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Produx telmachientje / calculator - Aristo mini rekenlat / slide rule

Produx estimate 1935 - 1955 and Aristo 50's

Micro Nikkor 60mm 1:2.8 G


Gloucester, a Bottled Spider, Claudionimuc, tiabunna, yokopakumayoko Francesco and 2 other people have particularly liked this photo

10 comments - The latest ones
They work even without electricity.
4 years ago.
François Labarbe has replied to Tomacek
All set for the future ;-)
4 years ago.
David Sidwell
David Sidwell
I remember using a sliderule at school as pocket calculators were only just becoming available and we weren't allowed to use them. I wouldn't have a clue how to use a sliderule today though.
4 years ago.
François Labarbe has replied to David Sidwell
During my technical training in the 60's there weren't pocket calculators so we poor fellows had to "slide" the whole day. I used a 30cm wooden Castell with a plastic cursor, my father in the 20's a Nestler with an aluminium cursor.
This little Aristo is my fathers pocket calculator, he always had a little slide rule with him. I don't know why, maybe to calculate the petrol consumption of his car ;-)
4 years ago.
yokopakumayoko Francesco
yokopakumayoko Franc…
Not only Flickr
4 years ago.
I don't know the Produx, but in the 60s my job involved extensive calculations with slide rules. Having done all the calculations, the data was compiled on forms and then analysed with rotating drum calculators. Thanks for rekindling some old memories with this shot.
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4 years ago.
François Labarbe has replied to tiabunna
With the Produx you can only add and subtract. I don't know how my father got it but I have the thing all my life in house see lying around.
The slide rule is quite suddenly disappeared from our lives. My son, who got his technical training at the TU Delft, asked recently what it was and how it worked ;-)
4 years ago. Edited 4 years ago.
I was taught to use a slide rule when at school.
I used to have a calculator similar the the other one. You could multiply and divide by putting the same number however many times you needed it- not very helpful if you were working with large numbers...
4 years ago.
François Labarbe has replied to spacemouses
If you like gambling a slide rule is ideal ;-)
4 years ago.
Gloucester, a Bottled Spider
Gloucester, a Bottle…
3 years ago.