Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση

IMPROVEMENT TO

PALMER'S ENDLESS SELF-COMPUTING

SCALE AND KEY;

ADAPTING IT TO THE DIFFERENT PROFESSIONS, WITH EXAMI LES
AND ILLUSTRATIONS FOR EACH PROFESSION; AND ALSO

TO COLLEGES, ACADEMIES AND SCHOOLS, WITH A

[blocks in formation]

KC1277

UNIVERSITY
LIBRARY

48*130

NORTHERN DISTRICT OF NEW YORK, TO WIT: Be IT REMEMBERED, That on the eleventh day of December, Anno Domini, 1843, JOHN CUTTS SMITH, of the said District, has deposited in this Office the title of a Book, the title of which is in the words follow. ing, lo wit:

A Key to the Endless, Self-computing Scaie, showing its Application 10 the different Rules of Arithmetic, &c. By AARON PALMER."

The right whereof he claims as proprietor. In conformity with an Act of Congress entitled An Act w'amend the several Acts respecting Copy Rights. (A true copy of record.

ANSON LITTLE, Clerk of the District.

STEREOTYPED BY
GEORGE A. CURTIS,
NEW ENGLAND TYPE AND STEREOTYPE FOUNDRY,

BOSTON

PA L M E R's

ENDLESS SELF-COMPUTING SCALE.

The proprietors of this invaluable work, beg leave to present the public with the following notice.

This Scale (the result of three years' incessant labor) is designed as an assistant in all arithmetical calculations. The simplicity, rapidity, and accuracy of its results, have as. tonished our best mathematicians. It consists of a logarithmic combination of numbers, arranged in two or more circles, one of which is made to revolve within the other ; which process constantly changes the relation of the figures to each other, and solves an infinite variety of problems. Its advantages are, — 1st. A complete saving of mental labor ; for, by the use of this

Scale, the most intricate calculations are but a

pleasurable exercise of the mind. 2d. A great saving of time. Computations requiring from

three to four days, are wrought out by this Scale in

the incredible short space of one minute. 3d. Complete accuracy. The results of the computations on

this Scale, are infallible. Errors are entirely out of

the question, except through sheer carelessness. 4th. Mental improvement. By this Scale, a knowledge of the

philosophy of numbers, and their relation to each other, is soon obtained. So that, in a little time, many of the common calculations are wrought out by the mere exercise of the mind.

« ΠροηγούμενηΣυνέχεια »