ) 25 gold mines in ...
Seite 131
... stroke , to ascertain which multiply the load by the leverage of the winding drum , and also set off vertically the number of strokes in the winding . The full weight at the lift is ( 10,528 + 4,080 ) x 8'12 the leverage = 118,617 foot ...
... stroke , to ascertain which multiply the load by the leverage of the winding drum , and also set off vertically the number of strokes in the winding . The full weight at the lift is ( 10,528 + 4,080 ) x 8'12 the leverage = 118,617 foot ...
Seite 132
... stroke it will be { 6,048 + ( 17 x 8 ) } x 8'1250,214 1. At the end of the second stroke it will be { 6,048 + ( 34 x 8 ) } x 812 the leverage = 51,318 4 , and so on , the number of foot- pounds increasing regularly 1,104'3 at each stroke ...
... stroke it will be { 6,048 + ( 17 x 8 ) } x 8'1250,214 1. At the end of the second stroke it will be { 6,048 + ( 34 x 8 ) } x 812 the leverage = 51,318 4 , and so on , the number of foot- pounds increasing regularly 1,104'3 at each stroke ...
Seite 135
... stroke then must be 30 x 2,240 19,047 pounds must be reduced at the next or 3rd stroke - 33,129.2 4,417 2 28,712 . remaining strokes will be : - 28,712 162338 = 17,686 5 . The inclination for the = 1 in 3'799 . At the commencement of ...
... stroke then must be 30 x 2,240 19,047 pounds must be reduced at the next or 3rd stroke - 33,129.2 4,417 2 28,712 . remaining strokes will be : - 28,712 162338 = 17,686 5 . The inclination for the = 1 in 3'799 . At the commencement of ...
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airway anemometer angles arrangement Barnsley boiler bottom brattice cage carbonic carbonic acid centre chain coal measures Coal Seam Colliery column condenser cubic feet cylinder Davy lamp depth downcast dumpy level engine explosive feet in diameter feet per minute fire-damp fixed flame flange friction gallons gauze glass holes horizontal horse-power inches in diameter incline instrument iron lamp Lancashire boiler length lever lift lower means minerals mines Mueseler lamp opening ordinary passing pillar pipe piston placed plate plunger pressure props pump quantity of air rails regulator revolutions per minute ring rivets road rods roof rope safety-lamp screw shown in Fig side sinking South Wales speed split sprags square foot square inch steam steam-cylinder stroke surface temperature theodolite thick timber tube tubs underground upcast shaft upper valve velocity ventilation vertical water-gauge wayleave weight wire yards
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Seite 829 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Seite iii - THE COLLIERY MANAGER'S HANDBOOK: A Comprehensive Treatise on the Laying-out and Working of Collieries, Designed as a Book of Reference for Colliery Managers, and for the Use of Coal-Mining Students preparing for First-class Certificates. By CALEB PAMELY, Mining Engineer and Surveyor; Member of the North of England Institute of Mining and Mechanical Engineers ; and Member of the South Wales Institute of Mining Engineers. With nearly 500 Plans, Diagrams, and other Illustrations.
Seite 725 - Transactions of the North of England Institute of Mining Engineers, and accompany a short paper by Mr.
Seite 590 - Law. — The temperature remaining the same, the volume of a given quantity of gas varies inversely as the pressure.
Seite 52 - Briavels, of the age of twenty-one years and upwards, who shall have worked a year and a day in a coal or iron mine within the said Hundred of St. Briavels, shall be deemed and taken to be free miners for the purposes of this Act.
Seite 814 - ... more perfectly, after tightening the collar, D, by the clamping screw c. There is also a clamping screw, c, for fixing the upper, or vernier, plate to the lower plate, and a tangent screw, t, for giving the vernier plate a slow motion upon the lower plate, when so clamped.
Seite 122 - COLLIERIES. — Undoubted evidence exists of the explosion of fire-damp in collieries through sparks from atmospheric electricity being led into the mine by the wire ropes of the shaft and the iron rails of the galleries. Hence the head gear of all shafts should be protected by proper lightning conductors.
Seite 12 - Llano Estacado." The boring is done by means of oak poles, 1| inches in diameter, in 16 feet sections joined in twos by heavy iron straps. Each boring rod is therefore 32 feet long with a male screw at one end and a female screw at the other, both having very strong and heavy threads. The drill has a straight edge of 3.^ inches, and is attached to an iron rod 30 feet long and 1£ inch in diameter. To the upper end of this rod (or sinker) is attached a pair of iron slips, having a play of 16 inches...
Seite 839 - ... position selected as one of the points in the desired line, measure the horizontal angle from the said line to the sun or fixed star (whichever is used), when it is not near the highest or lowest point of its apparent daily course, and take also the altitude, adjusting the intersection of the hairs of the telescope to it, in some marked and definite manner. Leave the limb clamped, and let the instrument remain quite undisturbed until the sun or star is approaching the same altitude at the other...
Seite 460 - When the chest piston has traveled a certain distance, a port on the opposite end is uncovered and steam there enters, stopping its further travel by giving it the necessary cushion. In other words, when the rotative motion is given to the auxiliary or valve driving piston by the mechanism outside, it opens the port to steam admission on' one end, and at the same time opens the port on the other end to the exhaust.