Cyclopædia of useful arts & manufactures, ed. by C. Tomlinson. 9 divs, المجلد 41852 |
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الصفحة 643
... portion of the surface of the blank file at each stroke , expanding and levelling it at one operation . When the blank has been forged to the proper length , the tang is also drawn out by cutting into the blank a little on both sides ...
... portion of the surface of the blank file at each stroke , expanding and levelling it at one operation . When the blank has been forged to the proper length , the tang is also drawn out by cutting into the blank a little on both sides ...
الصفحة 646
... portion of the ability he One of the earliest , if not the earliest , file - cutting machine is described in Thiout's " Traité de l'Horo- logie . " Paris . 1740. In this machine the file is attached to a screw - slide , suspended at the ...
... portion of the ability he One of the earliest , if not the earliest , file - cutting machine is described in Thiout's " Traité de l'Horo- logie . " Paris . 1740. In this machine the file is attached to a screw - slide , suspended at the ...
الصفحة 648
... portion of which is derived from the Thames , a river exposed to numerous causes of contamination from the circumstance of its being the recipient of the sewage and drainage of the metropolis , and of the refuse of gas - works and other ...
... portion of which is derived from the Thames , a river exposed to numerous causes of contamination from the circumstance of its being the recipient of the sewage and drainage of the metropolis , and of the refuse of gas - works and other ...
الصفحة 649
... portion of it flows on the surface of the ground , and down the slopes of hills , & c . with considerable rapidity . In such case it dissolves a far less quantity of mineral than it would do if it filtered through the earth , and ...
... portion of it flows on the surface of the ground , and down the slopes of hills , & c . with considerable rapidity . In such case it dissolves a far less quantity of mineral than it would do if it filtered through the earth , and ...
الصفحة 650
... portion of the acid of the salt is also saturated by the carbonate or bicarbonate of lime contained in the water ; and in passing into the state of an insoluble subsulphate or other compound , is precipitated , and in the act of falling ...
... portion of the acid of the salt is also saturated by the carbonate or bicarbonate of lime contained in the water ; and in passing into the state of an insoluble subsulphate or other compound , is precipitated , and in the act of falling ...
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عبارات ومصطلحات مألوفة
acid alumina ammonia annealing applied carbonate carbonic acid centre charcoal cistern clay coal coke colour combustion consists containing copper cubic cylinder diameter disc divided dried edge employed engine exhibited feet fibre files filter fire flat flax flint frame fuel furnace gage glass glue gold hammer heat heckles hydrogen inches iron isinglass joists lead length lime litharge lower machine manganese manufacture material matter means metal method mineral motion moulds naphtha obtained operation oxide passing peat pieces pipe placed plate polishing portion potash powder pressure produced purpose quantity ratchet-wheel retorts round sal ammoniac salt sand screw side silicate silicic acid silver skins soda specific gravity specimens square steel stone substance sulphate sulphur sulphuret sulphuric acid supply surface temperature thick tion tube variety various vegetable vessel vitrification weight wire wood zinc
مقاطع مشهورة
الصفحة 731 - ... one over the fire itself, and a long, fixed one over the flue. The sand-baths supply every gradation of heat, from dull redness, if required, down to a temperature of 100°...
الصفحة 807 - Two measurements of length are made from the poll to the tip of the horn, one on the inside and the other on the outside of the horn.
الصفحة 706 - The vessel being thus hermetically sealed, and all access of air prevented, it may be sent into any climate, without fear of putrefaction, and the most delicate food of one country be thus eaten in its original perfection in a distant region, many months, or even years, after its preparation.
الصفحة 815 - ... the dextrine of a violet, approaching to red, without any mixture of blue. It is unnecessary to say, that during the decomposition, the liquid must be kept constantly in motion. The operation lasts about an hour and a quarter, that is to say, a quarter of an hour for the formation of the paste, one for its dissolution, and the other three-quarters for rendering it soluble. I much prefer this method of forming the paste...
الصفحة 708 - ... the cases were landed with the other stores, and left upon the beach. " Eight years afterwards, in August, 1833, they were found by Sir John Ross in the same condition as they were left ; and he wrote to Mr Gamble at the end of that year, saying that ' the provisions were still in a perfect state of preservation, although annually exposed to a temperature of 92°(?) below and 80° above zero.
الصفحة 667 - In order to fill up the intervals between the joists that support the floor, short pieces of common laths, whose length is equal to the width of these intervals, should be laid in the contrary direction to the joists, and close together in a row, so as to touch one another; their ends...
الصفحة 731 - The interval between them, which gradually increased from the lower to the upper part, was filled with pulverized glass-blowers' pots, to which water enough had been added to moisten the powder, which was pressed down by sticks, so as to make the whole a compact mass. A round grate was then dropped into the furnace, of such...
الصفحة 787 - Yet so comparatively small were the gatherings of the precious metal, that in reckoning the average produce of all parts of the New and Old World for a series of years previous to 1847, it did not amount to the annual value of five millions sterling.
الصفحة 723 - Wood used Initial temperature of water in boiler Temperature of water in tank . Barometer 29-7 mean Extremes of external thermometer . . 32° — 56° Extremes of internal thermometer . . 58° — 68° Dew point ....... 48° mean Area of damper open 168 in.
الصفحة 661 - ... which projected the water only in spurts, and with continual interruption. Such machines, on each movement of the lever, experience a stoppage, during which no water is thrown out ; and because the pipe is fixed, it cannot convey water to remote places, though it may reach a fire at no great distance, where there are doors and windows to afford it a passage. At the same time the workmen are exposed to danger from the falling of the houses on fire, and must remove from them to a greater distance.