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Later the Yale & Towne Manufacturing
Company, to whom Mr. Emery had sold
his patents, disposed of them in turn to
William Sellers & Company. Mr. Sellers
designed a fifty-ton testing machine
which was built under Mr. Emery's pat-
ents and placed in the Watertown Arsenal,
Watertown, Massachusetts, where
Mr. Emery's large machine was already
in use. Under these patents machines
were also built by William Sellers &
Company for several of the technical
schools and colleges in the United States
and Europe. The War Department exhibited
one of these machines in the Government
Building at the Columbia Exposition
in Chicago in 1893, the machine
afterward going to Sibley College, Cornell
University.
After the Yale & Towne Manufacturing
Company sold his patents to William
Sellers & Company, Mr. Emery resigned
his position with them and resumed the
designing of cannon and projectiles in
which he had been interested during the
Civil War. He designed a gun carriage
for a twelve-inch rifle for the War Department
under the supervision of the
Board of Ordnance and Fortifications.
This design was never completed for the
reason that its construction required more
money than had been appropriated.
While with the Yale & Towne Manufac-
turing Company he designed and built
a car dynamometer for the Pennsylvania
Railroad Company to make autographic
records of the drawbar pull of locomo-
tives, the dynamometer having a capacity
of 28,000 pounds. Several years later, in
1902, he was asked by Mr. Vogt, mechanical
engineer of the Pennsylvania
railroad, to consider designing and constructing
another dynamometer for them,
as the old one was entirely inadequate to
measure the loads given by the increased
size of locomotives.
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259
Mr. Emery was confined to his room
with a broken knee cap at that time, but
decided he could undertake the work, and
he designed and built a car dynamometer
of 100,000 pounds capacity, the Pennsyl-
vania railroad designing and building the
car therefor. The dynamometer was put
into service in 1906 and is still in service.
In the meantime the continued growth
of locomotives and the introduction of the
electric locomotive have made the capacity
of this instrument inadequate, and
at present (1920) Mr. Emery is rebuilding
certain parts of this machine to increase
its capacity to measure 150,000 pounds
drawbar pull instead of 100,000 pounds.
In order to calibrate this instrument it
was necessary to have a very accurate
method of measuring hydraulic pressure,
and he designed and constructed an ap-
paratus for measuring hydraulic pressure
up to 3,000 pounds per square inch, sensi-
tive to 0.005 pound per square inch. In
order to adjust the weights for this ma-
chine a special scale, having very great
accuracy and sensitiveness, was con-
structed, using "Emery" plate fulcrums
instead of knife edges. Later an improved
form of this apparatus, having a
capacity of 4,000 pounds per square inch,
was built by him for the Bureau of Stand-
ards.
The next important undertaking which
engaged the attention of Mr. Emery was
the construction of two testing machines
for the Bureau of Standards in Washington.
One was for loads of 230,000 pounds
tension and compression, and the other
for loads of 1,150,000 pounds tension and
2,300,000 pounds compression, on specimens
of any length up to thirty-three feet.
While building these machines, Mr.
Emery also constructed a machine to
calibrate testing machines, which was in-
stalled in his laboratory in Glenbrook,
Connecticut. The calibrating machine is