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.
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