Contact Us

The Ken-Add Manual Calculator from the 1950′s Was Made in Duluth and is now in the National Museum of American History

eBay

Does anyone remember this? It is the Ken-Add manual calculator or adding machine that was manufactured by the Ken-Add Machine Co. based right here in Duluth.

The company has since disappeared, but the Ken-Add calculator has a place in American history in a collection at the Smithsonian National Museum of American History, according to their website:

This four-wheeled stylus-operated adding machine has two copper-colored wheels for cents and two silver-colored wheels for dollars. There are numbers on the cover around each wheel. No complementary digits are indicated. Above the wheels are four windows that indicate the total. At the back is a plastic container for the metal stylus. Inside the lid of the case is a so-called magic slate for jotting down and erasing numbers. The adding machine, stylus, and slate fit in an aluminum case.

An account of the Ken + Add appeared in Mathematics Teacher in December 1952, where it was recommended not only as a practical adding machine but as a fascinating toy and an aid to arithmetic teaching. It was advertised in Arithmetic Teacher as late as 1956.

 

You can find this randomly on eBay and other collectible websites. Does anyone have any memories of either this machine or the company based here in Duluth? If you do, please share below.

More from KOOL 101.7

Best of the Web

Leave a Comment

It appears that you already have an account created within our VIP network of sites on . To keep your points and personal information safe, we need to verify that it's really you. To activate your account, please confirm your password. When you have confirmed your password, you will be able to log in through Facebook on both sites.

Forgot your password?

*Please note that your points, prizes and activities will not be shared between programs within our VIP network.

It appears that you already have an account on this site associated with . To connect your existing account with your Facebook account, just click on the account activation button below. You will maintain your existing profile and VIP program points. After you do this, you will be able to always log in to http://kool1017.com using your Facebook account.

*Please note that your points, prizes and activities will not be shared between programs within our VIP network.

Please fill out the information below to help us provide you a better experience.

Register on Kool 101.7 Radio quickly by logging in with your Facebook account. It's just as secure, and no password to remember!

Not a Member? Sign Up Here.

Sign up for an account to comment, share your thoughts, and earn points to get great prizes.

Register on Kool 101.7 Radio quickly by logging in with your Facebook account. It's just as secure, and no password to remember!