. Machinery and processes of the industrial arts, and apparatus of the exact sciences. , the pressure per square foot will be 21G0 is nearer to the truth to take the mean pressure at pounds; andit is upon this assumption that the determination is made for the purposeof the calculations above referred to. This statement was appended inthe original manuscript to the passage on page 80, and was designed toappear on that page as a foot-note; but the note was accidentally omitted. THOMPSONS ROTARY STEAM-ENGINE. In the description of Thompsons differential rotary steam-engine,commenci
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. , the pressure per square foot will be 21G0 is nearer to the truth to take the mean pressure at pounds; andit is upon this assumption that the determination is made for the purposeof the calculations above referred to. This statement was appended inthe original manuscript to the passage on page 80, and was designed toappear on that page as a foot-note; but the note was accidentally omitted. THOMPSONS ROTARY STEAM-ENGINE. In the description of Thompsons differential rotary steam-engine,commencing on page 87, it is remarked that it will be seen by com-paring these figures that there are two pairs of pistons, each pair beingattached to a core which occupies but half the length of the cylinder inthe direction of the axis. The comparison of the figures given does notillustrate the last part of this statement; and the reason of the disa-greement between the description and illustration is, that one of thewood-cuts designed for insertion in that place, having been accidentally. aeff™ mislaid, was omitted. This cut is here supplied. It represents theengine in elevation, with a longitudinal section of the cylinder, and of theelliptical gear-wheels which are directly driven by the pistons. One ofthe pairs of pistons is seen in complete section, attached to a core which 650 PARIS UNIVERSAL EXPOSITION. occupies but half the length of the cylinder. The other pair is out ofthe plane of the section, but the section of its central core is figure shows also, in longitudinal section, the cylindrical valveexhibited in cross-section in Fig. 16, and referred to on page 93. Theposition of this valve, as shown here and in Fig. 16, is that in which thesteam is shut off. The engine is started by turning the crank forty-fivedegrees to the right or to the left. If it be turned to the left, the steamwill enter and leave the engine in the direction of the arrows in Fig. 16,and
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
