Methods and aids in geography, for the use of teachers and normal schools . fconvenient, although not necessary if room is pretty dark),and a small hand-globe. Show that only one-half is illumined at one time. Then,by rotation, show that every part may become illuminedalternately. Place the lamp on the eastern side of the room,and let it represent the rising sun. Ask the children tothink of the sun as standing still, just as the lamp is,and the earth turning as the globe is turned. Fasten asmall piece of paper on the globe to represent where youlive, and place or hold the globe so the north po
Methods and aids in geography, for the use of teachers and normal schools . fconvenient, although not necessary if room is pretty dark),and a small hand-globe. Show that only one-half is illumined at one time. Then,by rotation, show that every part may become illuminedalternately. Place the lamp on the eastern side of the room,and let it represent the rising sun. Ask the children tothink of the sun as standing still, just as the lamp is,and the earth turning as the globe is turned. Fasten asmall piece of paper on the globe to represent where youlive, and place or hold the globe so the north pole willpoint towards the north, and then turn from west to east. RAYS OF LIGHT 399 The children will be able to see the white paper pass intothe light, — sunrise; come directly before the lamp, —noon; and pass into the dark half, — sunset. Draw on the board a circle to represent the earth, with aradius of twelve inches or more. Outside of this drawa larger circle, with a radius three inches longer, to repre-<,ent the atmosphere about the earth. Let a wide black-. Fig. 65. —Diagram sbowiag the Difference between Perpen-dicular and Sloping Rays of Light and Heat. board ruler represent rays of light, or, better, a solid this on the board above the circles, to representvertical rays, and draw the lines Ai and B2, Fig. 65. Then incline the ruler at various angles, and draw suchlines as A3, C5, and A4, D6. Then show the childrenthat the distance AD is almost twice AB; hence the slopingrays cover much more ground, and are not so hot in conse-quence. Then the sloping rays near morning and sunset 400 METHODS AND AIDS IN GEOGRAPHY pass through more masses of air, and consequently lose apart of the heating and lighting power. The effect of the difference in the heating-power ofperpendicular and oblique rays is shown whenever personstravel north from the south. As the person travels farthernorth, the sun seems to travel farther south; and theobliquity of his rays in
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Keywords: ., bookcentury1800, bookdecade18, booksubjectgeography, bookyear1895
