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Σελίδα 39
... sight of . The mode of ventilation has always been to send around the workings a large current of air to take a large quantity of gas away ; but the object of venti- lation to prevent loss of life and property , should be to divide this ...
... sight of . The mode of ventilation has always been to send around the workings a large current of air to take a large quantity of gas away ; but the object of venti- lation to prevent loss of life and property , should be to divide this ...
Σελίδα 89
... sight . Well , when you fix the dial , always have the sight N next to the object you look at , and look through the sight S. That is in going forward . If you fix a dial in a mine , see and always have the sight or letter N next to the ...
... sight . Well , when you fix the dial , always have the sight N next to the object you look at , and look through the sight S. That is in going forward . If you fix a dial in a mine , see and always have the sight or letter N next to the ...
Σελίδα 90
... sight S ( if such objects convey you from the pit into the workings ) ; after the needle has come to a perfect standstill , look at the north- end of the needle ( as one end always , as before stated , points north and the other south ...
... sight S ( if such objects convey you from the pit into the workings ) ; after the needle has come to a perfect standstill , look at the north- end of the needle ( as one end always , as before stated , points north and the other south ...
Σελίδα 91
... sight N. Son : Then if I look at another object through the sight S , and the north - end of the needle stands at 152 degrees , I have only to make an entry of the distance in my book and between object and object ? -Father : That is ...
... sight N. Son : Then if I look at another object through the sight S , and the north - end of the needle stands at 152 degrees , I have only to make an entry of the distance in my book and between object and object ? -Father : That is ...
Σελίδα 92
... sight S will be next to the shaft , and the sight N next to the working - face , always keeping the dial in the manner described ; then look through the sight S , but if you have cause to take a back - sight toward the pit , look ...
... sight S will be next to the shaft , and the sight N next to the working - face , always keeping the dial in the manner described ; then look through the sight S , but if you have cause to take a back - sight toward the pit , look ...
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63 degrees ABEL HEYWOOD accumulation of gas adopted air in mines air passed air-gates air-passage atmospheric weight better black-damp blocks of coal breadth Burradon carbonic acid cause colliery compressed conducted cubic feet current of air diameter diminished distance divided division of air down-cast employer explosive gas explosive power Fatfield father feet of air figure fix the dial floor foot friction produced furnace gases accumulating glad groups of miners Harraton Hebburn ignited impure air knowledge of mines large current large quantity length Lund-hill measure mines?-Father mode of ventilation needle Newbottle number of degrees object OLDHAM STREET parallel ruler person pin mark pressed proportion pure air quantity of air quantity of gas reduced require Risca road roof safety lamp separate distinct currents sexagesimal shaft Sheriff Hill sight splitting the air square strata takes place tram-gates tram-roads TROY WEIGHT up-cast velocity ventilating mines Wallsend whole coal yards
Δημοφιλή αποσπάσματα
Σελίδα 106 - DIVISIONS OF THE CIRCLE. 60 Seconds = 1 Minute 60 Minutes = 1 Degree 30 Degrees = 1 Sign 90 Degrees = 1 Quadrant 360 Degrees, or!2 Signs= 1 Circumference 6. MEASURE OF TIME. 60 Seconds = 1 Minute 60 Minutes...
Σελίδα 105 - January, 1832, it is directed that all coals, cinders, and culm, sold from and out of any ship or vessel in the port of London, or at any place within the cities of London and Westminster, or within the distance of 25 miles from the General Post Office, in the city of London, shall be sold by weight and not by measure.
Σελίδα 105 - Ounce = 437$ — 16 Ounces = 1 Pound (Ib.) = 7000 — 28 Pounds = 1 Quarter (qr.) 4 Quarters = 1 Hundredweight (cwt.) 20 Cwt. = 1 Ton This weight is used in almost all commercial transactions, and in the common dealings of life. The particular weights belonging to this Division are as follow : — cwt.
Σελίδα 100 - All MEASURES OF CAPACITY were first taken from Troy Weight, and several laws were passed in the reign of Henry III., enacting that 81bs. Troy of wheat, taken from the middle of the ear and well dried, should make one gallon of Wine measure, and 8 such gallons make a bushel.
Σελίδα 103 - II.— Measures of Surface. The Imperial Square Yard contains 9 imperial square feet, and the Imperial Square Foot, 144 imperial square inches ; the Circular Foot (that is, a circle whose diameter is 1 foot) contains...
Σελίδα 104 - CUBIC MEASURE 1728 cubic inches = 1 cubic foot 27 cubic feet = 1 cubic yard...
Σελίδα 102 - By this measure are computed the lineal dimensions of all magnitudes, with the exception mentioned below. The length of a mile is not the same in every country. The Scotch and Irish miles were formerly about 1 J English, but are now the same as English.
Σελίδα 100 - ... being the length of the arm or bone from the elbow to the •wrist. A Pace (5 feet), or 2 ordinary steps; a Fathom (6 feet), from the extremity of one hand to that of the other, the arms oppositely extended. It is stated that Henry I., in 1101, commanded that the ulna, or ancient ell, which...
Σελίδα 101 - Gravity, or what is commonly called Weight. 5. Angles. 6. Time. The several denominations of these measures have reference to certain standards, which are entirely arbitrary, and consequently vary among different nations. In this kingdom, Length is a Yard.
Σελίδα 101 - Imperial Standard Yard. The standard square and cubic measures will therefore depend entirely upon it. At present we have no means of ascertaining why this particular length was originally fixed upon ; but, as it is most essential that it should always remain the same, it will be found convenient to refer it to something else, which we have no reason to suppose ever undergoes any change. Now the length of a Pendulum vibrating seconds, or performing...