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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for John Frederick Daniell or search for John Frederick Daniell in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
ng battery.Hat-maker's battery. Bansen battery.Leclanche battery. Callaud battery.Leyden battery. Carbon battery.Magneto-electric battery. Casemate battery.Masked battery. Covered battery.Mountain battery. Cross-fire battery.Open battery. Daniell's battery.Ricochet battery. Double-fluid battery.Siege battery. Electric battery.Single-fluid battery. Electro-magnetic battery.Smee battery. Elevated battery.Stamp battery. En-echarpe battery.Submarine battery. Enfilading battery.Sugar-kee galleries. After charging, a dry wall of chalk was built across the mouths of the chambers; the galleries and shafts were tamped with the same material, and the tamping was extended into the driftway 10 feet on each side of each shaft. Three Daniell's batteries and three sets of wires were used for firing the mines, which was done simultaneously. The mass of rock removed averaged 380 feet in hight, 360 in length, and 80 in thickness. See artesian-well; tunnel; well-boring; and Specific In
Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
. A boatswain's whistle. Cal-laud Bat′ter-y. A double-fluid battery, invented by Jean Armand Callaud, a French electrician; practically a modification of Daniell's. The porous cup or partition is dispensed with, a single cell being used; the separation of the fluids being effected by their difference in specific gravityer the control of the engineer or the conductor, on any car. With Achard's electro-magnetic brake, each carriage in the train is supplied with a battery of six Daniell cells, connected with each other and with the engine foot-plate by means of four insulated wires passing through the whole length of the train. By means of these （Building.) A bracket whose sole or shelf is supported by a pair of flowing scrolls. Con′stant Batter-y. A name applied to the Voltaic battery of Professor Daniell, in which the zinc is separated from the copper by a porous diaphragm, such as bladder or unglazed porcelain, two distinct liquids being used. The part of t<
Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
ompacted and partially drained of its water. It may be made the means for water-marking the paper. The paper passes thence to the first pair of pressing-rollers. A dandy. Dan′iell's Bat′ter-y. The double-fluid battery invented by John Frederick Daniell, F. R. S., who received the Copley medal from the Royal Society in 1837 for this invention; he died in 1845. A jar of glass or earthenware, in which fits a plate of copper bent into cylindrical form. Within the copper is a porous cup used for sharpening pencils, etc. Doub′le-flu′id Bat′ter-y. A galvanic battery in which two fluids are used as exciting liquids. They are kept apart by a porous cup, as in the Daniell's battery, or by gravity, as in Callaud's (see infra). Daniell was the inventor of this form of battery, and received therefore the Copley medal of the Royal Society in 1837. He used sulphuric acid in a porous cup placed in a glass cup containing sulphate of copper. Bunsen's, Grove's, and Callaud's a
Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
ss it was found that, owing to the strength of the acid bath, and the imperfection of the preliminary coating, the iron was corroded, instead of becoming coated with copper. The details of M. Oudry's process have not been made public, but as a preliminary to the plating the articles are covered with three coats of benzine and afterward rubbed with pulverized charcoal, when they are ready for the bath, which is composed of a saturated solution of sulphate of copper. The battery used is Daniell's. The operation requires from three to four days, by which time a deposit about one twenty-fifth of an inch in thickness is formed. The objects, when removed from the bath, are washed in slightly acidulated water, brushed with a wire brush, and rubbed with paper to brighten them, after which they are brushed with ammoniacal acetate of copper, and finally polished with a hard brush well waxed. By this process many of the cast-iron monuments in the city of Paris have been copper-plat
Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
containing dilute acid, soon became sluggish and inert, and were capable of exerting their power for but a limited time without cleansing or renewal. In 1836, Daniell's, the first permanent battery, was invented. This consists of a zinc and a copper element, each immersed in a separate saline solution, and separated by a diaphatinum are immersed in dilute sulphuric acid, and are, by means of an electro-magnetic motor, successively brought into contact with the poles of a single cell of Daniell. The plates become covered by the decomposition of water with oxygen on one side and hydrogen on the other, giving rise to a powerful current in the platinum com. This would keep the metals free from a deposition which soon renders them inactive. The partition may be bladder or biscuitporcelain. Galvanic batteries. Daniell's constant battery (f) is of the class of the sulphate-of-copper batteries. It differs from the preceding in having the sulphate of copper acidulated with one ei
