A Conversation on Mines, Etc. Between a Father and Son: To which are Added Questions and Answers to Assist Candidates to Obtain Certificates for the Management of Collieries, a Lectures on the Atmosphere and Explosive Gases, Tables of Calculations, Rules of Measurements, Etc., Etc |
Other editions - View all
Conversation on Mines, Etc: Between a Father and Son; To Which Are Added ... William Hopton No preview available - 2017 |
Common terms and phrases
acid gas adopted after-damp air passing air-gates air-passages air-way anemometer atmospheric weight barometer better black-damp boiler breadth carbonic acid carbonic acid gas cause coal colliery cubic feet cubic foot current of air degrees density dial diameter diminished discharged distinct currents divided divisions down-cast engine explosive gas Father feet of air feet per minute figures fire-damp fixed flame friction furnace gases give group of miners horse-power hydrogen ignited inches of mercury increased iron J. B. LIPPINCOTT COMPANY knowledge large current length Lund-hill manager measure mechanical ventilator mines mixture mode of ventilation multiplied natural heat needle nitrogen oxygen person pound pressure propelling force protractor pure air quantity of air quantity of gas reduced road roof rope safety-lamp sexagesimal sight specific gravity square foot square inch strata Suppose surface survey takes place temperature theodolite tram-gates understand up-cast shaft velocity wind yards
Popular passages
Page 280 - 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...
Page 276 - OF SURFACE. 144 Sq. Inches = 1 Sq. Foot 9 Sq. Feet = 1 Sq. Yard 301 Sq. Yards = 1 Perch or Rod 40 Perches = 1 Rood 4 Roods = 1 Acre 640 Acres = 1 Sq. Mile 3. MEASURES OF SOLIDITY AND CAPACITY. DIVISION I — SOLIDITY.
Page 272 - First, who commanded that the ulna, or ancient ell, which answers to the modern yard, should be made of the exact length of his own arm.
Page 278 - 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, should be sold by weight, and not by measure.
Page 264 - Divide the first term of the dividend by the first term of the divisor, and write the result as the first term of the quotient. Multiply the whole divisor by the first term of the quotient, and subtract the product from the dividend.
Page 278 - 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.