d approved tests,
of each important detail, usually made by expert engineers.

The report is too voluminous for reprint or even for condensation
in our columns. In looking it through, we are satisfied that the
experiments were accurately made, and that the engine exhibited great
working efficiency and economy.

As the engine has been recently illustrated and described in our
columns, we deem it unnecessary to dwell upon the details of its
construction. The water test of the previous exhibition was employed,
the water being this time measured, with indisputable accuracy, in a
tank, instead of by a meter as before.

The voluminous comparison of this engine with those previously
exhibited, seems unnecessary, and we think not in good taste in such a
report, however much it may possess of scientific interest. Moreover,
the circumstances under which the trials were respectively performed,
render the comparison difficult, if not unfair.

Mr. Lee concludes his report with a thorough endorsement of the theory
of Mr. Porter upon the action of the reciprocating parts of engines,
as set forth by the last named gentleman in recent articles in this
journal. He says:

"Under the resistance of 128.375 horse powers at the brake, the motion
of the engine was remarkably uniform; not the least diminution of
speed in passing the centers could be detected, illustrating very
satisfactorily the value, in this respect, of the speed employed, and
of the action of the reciprocating parts of the engine in equalizing
the rotative pressure on the crank through the stroke. The governor
was, during the trials and through the exhibition, nearly motionless,
while the load remained constant, and instantaneous in its action on
changes of resistance, maintaining a steadiness of running which left
nothing to be desired."

The judges--Prof. F. A. P. Barnard, Thos. J. Sloan, and Robert
Weir--speak in their report as follows:

"The performance of this engine has exceeded that of the two fine
engines which were on trial here last year. The results seem to be
without precedent in such engines. The engine ran from 11 to 12
hours repeatedly without showing a sign of a warm bearing, displaying
thorough perfection in all its parts. In all respects the engine is
first-class, and from the fact of its presenting weight with speed, as
a requisite for perfection in steam engines, it has opened a new era
in this necessary branch--its economy having been clearly d