Machines at Work
by Mary Elting
Publisher: Harvey House 1962
Number of pages: 100
People have always been able to work and build wonderful things, using just their muscles. And they can do a very great deal more when they use their brains, too. They can invent machines to make work thousands of times easier and faster.
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by Bertha Morris Parker - Row, Peterson and company
Studying the distant suns is a great strain on the imagination. If you are to get a true picture of the stars, you will have to imagine temperatures so high that the temperature in the center of a furnace fire would be cool beside them.
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To place before the youthful student a compact and concise compendium of the leading and most universally important branches of Science has been my principal object in the preparation of this little volume. Fanciful sketches illustrate these pages.
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