Mowry, W. A. and Mowry, A. M., Inventions and Inventors.
Parton, J., Captains of Industry (two series).
Rocheleau, W. F., Products of the Soil; Minerals; Manufactures.
Towle, G. M., Heroes and Martyrs of Invention.
Williams, A., How it is Made.
Exercise 258
Study the punctuation of the following; then write from dictation:
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It is stated that practical experience with gas mantles made of artificial silk—that is, silk made from wood pulp—has proved them to be far superior to those made of cotton, especially where the mantles are exposed to excessive vibration. Several German towns are said to be obtaining exceptionally good results from these new mantles used in conjunction with pressure gas, and it is asserted that the mantles are in good condition after being used for seven or eight weeks. Artificial silk, according to reports, has also been used experimentally by several manufacturers of incandescent gas mantles in the United Kingdom. The reports are all very encouraging, except that there seems to be one difficulty that is purely mechanical—the knitting of the artificial silk. The knots and other imperfections in the yarn cause a considerable amount of waste. However, the knitting-machine makers are experimenting to overcome it.—Daily Consular and Trade Report.
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