ポーターの１８７３年（まあ）証言記述：打鍵速度毎分６０～８０ワード。すでに電信学校で使ってるって。

ポーターの１８７３年（まあ）証言記述：打鍵速度毎分６０～８０ワード。すでに電信学校で使ってるって。

5. E. PAYSON PORTER, 159 LaSalle street, Chicago. Sholes &
Gledden's Type Writer. This is a truly novel little machine, by the use
of which the operator is enabled to produce copy in the form of print
with twice the rapidity of the penman, and with the most perfect ease,
It is adapted for merchants, lawyers, editors, authors, etc. It requires
no especial skill in its manipulation, and one may readily become able
to write from sixty to eighty words per minute. The motion of the
hand is free, easy, and unconstrained, so that the monotonous move-
ment of the pen is avoided and the labor of writing performed with
far less fatigue to the muscles of the hand and arm. This machine
is in constant use at the National Telegraph College, of which the
exhibitor is proprietor, and who is also agent for the sale of this
valuable machine. The operation of this machine is simple. A set
of keys similar to those of a piano, upon each of which is a letter of
the alphabet. The operator presses upon a key, and by the mechan-
ical construction of this machine a letter is printed upon the paper
corresponding with the key touched. This little invention is destined
to lessen the arduous labors of the copyist, and is hailed with favor
by the telegraph operators and press of the country.
http://www.archive.org/stream/interstateexposi00vana#page/98/mode/1up

（展示者であり、電信学校経営者でもあるポーターは、販売エージェントでもある、とも。）

だからこそ、ウェスタン・テレグラフだかで、ポーターは片手で受信打鍵、できていたってことだろう。両手で受信打鍵するには、モールス電信の実用電鍵速度は、ポーターの受信能力に比してあまりにも遅く感じられた、。
ことに現役ではないステイガーの電鍵送信速度は、まったくもって遅く感じられたのではなかったか。
http://blog.goo.ne.jp/raycy/e/a2d659bf6d3a6488cd8c345ff2d4f0eb
http://blog.goo.ne.jp/raycy/e/bb660b657ce5c0e61ae2e19b3c766477
http://blog.goo.ne.jp/raycy/e/0ea7162a7697274b83ae09c4ba01a573