Elementary Science Lessons (Volume 1); Being a Systematic Course of Practical Object Lessons Illustrated by Simple Experiments - Tapa blanda
Sinopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900. Excerpt: ... LESSON XXXI. LIGHT AND SHADOW. OBJECTS REQUIRES--Burning candle in candlestick; sheet of clean glass; slate; tumbler of clean water; sheet of stout paper; glass lamp chimney. ANALYSIS OP LESSON. Necessity for light; common sources. Some bodies stop the light which falls on them. Exps.--Let children point out source and course of light forming bright patch on floor or wall. Hold slate to cause shadow; note that light still falls on slate. Name shadow, and explain cause. Exps.--Let light from window fall on child's face, then hold slate between. Let other children and then child himself describe effect. Repeat above experiments with light of candle falling on book and on child's face. Children state general meaning of term shadow. Do all bodies stop light in this way? Children give examples. Exps.--Repeat above experiments with sheet of glass in place of slate. Hold lamp glass over candle flame. Roll and hold paper tube similarly. Hold tumbler of water between light and sheet of white paper. Bodies which allow light to pass readily are called transparent. Our own shadows, when and where seen, and why position varies? Exps.--Carry candle round child and note position of shadow. Let child turn rov-nA in sunlight. NOTES. Subject of Lesson.--Having stated in a previous lesson that we can only see things in the light, we now proceed to consider some of the sources of light, and what occurs when the light falls on the bodies--how it passes almost unchanged through some, while others stop it and produce shadows. Question the children again about our power of seeing bodies, and let them state under what conditions the bodies cannot be seen, and give the reason. Let them also state where the light comes from at the time ol the lesson, and from what sources (e.g. bur...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900. Excerpt: ... LESSON XXXI. LIGHT AND SHADOW. OBJECTS REQUIRES--Burning candle in candlestick; sheet of clean glass; slate; tumbler of clean water; sheet of stout paper; glass lamp chimney. ANALYSIS OP LESSON. Necessity for light; common sources. Some bodies stop the light which falls on them. Exps.--Let children point out source and course of light forming bright patch on floor or wall. Hold slate to cause shadow; note that light still falls on slate. Name shadow, and explain cause. Exps.--Let light from window fall on child's face, then hold slate between. Let other children and then child himself describe effect. Repeat above experiments with light of candle falling on book and on child's face. Children state general meaning of term shadow. Do all bodies stop light in this way? Children give examples. Exps.--Repeat above experiments with sheet of glass in place of slate. Hold lamp glass over candle flame. Roll and hold paper tube similarly. Hold tumbler of water between light and sheet of white paper. Bodies which allow light to pass readily are called transparent. Our own shadows, when and where seen, and why position varies? Exps.--Carry candle round child and note position of shadow. Let child turn rov-nA in sunlight. NOTES. Subject of Lesson.--Having stated in a previous lesson that we can only see things in the light, we now proceed to consider some of the sources of light, and what occurs when the light falls on the bodies--how it passes almost unchanged through some, while others stop it and produce shadows. Question the children again about our power of seeing bodies, and let them state under what conditions the bodies cannot be seen, and give the reason. Let them also state where the light comes from at the time ol the lesson, and from what sources (e.g. bur...
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