History of the Typewriter

Forfatter: Geo. Carl Mares

År: 1909

Forlag: Guilbert Pitman

Sted: London

Sider: 318

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— 81 — were made removable, and were altered in shape. The carriage, also, was made to run on ball-bearings, and so slightly was the tension required to be adjusted, that thejriction proved to be imperceptible, so much so, in fact, that the No. io assumed the title of “ The Light Running Yost.” Fig. 64 Incidentally, also, an entirely set system of leverage was adopted. As will be seen from Fig. 35, p. 52, the key stems were so made that they swung on fulcrum rods immediately under the key-top. This caused the plate? to swing to the operator, thereby pulling the connecting wire. The movement thus imparted was considerably accentuated at the further end, and so the slightest depres- sion possible was sufficient to bring the type to the printing point. An examination of this sectional view with that of the earlier model will reveal the curious fact that, for the first time in the history of the Yost, a slight spiral spring is used to bring the types back to the point of rest, all previous models returning by force of gravity- alone. The No. 10 also introduced a novel form of star wheel escapment. The Yost Company have also introduced machines of special keyboards, adapted to various uses, as well as numerous minor devices calculated to add to the efficiency of their machine under special conditions. 6