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The undertaker of some great manufactory, who employs a thousand

a-year in the maintenance of his machinery, if he can reduce this

expense to five hundred, will naturally employ the other five

hundred in purchasing an additional quantity of materials, to be

wrought up by an additional number of workmen. The quantity of

that work, therefore, which his machinery was useful only for

performing, will naturally be augmented, and with it all the

advantage and conveniency which the society can derive from that

work.