Our Physical World a Source book of Physical Nature Study
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In our eReader you can find the full English version of the book. Read Our Physical World a Source book of Physical Nature Study 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 Our Physical World a Source book of Physical Nature Study
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That was so very long ago we do not know what his methods were. But following the man of the chipped-stone age and of the polished-stone age, there came peoples who made bronze utensils, and that time is known as the Bronze Age. Bronze is made by melting together tin and copper. So those people must have know how to extract tin from its ores. We know the tin mines of Cornwall, England, were worked during Roman times and probably very much earlier.
Then came the age of iron implements. Some sava...ge tribes have today very crude processes for extracting iron from its ore.
FIRE AND ITS USES 159 Possibly the process was discovered when some savage used an easily reduced ore of iron like siderite (see p. 50) to build a fire- place, and found after many fires a bit of iron in it that could be hammered out into serviceable shape. At any rate, the iron forge among some African and Asiatic tribes is today simply a hole dug in a high clay bank to serve as a fireplace in which a charcoal fire is built and bits of iron ore and limestone are added, then more charcoal, limestone, and iron ore, layer after layer.
What to read after Our Physical World a Source book of Physical Nature Study?
You can find similar books in the "Read Also" column, or choose other free books by Elliot Rowland Downing to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
That was so very long ago we do not know what his methods were. But following the man of the chipped-stone age and of the polished-stone age, there came peoples who made bronze utensils, and that time is known as the Bronze Age. Bronze is made by melting together tin and copper. So those people must have know how to extract tin from its ores. We know the tin mines of Cornwall, England, were worked during Roman times and probably very much earlier.
Then came the age of iron implements. Some sava...ge tribes have today very crude processes for extracting iron from its ore.
FIRE AND ITS USES 159 Possibly the process was discovered when some savage used an easily reduced ore of iron like siderite (see p. 50) to build a fire- place, and found after many fires a bit of iron in it that could be hammered out into serviceable shape. At any rate, the iron forge among some African and Asiatic tribes is today simply a hole dug in a high clay bank to serve as a fireplace in which a charcoal fire is built and bits of iron ore and limestone are added, then more charcoal, limestone, and iron ore, layer after layer.
What to read after Our Physical World a Source book of Physical Nature Study?
You can find similar books in the "Read Also" column, or choose other free books by Elliot Rowland Downing to read onlineMoreLess
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