Common Things And Elementary Science in the Form of Object Lessons
Common Things And Elementary Science in the Form of Object Lessons
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In our eReader you can find the full English version of the book. Read Common Things And Elementary Science in the Form of Object Lessons Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Common Things And Elementary Science in the Form of Object Lessons
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Lead the children to see that there seems no limit to the degree of divisibility. Take a lump of coloured matter say common stone- blue. Pound it. Each particle has extension although its exact size cannot be ascertained by ordinary measurement.
2. Take a grain weight of this powder, place it in a pound of water. Stir it up the whole is coloured. Now, as the colour is 318 ELEMENTS OF SCIENCE IN OBJECT LESSONS.
due to the presence of the stone -blue there must be some of its particles in every p...ortion of the water.
In a pound of water there are 5760 grains. Now, as the one grain of stone-blue put into the water has coloured the whole, every grain weight of water must have its share of the whole, and this share is gJg^yth of a grain. Tell the children that the colour of our blood is due to the presence of red flattened globules floating in a colourless liquid. "When viewed under a microscope these globules can be seen and measured, and it has thus been ascertained that one of these globules is less then g-g^th of an inch in diameter, and a drop of blood, which might be suspended from the point of a needle, would contain about one million of globules.
What to read after Common Things And Elementary Science in the Form of Object Lessons?
You can find similar books in the "Read Also" column, or choose other free books by Joseph Hassell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Lead the children to see that there seems no limit to the degree of divisibility. Take a lump of coloured matter say common stone- blue. Pound it. Each particle has extension although its exact size cannot be ascertained by ordinary measurement.
2. Take a grain weight of this powder, place it in a pound of water. Stir it up the whole is coloured. Now, as the colour is 318 ELEMENTS OF SCIENCE IN OBJECT LESSONS.
due to the presence of the stone -blue there must be some of its particles in every p...ortion of the water.
In a pound of water there are 5760 grains. Now, as the one grain of stone-blue put into the water has coloured the whole, every grain weight of water must have its share of the whole, and this share is gJg^yth of a grain. Tell the children that the colour of our blood is due to the presence of red flattened globules floating in a colourless liquid. "When viewed under a microscope these globules can be seen and measured, and it has thus been ascertained that one of these globules is less then g-g^th of an inch in diameter, and a drop of blood, which might be suspended from the point of a needle, would contain about one million of globules.
What to read after Common Things And Elementary Science in the Form of Object Lessons?
You can find similar books in the "Read Also" column, or choose other free books by Joseph Hassell to read onlineMoreLess
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