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The Ruler and Linear Measurement
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abacist abacus angle mirror answer beads board feet brace Bureau of Publications cent of error CF and DF circle common logarithms construction cube root decimal point diameter distance divisions divisor draw edge equal EXAMPLE EXERCISE Figure find the cube find the length five Ginn and Company given line height History of Mathematics horizontal hypotenuse inches intersection Japanese Mathematics left index logarithm main scale mantissa marked method move the hairline multiplicand multiply object octagon opposite outer graduation pantograph parallel rulers parallelogram Plane Geometry polygon possible error principle proportional dividers protractor rafter ratio represents right angle right triangle scale of planes School Mathematics Schorling screw set the left sextant side significant digits Similarly sine single counters slide rule slider soroban square root Steel Square Subtract tangent Teachers College unit of measure unit reading vernier vernier scale World Book Company York zero