Nature Study for Grammar Grades: a Manual for Teachers And Pupils Below the High School in the ...
Nature Study for Grammar Grades: a Manual for Teachers And Pupils Below the High School in the ...
Wilbur S Wilbur Samuel Jackman
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18. What properties should be combined in wood used for floors? For doors? For window sashes? For weather boarding? What prop- erties combined in "British Oak" have made England's navy famous? What properties make oak suitable for spokes in wheels? 19. In what position in joists are knots most injurious? The least injurious? Give a reason for both. 20. To support a given weight, which would be the more expensive for joists, oak or pine? Pine or hemlock? E. What are some of the constituents of w...ood? Experiments: Perform the necessary exper- imental work in this connection in accordance with the general suggestions found in Chapter VIII, page 76, et seq. 21. What is the ratio of the weight of the ash to the weight of the dry wood in the speci- mens used in the foregoing problems? 22. What is the ratio of ash, by weight, be- tween the same weights of different kinds of wood? 286 NATURE STUDY FOR 23. Does the relative weight of the ash seem to depend upon the relative weight of the wood? That is, do the heavier woods have more or less ash than the same weight of the lighter woods?
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