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
s the sponge to part with some of its moisture, and, becoming lighter, the pointer falls. 2. Daniell's hygrometer c determines the moisture of the air by indicating the dew-point, or the temperatu°, the dew-point has been seen at 29°, — making the degree of dryness 61° thermometric. Professor Daniell states that the more accurate mode of expressing the moisture of the air from an obs been empirically constructed by comparison with the indications of the dew-point instrument of Daniell. The British tables for this purpose were constructed by Glaisher; edition of 1856 preferred. sed upon a comparison of the simultaneous readings of the wet and dry bulb thermometers, and of Daniell's hygrometer, taken for a series of years in Greenwich Observatory, in Toronto, and in India. ideas of LeRoy, has gradually led in our own days to the exact psychrometric methods of Dalton, Daniell, and Auguste, there were added, according to the example previously set by Leonardo da Vinci, t
Knight's Mechanical Encyclopedia (ed. Knight), N. (search)
xcess of either metal, the corresponding anode is raised partially or wholly from the solution until the proper combination is produced. Nickeling. Professor Sharples says: The double sulphate of nickel and ammonium, which is the salt that is generally used, may now be had in commerce almost pure. Cast-nickel plates for anodes may also be obtained. The anodes should considerably exceed in size the articles to be covered with nickel. Any common form of battery may be used. Three Daniell's or Smee's cells, or two Bunsen's, connected for intensity, will be found to be sufficient. The battery power must not be too strong, or the deposited nickel will be black. A strong solution of the sulphate is made and placed in any suitable vessel: a glazed stoneware pot answers very well, if the articles to be covered are small. Across the top of this are placed two heavy copper wires, to one of which the articles to be covered are suspended, to the other the anode. The wire leading
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
ture of the inclosed bulb and the mercury sinks. From the different indications of the two thermometers the amount of moisture in the air is derived. Psychrometers. Psychrometers. a is the kind known on the Continent of Europe as August's psychrometer, and in England as Mason's hygrometer. It has a cotton-wick leading to water in a glass below the wet bulb The air circulates freely around the wet bulb. This is now the accepted form of hygrometer, being more convenient than the Daniell's dew-point instrument. (See hygrometer) This is shown at b. It consists of a bent tube with a globe at each end, and is partly filled with ether the remainder of the space with vapor of ether, the air having been expelled. One of the tubes contains a thermometer whose bulb is in the liquid. The stem has another thermometer as a means of comparison. The upper globe being moistened externally with ether, evaporation takes place, producing conducing condensation of ether in the upper bulb
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
oss the face of the file. Single-cut file. Sin′gle-flu′id Bat′ter-y. （Electro-magnetism.) A galvanic battery, having but a single fluid, in which the elements are submerged, or by which they are wetted. The original Voltaic pile was the first of this class. Cruikshank was the first to submerge the elements. Babbington and Wollaston had also submerged elements. See gravity-battery; Cal-Laud-battery. The term is in contradistinction to the double-fluid battery, invented by Daniell. Sin′gle-line. （Saddlery.) A single rein leading from the hand of the driver to a strap forked a little behind the hames, and proceeding thence to the bitrings. This is the favorite mode in most parts of the West of driving horses at work on the farm, or when hauling on the roads with more than a single span or pair. A steady pull brings the horse haw, or to the left, the near side; and a jerk turns him gee, or to the right, the off side. The off horse is fastened to the n
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
copper has nearly ten times the force of the ordinary antimony and bismuth couple. This is remarkable, as the native sulphide is strongly negative. The metal actually used for the negative element is not pure copper, but an alloy of 90 copper and 10 nickel (German silver). The elements are arranged in a manner resembling that of Marcus, their ends being immersed in water heated by means of a gas-burner. Eight or nine of these elements are considered by M. Becquerel to be equal to one of Daniell's. With fifty couples an electro-magnet has been made to sustain a weight of 100 kilogrammes (220 lbs.） Ther′mo-e-lec′tric pile. A series of metallic plates, or a chain of links of alternate metals, — antimony and bismuth are preferred as being farthest apart of the metals in the series Bi., Pt., Pb., Sn., Cu., Ag., Zn., Fe., Sb. By heating one or more of the junctions, electricity is developed. See thermo-electric battery. Ther′mo-graph. An instrument for automatically rec
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