Here's my wonderful adding machine, I think my model is from the 1940's.
The base is bakelite, and at a handy angle, and the machine itself can be lifted from the base, so it is portable. The little dials are turned with the stylus to add and subtract, and there are directions for multiplication and division. They did expect you to know your basic math, though - "we take for granted that every user...knows the multiplication tables." The little metal thing on the left pulls out to zero the numbers.
Here's a link to the workings of the adding machine - in German. I used Google translator to read it, and it worked quite well. Mine is #2.
http://www.boelters.de/Rechenmaschinen/_Lightning/Lightning.html
This picture above isn't mine, and I don't have the box. I do, however, have the original instruction booklet ("How to Get the Most from Your New Lightning Sesk Model Portable Adding Machine") and a one-year guarantee certificate.
This little machine is a joy to use, much more fun than an electronic calculator. Of course, the Lightning can't graph, but nothing is perfect.
Irena
The base is bakelite, and at a handy angle, and the machine itself can be lifted from the base, so it is portable. The little dials are turned with the stylus to add and subtract, and there are directions for multiplication and division. They did expect you to know your basic math, though - "we take for granted that every user...knows the multiplication tables." The little metal thing on the left pulls out to zero the numbers.
Here's a link to the workings of the adding machine - in German. I used Google translator to read it, and it worked quite well. Mine is #2.
http://www.boelters.de/Rechenmaschinen/_Lightning/Lightning.html
This picture above isn't mine, and I don't have the box. I do, however, have the original instruction booklet ("How to Get the Most from Your New Lightning Sesk Model Portable Adding Machine") and a one-year guarantee certificate.
This little machine is a joy to use, much more fun than an electronic calculator. Of course, the Lightning can't graph, but nothing is perfect.
Irena