Key Points:
  • Winter and Crary were a female/male team of inventors from Illinois who collaborated to design and obtain a patent for an early version of a calculator and keyboard.
  • Winter is one of a very small number of female inventors in the history of American invention.
  • Apart from the calculator, Crary held other patents for other inventions, including a gear cutter, a workpiece chuck, and an electric arc light.

During the age of invention, some ideas were simply too big and too great to be contained by one mind. As such, there are several notable inventor duos throughout the history of the computer. One such pairing is that of Mary E. Winter and Cushman W. Crary, a pair of Illinoisans whose work in the field of mathematics helped to inspire both the computer and the calculator in one.

Who Were Winter and Crary?

Mary E. Winter and Cushman W. Crary, abbreviated here as Winter and Crary, were two Illinois residents who came together to collaborate on an early version of the calculator and the keyboard that we know and depend on in our modern world. Back in the late 1800s, when Winter and Crary patented their invention, Winter was just one of only an incredibly minuscule number of female inventors. This fact just makes their mechanical calculator invention that much more significant. 

Quick Facts

Full Name
Mary E. Winter and Cushman W. Crary
Net Worth
Winter: Two Crary: Three
Winter: American Crary: American
Place of Birth
Winter: Galesburg, IL Crary: Potsdam, NY
Fields of Expertise
Keyboard adding machine

Early Life

Not much at all is known about Mary E. Winter outside of her association with Crary and their patented invention, but there is some information out there about Cushman W. Crary and his life before his one-off collaboration with Winter. Even then, the information is not exactly extensive — Cushman W. Crary was born on August 12th, 1822, in Potsdam, St. Lawrence County, New York. He was the son of Elias Crary and Abigail Walker of Vermont. Beyond this, there is no other readily available information about either Winter or Crary’s life before their patent.

What Did Winter and Crary Invent?

Beyond their work as a pair, Winter and Crary were still individuals with their own respective lives and careers apart from their lone joint venture. First, let’s discuss their keyboard adding machine, then move on to the things Crary did on his own. 

A diagram of the adding machine designed by Winter and Crary.

The Keyboard Adding Machine

Mary E. Winter and Cushman W. Crary are responsible for jointly patenting a keyboard adding machine in May of 1882. Not only was it one of the first mechanical calculators to be patented in the world, but it was also one of the earliest machines to be patented by a woman in the United States.

Here’s how it worked: Any given number would be displayed through a single slot on the machine. When the user would hit a number on the keyboard, a wheel inside the machine would then rotate to correspond with that number and show the new number. For example, if the number 5 was displayed and the number 4 was keyed in, then the wheel would rotate to display the number 9. The hidden wheel was capable of displaying numbers up to 300, at which point an inner wheel would begin displaying numbers  301 through 600. 

The keyboard had ten keys, 1 through 10. Each key was T-shaped, and each was hinged or pivoted at one end of their heads to the arms that moved the ratchet wheel. There are two sets of arms for each of the two wheels, one set to move the inner wheel and one set to move the outer.

Crary’s Solo Inventions

Beyond his work with Mary E. Winter, Cushman W. Crary had a few patents of his own that came after the invention of their mechanical calculator: A gear cutter, patented in 1883, a workpiece chuck, patented in 1884, and an electric arc light, patented in 1886.

Winter and Crary: Marriage, Children, and Personal Life


Mary E. Winter married a Massachusetts architect named Asaph Newton Carpenter in 1853 and moved to Illinois in 1854. Crary, on the other hand, has a couple of recorded marriages: One to Hannah Rowena Nichols on July 3rd, 1846, and one to Caroline Cass following Nichols’s death in 1875.


Winter and her husband Asaph had two daughters after moving to Illinois. Crary is on-record for having three children with his first wife Hannah.


It seems the greatest tragedy in Winter’s life is that there simply isn’t much else to be known about her outside of her invention with Crary and that the history books are robbed of significant biographical information about a trailblazing woman inventor who helped carve the way for future females in the field. 

In Crary’s life, the greatest tragedy was either the death of his first wife after nearly 30 years of marriage or his death at the age of 91.

Up Next…

Winter and Crary – Complete Biography, History, and Inventions FAQs (Frequently Asked Questions) 

Who were Winter and Crary?

Winter and Crary were a pair of inventors residing in Illinois at the time of their first — and, according to what’s known about them, their only — invention as a duo.

What did Winter and Crary invent?

Winter and Crary invented a keyboard adding machine in 1882.

What did Winter and Crary build?

Winter and Crary built a mechanical calculator that consisted of a ratchet wheel, a dial plate, and a keyboard for inputting numbers.

When were Winter and Crary born?

Winter’s birth date remains unknown, while Crary was born on August 12tth, 1822.

When did Winter and Crary die?

Winter’s date of death isn’t known, but Crary died on April 21st, 1914.

How did Winter and Crary die?

Winter and Crary’s cause of death is unknown, but in Crary’s case, it’s fair to assume old age was the reason for his passing at the age of 91.

About the Author

More from History-Computer

  • Available here:
  • Available here:
  • Available here: