Otis King calculator - GIF

[ToolTalkBot]

Otis King calculator.




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

[Frank S]

A cylindrical slap stick

[BuffaloJohn]

A cylindrical slap stick

As soon as I saw it, I knew what it was. Multiplication and Division are just adding and subtracting logarithms...

[neilbourjaily]

Slapstick = slipstick? I've often wondered how many preppers have a slipstick.

[BuffaloJohn]

I've often wondered how many preppers have a slipstick.

Here are mine:

[mklotz]

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.

[Duke_of_URL]

Don’t forget to manage your exponents!

[Frank S]

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.

[BuffaloJohn]

Don’t forget to manage your exponents!

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.

[neilbourjaily]

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.

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?