Thus it comes about that the temperature is regulated primarily by adjusting the quantity of silicon in the pig iron treated, of this element usually sufficing.
Thus it comes about that rolling is so very much cheaper than either forging or drawing that these latter processes are used only when rolling is impracticable.
Russia's most valuable ore deposit is the very large and easily mined one of Krivoi Rog in the south, from which comes about half of the Russian iron ore.
Thus it comes about that the largest use of cement is for manufacturing concrete for dock and harbour work, and for the making of foundations.
Thus it comes about that the observer, the computer, and the mathematician have in astronomical science a practically unlimited field for the exercise of their powers.
