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THIS FINE SLIDE RULE sent to you FREE
EASY TO USE

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Titolo: THIS FINE SLIDE RULE sent to you FREE

Dimensione file: 1,2 MB (2591x1867 pixel)

Tipo del contenuto: pagina di rivista o giornale

Fonte pubblicazione: Popular Mechanics

Data della fonte: 1939-11

Linguaggio: en (English)

Marca del contenuto: D. Van Nostrand Company  

Caricato da: Maverich il 30-05-2020
Testo originale: THIS FINE SLIDE RULE sent to you FREE
EASY TO USE Saves time and mental effort in solving mathematical problems.
Full Size 1O inches long. Directions for using

ACCURATE — NICELY FINISHED
THREE complete books by three mathematical authorities have gone into the making of this one fascinating and enlightening volume of 602 pages. No one who uses mathematics in his daily work—or even occasionally—should be without it. "Speed and Fun with Figures" is, we believe, the finest popular treatment of Mathematics ever published. It is full of practical rapid methods and short-cuts for the technical worker, student, and teacher. By amusing tricks, puzzles and problems it holds the attention of the layman, too, and helps him to fill in the gaps in his mathematical education. Sent on free approval, with Slide Rule included free!

Hundreds of Mathematical Short-Cuts "Lightning Calculators" Secrets Revealed
Why waste time with roundabout laborious methods of calculation? Why scrawl endless figures on paper to get the answer, and then not be sure you are right? Learn the shortcuts! Make Mathematics exhilarating, practical, useful in your daily work! Part 1 of this great book gives the proved methods used by lightning calculators to solve difficult problems instantly.

Marvelous Aid of Slide Rule Made Clear
Multiplication and division are no trick at all, complicated roots and powers, trigonometric and reciprocal functions are easy—with the slide rule. Part 2 of this book shows you how simple it all is.

Mathematics As Recreation—Puzzles, Tricks, Etc.
"The Moon Hoax," the "School Girl Problem", "Cattle Problem of Archimedes" and hundreds of other mathematical tricks given in Part 3 afford endless amusement and education, too.

3 GREAT BOOKS now in ONE Volume!

RAPID ARITHMETIC
By T. o'Conor Sloane, Ph.D., LL.D.
Author of "Arithmetic of Electricity”
•Notations and Signs
•Addition
•Subtraction
•Multiplication
•Division
•Fractions
•The Decimal Point
•Interest and Discount
•Percentage Calculations
•Powers of Numbers
•Exponents
•Squaring the Circle
•Curious Multiplication and Division
•Paradoxes and Mysteries
•Short - Cuts
•Etc., etc.

A MANUAL of the SLIDE RULE
By J. E. Thompson, B.S. in E.E., A.M.
Department of Mathematics, Pratt Institute, Brooklyn.
History and Development of the Slide Rule
• Theory and Operation of the Mannheim Slide Rule, including modified forms of this rule, in Multiplication, Division, Reciprocals, Decimals, Combined Multiplication and Division, Proportion, Squares, Cubes and Roots
• Typical Problems and Slide Rule Settings
• Etc.. etc.

RECREATIONS in MATHEMATICS
By H. E. Lieks
• Arithmetic
• Algebra
• Geometry
• Trigonometry
• Analytic Geometry
• Calculus
• Astronomy and the Calendar
• Mechanics and Physics
• Amusing Tricks, Puzzles, and Mysteries of Mathematics.

—and hundreds more subjects as fascinating

THIS SPECIAL OFFER

With this great new book "SPEED AND FUN WITH FIGURES"

at last PRACTICAL MATHEMATICS made EASY
NEVER before—and probably never again—a fine, full-size slide rule free! Genuine Mannheim type in nicely finished wood with calibrations in contrasting black on white, accurate indicator with reading lens that magnifies. Has A, B, C, D, K, S, T, and L scales as on expensive slide rules costing $1.00 or more, and in addition, an inch scale, millimeter scale and table of equivalents. This valuable slide rule, with directions for use, is yours free if you accept our offer on this marvelous new book, "Speed and Fun with Figures", that makes practical mathematics positively easy and entertaining.

EXAMINE BOOK FREE
Slide Rule Included If You Act Promptly
"Speed and Fun with Figures" combines three books that sold for $4.75 into one volume for only $3.50. Send no money. Examine the book 5 days FREE. Then return it or send $1.50 and $1.00 a month for two months ($3.50 in all). Slide rule included free if you act at once!

Tag: d. van nostrand company, regolo calcolatore