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Updated: June 20, 2025
The original mode in which the cylinders were made rendered it a matter of mechanical difficulty almost an impossibility in the machine shop to produce them exactly alike. To avoid this difficulty, Messrs. Dobson and Barlow have reconstructed the combing cylinder, and the parts being fitted together by simple turning or boring, accuracy and interchangeability can always be depended upon.
The union of gods with mortals, which forms the gist of Mythological tales, symbolizes the god-like and the mortal qualities inherent in human nature. Mortals raised to the abode of the gods; and the gods descended into mortal life; symbolize the interchangeability of what we term matter and spirit the power of transmutation of the lower into the higher life.
The meaning attached to the word "valency," is simply one of interchangeability, just as we say a penny is worth two halfpennies or four farthings. The question next arises, is the valency of an element fixed or variable? If the word be defined as above, it is absolutely certain that the valency varies.
The economy thus illustrated shows a certain disregard, of a not altogether agreeable chance of interchangeability, that might even be dangerous to health. On the other hand, it is a wise precaution that marks beer-glasses and beer-jugs with a line, to show just how much beer you are entitled to. This puts the foam-stealing vendor at your mercy.
He had established his shops at Whitneyville, near New Haven; and it was there that he worked out another achievement quite as important economically as the cotton gin, even though the immediate consequences were less spectacular: namely, the principle of standardization or interchangeability in manufacture. This principle is the very foundation today of all American large-scale production.
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