Daniell sentence example

daniell
  • There are three kinds of primary batteries in general use in the British Postal Telegraph Department, viz., the Daniell, the bichromate, and the Leclanche.
    0
    0
  • The Daniell type consists of a teak trough divided into five cells by slate partitions coated with marine glue.
    0
    0
  • in diameter, to a total resistance of zoo ohms. The actual current required to work the instrument is 3.3 milliamperes (equivalent approximately to the current given by 1 Daniell cell through 3300 ohms), but in practice a current of to milliamperes is allowed.
    0
    0
  • The electrolysis is generally conducted with platinum electrodes, of which the cathode takes the form of a piece of foil bent into a cylindrical form, the necessary current being generated by one or more Daniell cells.
    0
    0
  • Constant cells may be divided into two groups, according as their action is chemical (as in the bichromate cell, where the hydrogen is converted into water by an oxidizing agent placed in a porous pot round the carbon plate) or electrochemical (as in Daniell's cell, where a copper plate is surrounded by a solution of copper sulphate, and the hydrogen, instead of being liberated, replaces copper, which is deposited on the plate from the solution).
    0
    0
    Advertisement
  • As an example of a fairly constant cell we may take that of Daniell, which consists of the electrical arrangement - zinc zinc sulphate solution copper sulphate solution copper, - the two solutions being usually separated by a pot of porous earthenware.
    0
    0
  • Thus in the Daniell cell the dissolution of copper as well as of zinc would increase the loss in available energy.
    0
    0
  • Considered thermodynamically, voltaic cells must be divided into reversible and non-reversible systems. If the slow processes of diffusion be ignored, the Daniell cell already described may be taken as a type of a reversible cell.
    0
    0
  • The earliest formulation of the subject, due to Lord Kelvin, assumed that this relation was true in all cases, and, calculated in this way, the electromotive force of Daniell's cell, which happens to possess a very small temperature coefficient, was found to agree with observation.
    0
    0
  • Thus, the thermal equivalent of the unit of resultant electrochemical change in Daniell's cell is 5.66 - 3.00 =2.66 calories.
    0
    0
    Advertisement
  • It is now evident that the electromotive force of an ordinary chemical cell such as that of Daniell depends on the concentration of the solutions as well as on the nature of the metals.
    0
    0
  • If we connect together in series a single Daniell's cell, a galvanometer, and two platinum electrodes dipping into acidulated water, no visible chemical decomposition ensues.
    0
    0
  • If, instead of using a single Daniell's cell, we employ some source of electromotive force which can be varied as we please, and gradually raise its intensity, we shall find that, when it exceeds a certain value, about 1.7 volt, a permanent current of considerable strength flows through the solution, and, after the initial period, shows no signs of decrease.
    0
    0
  • Hence, if we assume that, in the Daniell's cell, the temperature coefficients are negligible at the individual contacts as well as in the cell as a whole, the sign of the potential-difference ought to be the same at the surface of the zinc as it is at the surface of the copper.
    0
    0
  • By both these methods the single potential-differences found at the surfaces of the zinc and copper have opposite signs, and the effective electromotive force of a Daniell's cell is the sum of the two effects.
    0
    0
    Advertisement
  • Notwithstanding its rugged and mountainous character, Pisidia contained in ancient times several considerable towns, the ruins of which have been brought to light by the researches of recent travellers (Arundell, Hamilton, Daniell, G.
    0
    0
  • Other voltaic standards of electromotive force are in use, such as the Weston cadmium cell, the Helmholtz calomel cell, and the standard Daniell cell.
    0
    0
  • In cases when great accuracy is not required, a Daniell cell can be used as a standard of electromotive force.
    0
    0
  • long, the initial source of electrification being a single Daniell cell.
    0
    0
  • His son, Henry John Patmore (1860-1883), left a number of poems posthumously printed at Mr Daniell's Oxford Press, which show an unmistakable lyrical quality.
    0
    0
    Advertisement
  • JOHN FREDERIC DANIELL (1790-1845), English chemist and physicist, was born in London on the 12th of March 1790, and in 1831 became the first professor of chemistry at the newly founded King's College, London.
    0
    0
  • His name is best known for his invention of the Daniell cell (Phil.
    0
    0
  • Thomas Daniell >>
    0
    0
  • Daniell, R.
    0
    0
  • The effect of one of a Daniell's cell is to increase the tension from 30.4 to 40 6.
    0
    0
    Advertisement
  • He has constructed a capillary electrometer by which differences of electric potential less than o oi of that of a Daniell's cell can be detected by the difference of the pressure required to force the mercury to a given point of a fine capillary tube.
    0
    0
  • Gauss's system of absolute units to electromagnetism, Thomson took up the question, and, applying the principles of energy, calculated the absolute electromotive force of a Daniell cell, and determined the absolute measure of the resistance of a wire from the heat produced in it by a known current.
    0
    0
  • On 10th October the Countess of Essex entrusted to Jane Daniell a locked casket of letters to the Countess from her husband.
    0
    0