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accuracy adding and subtracting angle whose sine anti-log anti-logarithm base Bring the cursor complementary angle Conversion Factor correct to four cosec decimal fractions decimal notation decimal point distance division engraved explained in Section expressed Find the angle find the value following examples formulae four figures gauge mark graph hair-line read Hence Horse-power illustrated length representing log less logarithms of numbers mantissa method of finding metres Miles per hour move the slide multiplying and dividing number of figures obtained quotient red extension Result Reverse the slide right-angled triangle rulers scale read Section 20 Section 28 Sine Rule slide protrudes Slide Rule slide the cursor square root Step 1 Bring Step 1 Mark Step 1 Note Step 2 Evaluate Step 2 Find system of units tables of logarithms tables on pages tangents of angles three figures trigonometrical ratios velocity vulgar fractions Watt-hours Young's Modulus