Yost No 1 typewriter, 1889.
© Science Museum / Science & Society Picture Library
The Yost was renowned for the quality of its output. It was developed in the United States by George Washington Yost and three other engineers between 1887 and 1889. As in early Remington machines, the type bars are placed below the paper carriage and strike upwards, so the typist cannot see what is being typed. Yost added an alignment plate to ensure accurate printing and a 'grashopper' action which allowed the use of inking pads instead of a ribbon. The double keyboard did away with the shift key, another source of inaccuracy.