Origin of modern calculating machinesTurck, J. A. V.
History
Origin of modern calculating machines
Turck, J. A. V.
Calculators
On the same date, but of later application, another patent, No. 388118,
was issued to Burroughs which claimed to combine the recording of the
numerical items and the recording of the totals in one machine. Some of
the drawings of this patent have been reproduced. (See opposite page.)
MACHINE OF EARLY BURROUGHS PATENT
Referring to the drawings of the Burroughs patent, it will be noted,
that in outward form, the machine is similar to the Burroughs machine
of today. To give a detailed description of the construction of the
machine of this Burroughs patent would make tedious reading and take
unnecessary space.
[Sidenote: _General scheme of Burroughs’ first inventions_]
The principle involved in the mechanism for recording the items is very
similar to that of the Pottin invention; the setting of the type wheels
being effected as in the Pottin machine by means of segment gears which
the depression of the keys serves to unlatch, and acts to gauge the
additive degree of their movement.
Burroughs used the inking form of type proposed as an alternative by
Pottin in his patent specification instead of the needles shown in the
Pottin drawings.
In the Burroughs patent, as in the Pottin, it will be noted that there
are two sets of wheels bearing figures, one set of which, marked J,
situated at the rear, are the type-wheels, and the other set, marked A,
at the front of the machine, are for the accumulation of the totals.
For each denominational order of the type and total wheels, there
is provided an actuating segmental gear, consisting of a two-armed
segmental lever pivoted to the shaft C, and having the gear teeth of
its rear arm constantly in mesh with the pinion gear of the type-wheel
J, and the gear teeth of the forward arm normally presented to, but out
of mesh with the pinion gear of its total wheel A.
Each of these denominational actuators or segment gears is provided
with a stop projection X², at the top end of its forward gear rack,
which serves as a means for interrupting the downward movement of
that end of the segment lever, and thus controls its movement as a
denominational actuator.
It will be noted that instead of the key-stems acting directly as a
stop for the denominational actuators, as in the Pottin invention,
Burroughs used a bell crank type of key lever and the stop-wire C¹ as
an intermediate means, and in this manner produced a flat keyboard more
practical for key manipulation.
[Sidenote: _Brief description of machine of early Burroughs patents_]
The stop-wires C¹, as will be noted, are arranged to slide in slots
of the framework, and while normally not presented in the path of the
stop-projection X², of the denominational actuators, it may be observed
that by the depression of the proper key any one of them may be drawn
rearward and into the path of the stop projection X², of its related
actuator, and thus serve as a means to intercept the downward action of
the actuator.
Public-domain text, read in full here on John Shaqi.
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