Practical Physics |
From inside the book
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Page 41
... altering the form of the formula to be employed . This is most frequently the case when any small correction to the value of one of the observed elements has to be introduced , as in the case , for instance , of an observed barometric ...
... altering the form of the formula to be employed . This is most frequently the case when any small correction to the value of one of the observed elements has to be introduced , as in the case , for instance , of an observed barometric ...
Page 76
... altering the focus of the microscopes ; if the scale when placed in position is not distinct , it can be raised and supported by wedges of wood of proper thickness . Determine as before the divisions on which the cross - wires are set ...
... altering the focus of the microscopes ; if the scale when placed in position is not distinct , it can be raised and supported by wedges of wood of proper thickness . Determine as before the divisions on which the cross - wires are set ...
Page 78
... altering the position of the microscope in the Ys , slide the stand A over the horizontal glass plate until the second mark is in focus , and read its position on the scale . The height of the axis of the microscope above the glass ...
... altering the position of the microscope in the Ys , slide the stand A over the horizontal glass plate until the second mark is in focus , and read its position on the scale . The height of the axis of the microscope above the glass ...
Page 100
... altering the relative position of the scale and pointer is by means of the levelling screws attached to the case . Levels should be placed in the case by the instrument - maker , which should shew level when the scale is in its proper ...
... altering the relative position of the scale and pointer is by means of the levelling screws attached to the case . Levels should be placed in the case by the instrument - maker , which should shew level when the scale is in its proper ...
Page 130
... altering its temperature . Replace the bottle on the scale pan , and weigh ; let the weight observed be 24'975 grammes . This weighing , like every other , should be done twice or three times , and the mean taken . This is the weight of ...
... altering its temperature . Replace the bottle on the scale pan , and weigh ; let the weight observed be 24'975 grammes . This weighing , like every other , should be done twice or three times , and the mean taken . This is the weight of ...
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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.