Practical Physics |
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Page 1
... known as an absolute system of units . For example , to measure energy we must take as our unit the energy of some body under certain conditions , but when we agree that it shall always be the energy of a body on which a unit force has ...
... known as an absolute system of units . For example , to measure energy we must take as our unit the energy of some body under certain conditions , but when we agree that it shall always be the energy of a body on which a unit force has ...
Page 17
... known as the C.G.S. system . For magnetic surveying the British Government uses an absolute system based on the foot , grain , and second ; and scientific men on the Continent frequently use a system based on the millimetre ...
... known as the C.G.S. system . For magnetic surveying the British Government uses an absolute system based on the foot , grain , and second ; and scientific men on the Continent frequently use a system based on the millimetre ...
Page 31
... known , as a matter of fact , that a more accurate value is 4'214 × 107 , but at present no one has been able to determine what figure should be put in the decimal place after the second 4 . Errors and Corrections . The determination of ...
... known , as a matter of fact , that a more accurate value is 4'214 × 107 , but at present no one has been able to determine what figure should be put in the decimal place after the second 4 . Errors and Corrections . The determination of ...
Page 32
... known ( see §§ 13 , 14 ) . We may thus , by a series of auxiliary observations , determine a correction to the observed weighing correspond- ing to each known possible error . When the observations are thus corrected they will probably ...
... known ( see §§ 13 , 14 ) . We may thus , by a series of auxiliary observations , determine a correction to the observed weighing correspond- ing to each known possible error . When the observations are thus corrected they will probably ...
Page 33
... known causes , which can be allowed for as corrections , or elimi- nated by repeating the observations under different con- ditions , and errors due to unknown causes , which are called ' accidental ' errors . Thus , in the instance ...
... known causes , which can be allowed for as corrections , or elimi- nated by repeating the observations under different con- ditions , and errors due to unknown causes , which are called ' accidental ' errors . Thus , in the instance ...
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Common terms and phrases
accuracy adjusted apparatus axis battery beam body bulb burette C.G.S. unit calorimeter centimetres centre coefficient coil coincide conductor cross-wire cubic centimetres curve cylinder deflexion density determine disc distance division electricity electromotive force Enter results equal equation error experiment eye-piece force fork formula galvanometer given glass glycerine grammes heat Hence horizontal hydrometer hypsometer inch inertia instrument lens liquid magnet magnetic moment mass means measure mercurous sulphate mercury method microscope millimetre mirror moment of inertia moving needle observations obtained ohms oscillation parallel passes pendulum piece placed plane pointer pole position pressure prism produced quantity radius ratio reading resistance right angles rotation scale pans screw shew shewn slide slider slit specific gravity string suppose surface tangent galvanometer telescope temperature thermometer tube turn velocity vernier vertical vessel vibration volume weight wire zero
Popular passages
Page 581 - It is nearly filled with the solution, and connected to the rest of the circuit by being placed on a clean copper support to which a binding screw is attached.
Page 581 - In determining by this method the constant of an instrument the current should be kept as nearly constant as possible, and the readings of the instrument observed at frequent intervals of time. These observations give a curve from which the reading corresponding to the mean current (time-average of the current) can be found. The current, as calculated by the voltameter, corresponds to this reading.
Page 580 - In employing the silver voltameter to measure currents of about 1 •ampere the following arrangements should be adopted. The kathode on which the .silver is to be deposited should take the form of a platinum bowl not less than 10 centimetres in diameter, and from 4 to 5 centimetres in depth.
Page 581 - The anode is then to be 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 then to be made.
Page 14 - The rate of change of momentum is proportional to the impressed force, and takes place in the direction of the straight line in which the force acts.
Page 574 - Contact is made with the mercury by means of a platinum wire about No. 22 gauge. This is protected from contact with the other materials of the cell by being sealed into a glass tube. 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.
Page 575 - Then insert the cork and zinc rod, passing the glass tube through the hole prepared for it. Push the cork gently down until its lower surface is nearly in contact with the liquid. The air will thus be nearly all expelled, and the cell should be left in this condition for at least 24 hours before sealing, which should be done as follows : — Melt some marine glue until it is fluid enough to pour by its own weight, and pour it into the test tube above the cork, using sufficient to cover completely...
Page 182 - If three forces acting at a point are in equilibrium they can be represented in magnitude and direction by the three sides of a triangle taken in order.
Page 580 - The anode should be a plate of pure silver some 30 square centimetres in area and 2 or 3 millimetres in thickness. This is supported horizontally in the liquid near the top of the solution by a platinum wire passed through holes in the plate at opposite corners. To prevent the disintegrated silver which is formed on the anode from falling on to the kathode, the anode should be wrapped round with pure filter paper, secured at the back with sealing-wax.
Page 574 - Mix the washed mercurous sulphate with the zinc sulphate solution, adding sufficient crystals of zinc sulphate from the stock bottle to ensure saturation, and a small quantity of pure mercury. Shake these up well together to form a paste of the consistence of cream. Heat the paste, but not above a temperature of 30° C.