Notes of lessons on the Herbartian method (based on Herbart's plan) . ires and stoves. • pies to prove ,,. c L ..„ r, T_ . { 3. Mixing 01 water at different tempera- that Heat is)3 . to v r j 7 tures. transferable. ^, . , . , . J 14. 1 hings dried in sun. The Propagation of Heat 165 1. By Conduction, II. Presentation. Heat transmitted in three ways. r(a) Transfer from particle to particlethrough mass of substance in direc-tion of decrease of temperature. y(b) In solids. Example : Poker in the fire. Good Conductors.—Metals; less good—marble, slate,glass. Bad Conductors.—Organic substances, bric
Notes of lessons on the Herbartian method (based on Herbart's plan) . ires and stoves. • pies to prove ,,. c L ..„ r, T_ . { 3. Mixing 01 water at different tempera- that Heat is)3 . to v r j 7 tures. transferable. ^, . , . , . J 14. 1 hings dried in sun. The Propagation of Heat 165 1. By Conduction, II. Presentation. Heat transmitted in three ways. r(a) Transfer from particle to particlethrough mass of substance in direc-tion of decrease of temperature. y(b) In solids. Example : Poker in the fire. Good Conductors.—Metals; less good—marble, slate,glass. Bad Conductors.—Organic substances, brick. 1. How objects feel to the touch. 2. Woollen material to keep in heat. 3. Copper ball wrapped in handkerchiefand held over burner. 4. Differences proved by bars of differentmetals in fire. Proofs. 5 J (a) Transmitted by mo-tion of heated par-ticles from one pointof body to (6) In fluids. / i. Boiling water andwinds. •ii. Draughts, ventila-tion,iii. Trade winds, land and sea breezes. iv. System of heating by hot-water pipes. 3. By Radiation. Convection Currents used duringthe Heating of Water. (a) Transmitted from one body to another through an intervening medium,without affecting the temperatureof medium. (b) Fire and sun give heat in this way. 66 Notes on Herbartian Method ( i. Thermometer in vessel exhausted of J air, affects sides, j ii. Something held in front of fire. Viii. Stoves ; hot-water Dines. Examples,III. Application, Example of Work-ing of Hot-water Pipes. hot-water pipes. i. Heat passes from furnace to waterthrough boiler by conduction. 2. Passes through water by convection. 3. From water through pipes to air by conduction. 4. Air to person, convection. 5. Pipes also radiate heat. PROCEDURE. I. Question class on familiar examples, as heating waterin a kettle, a room by a fire, and mixing water at differenttemperatures, and make them deduce that heat is happens when a hot body is put in contact with a coldone ? Refer to wh
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