The DHIATENSOR keyboard
September 6th, 2024 at 9:04 am (Engineering, Technology)
While visiting Montreal, I found this fascinating American typewriter on display at the small museum tucked into a grand Bank of Montreal building:
The compact size and unusual key layout caught my eye. I looked it up later and found out that it’s a Blickensderfer typewriter, invented in 1892 by George Canfield Blickensderfer. (Note that the caption says 1884 but I’m guessing this is a typo, since the Model 5 was not introduced until 1893, and the Model 7, which is what appears in the photo, was introduced in 1897.) It featured a lot of innovations compared to existing typewriters, including a much more compact size, fewer parts, lighter weight, the careful choice of keyboard layout, and a rotating typewheel that contained all of the letters and symbols in one place, in contrast to the individual key-arms with one letter per arm! The typewheel meant that you could change the machine’s entire font by swapping it for another typewheel.
The keyboard layout was carefully chosen. “Blickensderfer determined that 85% of words contained these letters, DHIATENSOR,” (Wikipedia) and so those letters were used for the home (bottom) row of the keyboard. The earlier QWERTY layout (1874) was designed to minimize the chance of the key-arms hitting each other, something the Blickensderfer model did not have to worry about.
I’d love to get to type on one of these machines. I’d have to re-learn touch typing with the different layout, but what a marvelous machine, packed with ingenuity!