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achromatic acid action ammonia answer aperture apparatus appears battery bogie boiler brake brass carbolic acid carbon cell centre coil colour connected copper correspondent course cylinder diameter disc electric electromotive force engine English Mechanic experiments eyepiece give glass hand planer hardening havo heat hole hour inch iron Jupiter kindly Lancaster lathe length letter lever light London machine magnet mandrel matter means ment metal method miles minutes mirror motion nitric acid object observed obtained ordinary paper paraffin patent piece pipe plate pressure Proclus quantity query railway readers reflector refractor reply screw seen side silver solution stars steam steel streaks surface telegraph telescope temperature thick tion tool treadle tricycle tube turned vacuum brake vulcanite wheel wire wood yeast zinc
Page 195 - Arsenic and its Preparations. Prussic Acid. Cyanides of Potassium and all metallic Cyanides. Strychnine and all poisonous vegetable Alkaloids and their Salts. Aconite and its Preparations. Emetic Tartar. Corrosive Sublimate. Cantharides. Savin and its Oil. Ergot of Rye and its Preparations.
Page 85 - ... smaller wire owing to the increased radiating surface and mass. After heating, if the wire be examined under a microscope, that part of the surface which has been incandescent will be found covered with innumerable cracks. If the wire be placed between clamping posts, and heated to incandescence for twenty minutes by the passage of an electric current the cracks will be SO enlarged as to be seen with the naked eye; the wire under the microscope presents a shrunken appearance, and is full of deep...
Page 107 - There is scarcely a subject on which a naval architect or shipbuilder can require to refresh his memory which will not be found within the covers of Mr. Mackrow's book."— English Mechanic.
Page 109 - ... experiments to ascertain whether this substance can be extracted from the electric arc, which invariably shows this peculiar spectrum at the positive pole, when it is powerful and occasionally intermittent. For this purpose the carbons were used in the form of tubes, so that a current of air could be drawn by means of an aspirator through either pole, and the products thus extracted from the arc, collected in water, alkalies, and other absorbents. Gases may be led through one of the poles, and...
Page 80 - As to the second question, this is strikingly the case throughout the Atlantic side of temperate North America, in which the weeds have mainly come from Europe ; but it is not so, or hardly so, west of the Mississippi in the region of prairies and plains. So that the answer we are accustomed...
Page 85 - ... for the purpose of assisting the passage of the air from the pores of the metal into the vacuum. The temperature of the wire was gradually augmented at intervals of ten minutes until it became red. The object of slowly increasing the temperature was to allow the air to pass out gradually and not explosively.
Page 169 - But we cannot argue from the reason of the thing, that death is the destruction of living agents, because we know not at all what death is in itself; but only some of its effects, such as the dissolution of flesh, skin, and bones.
Page 85 - ... electric current, the cracks will be so enlarged as to be seen with the naked eye ; the wire, under the microscope, pre.sents a shrunken appearance, and is full of deep cracks. If the current is continued for several hours these effects will so increase that the wire will fall to pieces. This disintegration has been noticed in platina long subjected to the action of a flame by Prof.
Page 150 - Pour on the engraving boiling water from a tea kettle, until the salt and lemon-juice be all washed off; the engraving will then be perfectly clean, and free from stains. It must be dried on the board, or on some smooth surface gradually. If dried by the fire or the sun, it will be tinged with a yellow color.