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### Contenido

 INTRODUCTORY 1 WEIGHTS AND MEASURES 24 ANGLES AND CIRCULAR FUNCTIONS 37 SIGNIFICANT FIGURES 52 LOGARITHMS 71 THE SLIDE RULE 90 GRAPHIC REPRESENTATION 102 CURVES AND EQUATIONS 115
 ACCURACY 170 THE PRINCIPLE OF COINCIDENCE 180 MEASUREMENTS AND ERRORS 188 STATISTICAL METHODS 197 DEVIATION AND DISPERSION 211 THE WEIGHTING OF OBSERVATIONS 223 LEAST SQUARES 240 INDIRECT MEASUREMENTS 255

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Página 6 - In any proportion, the product of the means is equal to the product of the extremes.
Página 36 - specific gravity" of a substance is defined as the ratio of the...
Página 251 - ... n'y —p', &c., in which x and y denote the final corrections to be applied to the two assumed quantities respectively. The combination of these equations which gives the most probable values of the unknown quantities, is effected according to the method of least squares. Thus, we multiply each equation by the coefficient of x in that equation, and the sum of all the equations thus formed gives the first normal equation. Then we multiply each equation of condition by the coefficient of y in that...
Página 26 - The international standard of length is a bar of a platinum-iridium alloy called the standard meter, which is kept at the International Bureau of Weights and Measures near Paris, France.
Página 68 - ... superfluous figures if the larger factor is used as the multiplier, but will give as many as the larger factor contains if that is used as the multiplicand. Of course the best method is to round off the larger factor before multiplying, so that it has no more figures than the smaller one. Standard Form.
Página 192 - ... instructors, or else the grades given by all instructors must be stated in terms of the same average and same dispersion. Otherwise, the taking of an average is not allowable, and the grade criterion instantly loses one of its greatest advantages. Finally, grades as measures of ability are subject to both accidental and constant errors. The difference between constant errors and accidental errors must be carefully noted, for it will play a very important part in discussions to follow.8 An accidental...
Página 150 - Galileo's suppositions that small vibrations of the pendulum are isochronous, and that the space traversed by a falling body is proportional to the square of the time it has been falling.
Página 5 - ... watch their participation and thus time his delivery. Listeners are frequently asked to repeat pronunciations of words, to answer questions, or to draw pictures; consequently the radio teacher must learn to give adequate opportunity for this participation. It is also wise to repeat essential material, but this should be done in such a way as not to bore the listener. Music Instruction Since Dr. Joseph E. Maddy...
Página 95 - Division.@Set the divisor on B under the dividend on A, and read the quotient on A over the index of B; or set...
Página 41 - ... is of essential consequence. PROBLEM II. Through a given point to draw a line which shall make a given angle with a given line. Let S, figs.