Notes of lessons on the Herbartian method (based on Herbart's plan) . sof where the inclined plane is used to raise weights im-possible otherwise. Deduce from their own experience theadvantage of it, and how it is increased according to theincline. Ask if principle of work being the same applieshere, and why ? Show a screw and ask which of the threemechanical powers acts in it. Recapitulate the matter briefly,and ask pupils how they would apply their knowledge prac-tically to the instances mentioned in application. 19- Notes on Herbartian Method LESSON ON THE PRINCIPLE OFARCHIMEDES. Class—Age,
Notes of lessons on the Herbartian method (based on Herbart's plan) . sof where the inclined plane is used to raise weights im-possible otherwise. Deduce from their own experience theadvantage of it, and how it is increased according to theincline. Ask if principle of work being the same applieshere, and why ? Show a screw and ask which of the threemechanical powers acts in it. Recapitulate the matter briefly,and ask pupils how they would apply their knowledge prac-tically to the instances mentioned in application. 19- Notes on Herbartian Method LESSON ON THE PRINCIPLE OFARCHIMEDES. Class—Age, 15 to 17. Time—-Forty minutes. Previous Knowledge—Laws of pressure of fluids. Aim—To exercise the reasoning powersof the pupils in teaching them the principle and leading them to deduceits application to floating bodies. MATTER. I. Preparation. Story of Archimedes and Hiero of Syracuse very brieflytold. II. Presentation. f{a) Weigh two cylindersout of water. (b) Immerse solid in waterand weigh the twocylinders. {c) Lastly, fill hollow cylin-der with Hydrostatic Balance. Results noticed. fi. After (b) found lighter. 12. After (c) weight same as :—Apparent loss of weight after (b). i = weight of equal volume of water to loss ^ = weight of water displaced. Principle stated : A solid immersed in a fluid loses as muchof its weight as is equal to the weight of the fluid of the Principle :— ABCD = body in all pressures areequal. But side pressures are equalto opposite, therefore counter-balance. Downward pressure = columnof water AN N B + weight of body. N N — \- —1 — A-i p — —c Iq- The Principle of Archimedes 193 Upward pressure = column of water CNND. Therefore ANNB + weight = column of water CNND. Take away column ANNB from each and weight =column of water CABD. Take away column ANNB from each and weight =column of water equal to weight of water displaced. III. Association. 1. Draw fr
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