the smaller the parts will be, and in inverse proportions ; family, designed to facilitate the acquirement of the relation tised tn Europe. thus, that with equal numerators, those fractions are the of numbers and the knowledge of the elements of a lan- The material generally employed in European… … are detached again after cooling. In casting a larger and Fig. 1 shows what the inventor calls an " alphabeticon." ercises in them will be very easy. more complicated model, we have to examine beforehand It is a frame supported on standards, the frame being com- Mental arithmetic can be readily…
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