..............................................
The Slide Rule
The slide
rule, also known colloquially in the United States as a slipstick,
is a mechanical analog computer.
The slide rule is used
primarily for multiplication and division, and also for functions such as exponents,
roots, logarithms and trigonomentry, but typically not for addition or
subtraction.
Though
similar in name and appearance to a standard ruler, the slide rule is not meant
to be used for measuring length or drawing straight lines.
Slide
rules exist in a diverse range of styles and generally appear in a linear or
circular form with a standardized set of markings (scales) essential to
performing mathematical computations.
Slide
rules manufactured for specialized fields such as aviation or finance typically
feature additional scales that aid in calculations common to those fields.
At
its simplest, each number to be multiplied is represented by a length on a
sliding ruler.
As
the rulers each have a logarithmic scale, it is possible to align them to read
the sum of the logarithms, and hence calculate the product of the two numbers.
The
Reverend William Oughtred and others developed the slide rule in the 17th century
based on the emerging work on logarithms by John Napier.
Before
the advent of the elecronic calculator, it was the most commonly used calculation tool in
science and engineering.
The
use of slide rules continued to grow through the 1950’s and 1960’s even as
computers were being gradually introduced; but around 1974 the handheld
electronic scientific calculator made them largely obsolete and most
suppliers left the business.
From Wikipedia, the
free encyclopedia
Hemmi
Bamboo Slide Rule Company
Bamboo Slide Rule Company Ltd. in Japan is
the oldest and most well known Japanese manufacturing company making slide
rules.
Jirou Hemmi and Company was founded in 1895 and,
in 1912, was granted by the Japanese Patent Office Patent No. 22129 for their
laminated bamboo construction method for slide rules.
As a young company wanting exposure to a larger
market, they started by selling distribution licenses to three other companies:
the Fredrick Post Company of Chicago, Illinois, the Hughes-Owen Company of
Canada and Tamaya & Company of Tokyo, Japan.
Tamaya, an already a well-established and
well-known firm in Japan, began selling Hemmi Slide Rules in 1913.
The Hughes-Owen Company of Canada (another old
firm), began selling the Hemmi Slide Rules in Canada in 1914 and in 1931, the
Fredrick Post Company, of Chicago, Illinois, began selling them in the United
States.
All of three of these companies were selling
Hemmi-manufactured Slide Rules under their own and Hemmi's name.
Sun Hemmi also supplied re-branded OEM slide
rules to other North American companies like Lafayette, Lietz, and Geotec.
Early examples may have had the "Made in
Japan" or "Made in Occupied Japan" sanded off due to
anti-Japanese sentiments after WWII.
It is estimated that Hemmi produced about 15
million slide rules altogether.
How to use a
sliderule
Dave Grout of
Delano, MN., is a vanishing breed. He doesn't own a computer, but he has plenty
of sliderules.
You might also like:.
The Abacus
And Ancient Chinese Numbering System
CLICK
HERE . . .
...............
CLICK
HERE . . .
.............................
..............
How Math Works
CLICK
HERE . . .
.............................
Calculus
CLICK
HERE . . .
.............................
The Most Efficient Way To Do The Math
CLICK
HERE . . .
'
No comments:
Post a Comment