# Arithmometer Felix M review

• Translation

I was putting things in order in a garage, when I found an arithmometer Felix M. It is old school iron gadget, there are no electronics inside.

Ages ago, my father used to work as an engineer. He had used a student slide rule & a piece of sheet for calculating, so, he bought an arithmometer Felix M in 1978 for increasing calculation speed. It was the decline of the arithmometers. On one hand, it was possible to buy an Elektronika B3-18A, but on the other hand, a price was stratospheric, The price was 220rub, but an engineer salary was about 120-140rub. However, an arithmometer price was 15rub. An arithmometer price was winning argument & my father bought it. Interesting fact: the Felix M is a great traveller. It was bought in Cherepovets, moved to from Vladivostok to Baikonur, stayed in Chelyabinsk and finally moved to Saint Petersburg.

# Review

The arithmometer weight is about 5kg. It was stored in a garage about 20-25 years. As a result, doesn't look really good, however, it works fine.

Front view:

2. Per digit key for setup number.
3. Blocker.
4. Counter reset handler.
5. Counter.
6. Result.
7. Shift handle.
8. Result reset handler.

Left side view:

Rear view:

Right side view:

Bottom view:

Top view:

Counter:

Result:

Inside view:

# Demo

How does it work? Let's multiply 11 by 321:

1. Select 11.
2. The 1st turn — multiple by 1.
3. Right shift by 1.
4. The 2nd turn — multiple by 20 and increase the previous result.
5. Right shift by 1.
6. The 3rd turn — multiple by 300 and increase the previous result.
7. The result is 3531.

# P.S.

It is crosspost

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I've heard about them but never seen. Do you mind cleaning it from dust inside and oiling the mechanism?
0

Well, it’s a sophisticated question… I did photos 6 years ago for the original post. The gadget is a part of decorations in my apartments. I have a task in a trello for reparing & cleaning the gadget… however, I have moved it from Chelyabinsk to Saint Petersburg only.

0
I think it would be a good idea to use soft type of anti-rust chemicals. I'd recommend a Trilon-B. It won't do any harm to the metal as it's not an acid.
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thank you, i've added this note into trello card. I hope I will do update for that post
+1
«Right shit» by 1 — please read your post carefully. However, a very nice antique mechanic piece of equipment :)
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Thank you!