Log log duplex vector (Explored)

The slide rule was developed in the 17th century, but its modern version dates from the mid-1800's. It was eventually displaced by the pocket calculator starting in the late 1960's. However, it was still used on Apollo missions in the 1970's.

Using the various scales on both sides, one could solve problems involving multiplication, division, square and cube roots, plane and hyperbolic trigonometry, logarithms, and numbers raised to a power.

This particular slide rule, the Keuffel & Esser log log duplex vector, came with a 132 page manual (http://www.mccoys-kecatalogs.com/KEManuals/4081-3_1955/4081-3_1955.pdf) and a 49 page supplemental manual www.mccoys-kecatalogs.com/KEManuals/4083-3/4083manual.pdf. If you think that camera manuals are difficult to read, try a slide rule manual.

The Sunday Challenge: Numbers

AIMG 4523

, Jan Klimczak, , Rafael and 33 other people have particularly liked this photo

34 comments - The latest ones

J.Garcia ^club

Interesting idea and beautiful image

9 years ago.

Stormlizard ^club

Seeing this takes me back a piece. I do still have the one I used during my studies in a beautiful Leather case.
I agree about the User instructions.

LOL

9 years ago.

Helena Ferreira

ઇઉ.¸¸.* ઇઉ.¸¸.*
ઇઉ.¸¸.* ઇઉ.¸¸.*Amazing composition!!

9 years ago.

Pam J ^club

Still scares the heck out of me !

9 years ago.

William Sutherland ^club

Outstanding capture!

Admired in:
www.ipernity.com/group/tolerance

9 years ago.

Sami Serola (inactiv… ^club

Good old slide rule! =) No batteries needed =D

9 years ago.

Valfal

It's been many years since I saw a slide rule; excellent subject for the challenge!

9 years ago.

PaulOClassic©

Great shot - I remember so clearly, sitting in my Maths class at school, feeling the sense of elation when I finally worked out how to use my slide ruler!

I wonder how many of the Tech kids that we now teach, would find this easy to use?

9 years ago.

Shuttering Yukon

172 page manual... sheesh not this chick! I can't even pronounce the name of the ruler, let alone use it! that's pretty insane! And Esther sine this is all about photography, you did a smashing job! And you exceeded the amount of numbers required this week.

9 years ago.

Gillian Everett ^club

Smart idea, plenty of numbers here. Excellent capture and information.

9 years ago.

Wierd Folkersma ^club

Memories from long ago :D

9 years ago.

H C

Great shot with lots of numbers. I remember using a slide rule many years ago, but have forgotten how it works.

9 years ago.

Amazingstoker

beautifully taken photo, and great idea for numbers. I used to use a slide rule and still have my prized, and if I recall correctly, very expensive duplex log-log, somewhere, along with my copy of "Teach Yourself the Slide Rule" by the amazingly and unforgettably named "Burns Snodgrass"

9 years ago. Edited 9 years ago.

autofantasia ^club

Great close-up shot of a very interesting piece of equipment, but I'd have no idea how to use it whatsoever! :(

9 years ago.

Jan

eeeeks. Frightening. far too many numbers and reminds me of school. Get it outta here:)

9 years ago.

Christiane ♥.•*¨`*•✿

Very interesting !
... I am so bad in mathematical ! (:o(((((

9 years ago.

Malik Raoulda ^club

It reminds me of class benches and during math ..!
In his time the class teacher was such a rule,
but larger and frightened us with pretending to hit us.

9 years ago.

cammino ^club

Ich habe so ein Ding auch noch zuhause (und kann damit noch rechnen). Klasse Bild.

9 years ago. Edited 9 years ago.

Clickity Click

What a great shot for the challenge .... like the angle of the slide rule and the colors all work well together. Sure glad I didn't have to try to learn to use one of these ... :)

9 years ago.

Indycaver (Norm) ^club

Cool idea and photo Esther! I've got one here someplace.

9 years ago.

Karen's Place ^club

Very, nice clear photo Esther. Like anything, it makes sense when you know how to use it. I've never seen one before, but still have my little calculator from the 1960s. Thanks for the info. :)

9 years ago.

Philippe_28

Un très intéressant souvenir d'un passé pas si lointain

9 years ago.

Esther ^club

Thank you all for your visits and comments.

9 years ago.

RHH

I still have my old slide rule and still know how to use it! Great shot.

9 years ago.

Fantasyfan

I remember we had one like that lying about

9 years ago.

LutzP ^club

I still have my old one as well, looks almost the same, is however an Aristo Studio. Great memories!

9 years ago.

Esther ^club

Thanks for visiting.

9 years ago.

Esther ^club

I used one in high school and then got a calculator.

9 years ago.

Phill G

Lol. A headache from school...the old log tables too (my most hated book). When we were allowed to use calculators, it was like JC had risen again. A cool blast from the past so well presented.

9 years ago.

Esther ^club

Thanks, Phil and Chris.

9 years ago.

Esther ^club

Merci, Thethi.

9 years ago.

Esther ^club

Me too.

9 years ago.

Jan Klimczak

Wspomnienia! Kiedyś liczyłem z jego pomocą i bez zasilania zawsze gotowy do pracy. Jan

9 years ago.

Esther ^club

I used one too.

9 years ago.

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