Lagomarsino-Numeria Mod. 5905, s/n 84019
The calculator in my collection with the disctinction of having the longest name. Lagomarsino was an office machine company that manufactured the Totalia adding machines and Numeria multiplying machines. They use axial pinwheels, that are operated by cams linked to the keyboard.Thanks to Jaap Scherphuizen's website I know that the model number can be decoded as 5: numeria; 9: 11 places in the counter; 0: manual machine and the last 5 says that the counter has tens carry, and the machine has a negative indicator ...
In addition, the Rechnerlexikon has the manual for this exact machine...
The problem that always occurs with Numeria machines is that the cams start sticking on the axle they rotate on, and then rotating one cam will also rotate all the others that are stuck to the axle. You will for example type into the keyboard 0000000123 and get in the result register 000000220200123 ...all the results with 2 indicate that the cam on column 2 is sticky, and so are all the others that display a 2. If you try again with a number larger than 5, you will get an idea which of the second series of cams are also stuck - every number is formed by 2 different cams.
A bit of lubrication and wiggling usually clears that problem up. The axial pinwheels are quite reminiscent of those in the Kuhrt machines, although the Numeria uses two levers, and two discs with 5 and 4 pins each, and the result gear between them.
Some pictures of the mechanism:
And the machine itself:
The little window on the top left of the keyboard is a negative indicator - it becomes red to indicate that the counter register has been switched automatically to negative on a negative first turn of the crank.
I have another, electric, Lagomarsino-Numeria from the same era, a so called "Elettronumeria" model 8925. The 8 indicates a numeria model with multipication selectro buttons, and the 2 indicates that it is electric. The machine has stupidly impractically small multiplier preset buttons, and semi-automatic stop-division. The division took some time to get to work though, the machine refused to do a positive cycle after an underflow during division. Eventually, I got everything unblocked enough that it now works without issues.
First some pictures:
serial n° 080647
"pluritensione - anything between 110V DC and 280V AC would work with this machine...
...but you still need to select the correct voltage befoe you plug it in.
Now for some video of the machine in action:
I also have some earlier, brown Numeria's, which also still have a few issues that need to be resolved, so they are on the waiting list.