English Mechanic and World of Science: With which are Incorporated "the Mechanic", "Scientific Opinion," and the "British and Foreign Mechanic.", Band 15

E. J. Kibblewhite, 1872

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Seite 54 - Wherefore I perceive that there is nothing better, than that a man should rejoice in his own works; for that is his portion: for who shall bring him to see what shall be after him?
Seite 19 - Constant of an engine is found by multiplying the area of the piston in square inches by the speed of the piston in feet per minute and dividing the product by 33,000. It is the power the engine would develop with one pound mean effective pressure. To find the horse-power of the engine, multiply the MEP of the diagram by this constant.
Seite xii - Moor being directly attributable to the presence of the gas-pipe in proximity to the conductor. Nor would there have been any danger from fire by the ignition of the gas if all the pipes used in the interior of the buildings had been made of iron or brass instead of lead ; for all the cases of the ignition of gas by lightning which have come under my observation have been brought about by the fusion of lead pipes in the line of discharge. The substitution of brass and iron, wherever lead is used...
Seite 17 - URIAH A. BOYDEN, ESQ., of Boston, Mass., has deposited with THE FRANKLIN INSTITUTE the sum of one thousand dollars, to be awarded as a premium to "Any resident of North America who shall determine by experiment whether all rays of light,* and other physical rays, are or are not transmitted with the same velocity.
Seite 83 - ... or fungus life. The first class contains only two substances, carbolic and cresylic acids. In the second class, also, there are only two compounds, chloride of zinc and bichloride of mercury. In the third class there are five substances, lime, sulphate of quinine, pepper, turpentine, and prussic acid. In the fourth class is included the remaining twentyfive substances. The acids, while not preventing the production of vibrio life, have a marked tendency to promote the growth of fungus life.
Seite 71 - When the bottle or decanter has grown warm, gently strike the stopper on one side, and then on the other, with any light wooden instrument ; then try it with the hand : if it will not yet move, place it again before the fire, adding another drop of oil.
Seite 45 - The ether will only dissolve a certain amount of the glue : consequently, the solution cannot be made too thick. The glue thus made is about the consistency of molasses, and is doubly as tenacious as that made with hot water. If a few bits of indiarubber, cut into scraps the size of...
Seite 144 - No question asking for educational or scientific information is answered through the post. 6. Letters sent to correspondents, under cover to the Editor, are not forwarded, and the names of correspondents are not given to inqnirers.
Seite 84 - ... vibrios immediately, and completely prevented their regaining it during the time the experiments were conducted : — Cresylic acid. The second class contains those compounds which nearly destroyed the locomotive power of all the vibrios present when added, and afterwards only one or two could be seen swimming about in each field : — Carbolic acid, sulphate of quinine, chloride of zinc, and sulphuric acid. The third class are those which acted injuriously on the vibrios on their addition, leaving...
Seite 93 - Letters sent to correspondents, under cover to the Editor, are not forwarded, and the names of correspondents are not given to Inquirers. •«• Attention Is especially drawn to hint No. 4. Th...

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