Practical Electricity and Magnetism |
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Page 4
... connected to that terminal . Should a small leakage be found which would interfere with the accuracy of the measurements , the galvanometer should be placed on blocks of freshly scraped paraffin wax , one under each levelling screw ...
... connected to that terminal . Should a small leakage be found which would interfere with the accuracy of the measurements , the galvanometer should be placed on blocks of freshly scraped paraffin wax , one under each levelling screw ...
Page 10
... CONNECTING WIRES , ETC. 13. All connections should be made with well - insulated copper wire ; and it is not a bad ... connected together , and which have also been amalgamated , dip , pressing on the copper plate . A cover should be ...
... CONNECTING WIRES , ETC. 13. All connections should be made with well - insulated copper wire ; and it is not a bad ... connected together , and which have also been amalgamated , dip , pressing on the copper plate . A cover should be ...
Page 11
... connection is not re- commended for ordinary laboratory work . 15. Metallic Contacts . In order to get a good metallic ... connected together by means of a plug , in the same way as the brass blocks in a resistance box are . The tapping ...
... connection is not re- commended for ordinary laboratory work . 15. Metallic Contacts . In order to get a good metallic ... connected together by means of a plug , in the same way as the brass blocks in a resistance box are . The tapping ...
Page 12
... connected to the terminal on the far side of the key . In using this key , the battery must not be connected to the two tappers , otherwise , when the key is not depressed , it will be short circuited , but to the terminals con- nected ...
... connected to the terminal on the far side of the key . In using this key , the battery must not be connected to the two tappers , otherwise , when the key is not depressed , it will be short circuited , but to the terminals con- nected ...
Page 13
... connected to 5 and 2 to 6 ; contacts 3 and 6 , also 4 and 5 , being permanently connected by copper straps . 1 4 5 6 2 1st Circuit 3 4 2nd Circuit 3rd Circuit FIG . 9 . 1 2 FIG . 8 . ( 2 ) For connecting either of two circuits to a ...
... connected to 5 and 2 to 6 ; contacts 3 and 6 , also 4 and 5 , being permanently connected by copper straps . 1 4 5 6 2 1st Circuit 3 4 2nd Circuit 3rd Circuit FIG . 9 . 1 2 FIG . 8 . ( 2 ) For connecting either of two circuits to a ...
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Common terms and phrases
adjusted altered alternating current ampères angle apparatus axis balance ballistic galvanometer ballistic swing brass bridge wire C.G.S. units calculated calibration capacity centimetre centre charged Clark cell coefficient of self-induction coherer coil condenser connected constant copper curve CuSO Daniell cell determined diameter dielectric discharged earth inductor ebonite effect electro-magnetic waves electrolyte electrometer employed ends experiment fall of potential farads galvano galvanometer needle Hence Ibid induction induction coil instrument insulated iron length lines of force liquid magnetic field magnetizing force magnetometer manganin means mercurous sulphate mercury meter method of measuring microfarads number of turns obtained ohms oscillator Phil placed plate potential difference potentiometer quadrants quantity of electricity R₁ ring rotated scale scale-divisions shown in Fig solenoid specific resistance spot of light standard cell steady currents sulphate terminals tube volt Wheatstone bridge zero zinc zinc sulphate
Popular passages
Page 105 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 167 - Prepare a neutral saturated solution of pure (" pure recrystallized ") zinc sulphate by mixing in a flask distilled water with nearly twice its weight of crystals of pure zinc sulphate, and adding zinc oxide in the proportion of about 2 per cent by weight of the zinc sulphate crystals to neutralize any free acid. The crystals should be dissolved with the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° C.
Page 166 - The volt, which has the value 10s, in terms of the centimetre, the gramme, and the second of time, being the electrical pressure that, if steadily applied to a conductor whose resistance is one ohm, will produce a current of one ampere, and which is represented by 0'6974 ({•£££) of the electrical pressure at a temperature of 15° C.
Page 168 - The glass tube containing the platinum wire should project some way above the top of the marine glue. The cell may be sealed in a more permanent manner by coating the marine glue, when it is set, with a solution of sodium silicate, and leaving it to harden. The cell thus set up may be mounted in any desirable manner. It is convenient to arrange the mounting so that the cell may be immersed in a water bath up to the level of, say, the upper surface of the cork.
Page 144 - Care must be taken that the clock used is keeping correct time during this interval. The solution is now removed from the bowl and the deposit is washed with distilled water and left to soak for at least six hours. It is then...
Page 144 - C. After cooling in a desiccator it is weighed again. The gain in weight gives the silver deposited. To find the current in amperes, this...
Page 144 - The anode is then immersed in the solution so as to be well covered by it, and supported in that position ; the connections to the rest of the circuit are made.
Page 169 - It is convenient to arrange the mounting so that the cell may be immersed in a water bath up to the level of, say, the upper surface of the cork. Its temperature can then be determined more accurately than is possible when the cell is in air. In luing the cell sudden variations of temperature should as far as possible lie avoided.
Page 168 - The ends of the wire project from the ends of the tube ; one end forms the terminal, the other end and a portion of the glass tube dip into the mercury. Clean the glass tube and platinum wire carefully, then heat the exposed end of the platinum red hot and insert it in the mercury in the test-tube, taking care that the whole of the exposed platinum is covered.
Page 167 - Keep the paste for an hour at this temperature, agitating it from time to time, then allow it to cool ; continue to shake it occasionally while it is cooling. Crystals of zinc sulphate should then be distinctly visible, and should be distributed throughout the mass.