A conversation on Mines ... between a father and son

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Abel Heywood and Son, 1864 - 112 σελίδες
 

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Δημοφιλή αποσπάσματα

Σελίδα 112 - 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 111 - 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 111 - 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 106 - 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 109 - 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 110 - CUBIC MEASURE 1728 cubic inches = 1 cubic foot 27 cubic feet = 1 cubic yard...
Σελίδα 108 - 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 106 - ... 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 107 - 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 107 - 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...

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