the stops, _s_. These latter are affixed to the rod, S, whose lower
extremity is threaded, and which may be moved vertically, as slightly
as may be desired, through the medium of the pinions, S¹, when the
hand-wheel, V, is revolved. A datum point, _v_, and a graduated
socket, _v¹_, allow the position of the stops, _s_, and consequently
the degree of expansion, to be known.

Steam is introduced into the small cylinder through the conduit, _i_,
and its passage into the large one is effected through the conduit,
_f_. The escape into the interior of the frame is effected, after
expansion, through the horizontal conduit, _h_. The pipe, H, leads
this exhaust steam to the open air.

The pipe, I, leads steam into the jacket, C¹, of the large cylinder,
this latter being provided in addition with a casing of wood, C², so
as to completely prevent chilling.

The regulator, R, is after the Büss pattern, and is set in motion by a
belt which runs over the pulleys, _a_ and _a¹_. It is mounted upon a
distributing box, R¹, to which steam is led from the boiler by the
pipe, _r¹_. After traversing this box, the steam enters the slide
valve box through the pipe, _r²_, its admission thereto being
regulated by the hand-wheel, R², which likewise serves for stopping
the engine.

The cocks, _x_, are fixed at the base of the uprights, B, for drawing
from the frame the condensed water that has accumulated therein.

The lubricating apparatus, V, which communicates, through the tube,
_u_, with the steam port, _r¹_, permits oil to be sent to the large