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THE POPULAR SCIENCE MONTHLY.
household that desired is rarely above one horse, and generally under it. A more complicated machine can, moreover, be used with success in the workshop than in the household, as in the latter it would generally
Fig. 1.
be in the care of attendants but little, if any, skilled in the use of machinery. Certain general conditions are, however, common to all. The work for which it is needed is generally of an intermittent
