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Otis King calculator.
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Previously:
1950s Curta Type II mechanical calculator - GIF
Addifix pocket mechanical calculator - video
Cigarette pack calculator - photo
Friden EC-130 electronic calculator - photo
Glock calculator - photo
A cylindrical slap stick
As soon as I saw it, I knew what it was. Multiplication and Division are just adding and subtracting logarithms...Quote:
Originally Posted by Frank S
Slapstick = slipstick? I've often wondered how many preppers have a slipstick.
Here are mine:Quote:
Originally Posted by neilbourjaily
Attachment 50300
Sliderules have scales that are calibrated 1 to 1(0), i.e, a decade spaced on the logarithms of a decade (hard to express that in print). With that arrangement it's possible to multiply/divide ANY two numbers.
This gadget has scales calibrated with actual numbers, e.g. 588, something that would never be found on a sliderule. This implies that there is a limit on the largest number it can handle.
Note that he keeps referring to it as a "calculator" (which it is), not as a "slide rule".
He shows it can multiply/divide but never mentions whether it can do addition/subtraction which, of course, electronic calculators can do.
So, I think it's a kind of fixed range mul/div calculator, which could be useful if your calculations were confined to a fixed range, a situation that might exist in certain business types.
Nevertheless, it would be handy as a weapon if you worked in a shady business.
Don’t forget to manage your exponents! :)
OR you could always reffer to the fog eared pages of your Smoley's book of tables; parallel tables of logarithms and squares, angles and logarithmic functions, corresponding to given bevels, and other tables.
That is why - even now - I write out the expression with units and make sure all the conversions between units are represented. I even do that when I make calculations in excel.Quote:
Originally Posted by Duke_of_URL
I can only manage an expression or a calculation or an equation if I write it out. I don't trust the work of another who doesn't write them out. How does one know?Quote:
Originally Posted by BuffaloJohn
