Odhner Model A

Odhner, Model A

ser.no: 4 194

the earliest image with a long handle that we have [long handle started at ca 3400]

source: A.Plamondon

note: the instructions attached to the cover still shows the short handle model

source: A.Plamondon

ser.no: 4 941

source: K.Odhner

ser.no: 5 422

source: W.Szrek

translation of the instructions:

Please remember! Please remember!

To avoid damaging arithmometer and to get absolutely correct results it is necessary to respect the following before each use:

Carriage B should be set in steady position i.e. shift K should be located in one of the openings in the base. One can check it trying to shift carriage slightly to the left.
Turn both butterfly wings C till they click, this will cause displays to clear (set to zero).
Handle F should always make a full turn (forward and backward turn should always end in the handle position G).
One should turn handle F in a uniform manner without jerking with as steady speed as possible (150 turns per minute).
Lubricate turning parts 1-2 times per year with a drop of clean oil. You need to clean those parts first with benzene or clean the dust off with a cloth.