Practical Physics |
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Page 46
... Suppose that in reading the galvanometer we cannot be sure of the position of the needle to a greater accuracy than a quarter of a degree . Let us , there- fore , consider the following question : What is the effect upon the value of a ...
... Suppose that in reading the galvanometer we cannot be sure of the position of the needle to a greater accuracy than a quarter of a degree . Let us , there- fore , consider the following question : What is the effect upon the value of a ...
Page 50
... suppose we are endeavouring to prove that the pressure of a given mass of gas at constant volume varies as the absolute temperature , we lay off as abscissę the observed values of the temperature , say in degrees centigrade from ...
... suppose we are endeavouring to prove that the pressure of a given mass of gas at constant volume varies as the absolute temperature , we lay off as abscissę the observed values of the temperature , say in degrees centigrade from ...
Page 51
... suppose we wish to represent the changes . of volume of one gramme of water consequent on changes of temperature between o ° C. and 10 ° C .; we may regard the horizontal line through the origin as indicating volumes equal to that of ...
... suppose we wish to represent the changes . of volume of one gramme of water consequent on changes of temperature between o ° C. and 10 ° C .; we may regard the horizontal line through the origin as indicating volumes equal to that of ...
Page 53
... suppose the scale to be pro- duced backward to the left to twice its own length , and read from this index . Suppose , now , we want to multiply this by 85. The actual distance on the slider up to division 85 is log 8.5 . To get log 85 ...
... suppose the scale to be pro- duced backward to the left to twice its own length , and read from this index . Suppose , now , we want to multiply this by 85. The actual distance on the slider up to division 85 is log 8.5 . To get log 85 ...
Page 56
... Suppose that the whole length contains d divisions ; then , since log 10 = 1 , log a = x / d . In the rule already referred to d = 500 , so that log a = 2x / 1000 . This rule also contains a device whereby the logarithms , sines , and ...
... Suppose that the whole length contains d divisions ; then , since log 10 = 1 , log a = x / d . In the rule already referred to d = 500 , so that log a = 2x / 1000 . This rule also contains a device whereby the logarithms , sines , and ...
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Common terms and phrases
accuracy adjusted apparatus axis axis of rotation beam body bulb calorimeter centimetres centre circle coil coincide colour convex lens cross-wire cubic centimetres curve deflexion density determine disc distance division drying tubes electricity electromotive force Enter results equal equation experiment Experiment.-Determine eye-piece fixed focal length force formula galvanometer given glass glycerine grammes heat Hence horizontal hydrometer hypsometer inertia instrument lens light liquid magnet mass means measure mercury method micrometer microscope millimetre mirror moment of inertia moving object-glass observations obtained oscillation parallel passes pendulum piece placed plane pointer pole position pressure prism quantity radius ratio rays reading refraction refractive index resistance right angles rotation scale pans screw shew shewn slide slider slit specific gravity string suppose surface telescope temperature thermometer tube turn vapour velocity vernier vertical vessel vibration volume weight wire zero
Popular passages
Page 575 - 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 575 - 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 575 - 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 568 - 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 569 - 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 568 - 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.
Page 574 - 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.