APPENDIX. EXPERIMENTS ON MR. THOMSON'S VORTEX WHEEL AT BALLYSILLAN, TO DETERMINE ITS EFFICIENCY. Abstract of Data and Calculations according to which the Vortex was designed:-Total Height of Fall = 24 feet. Standard quantity of Water = 420 cubic feet per Minute. Calculated Speed, 292.5 Revolutions per Minute. Radius of Friction Brake, 4 ft. 2 ins. Circumference, 26.18 feet. In the Table the quantity of Water passing over the Weir is calculated by means of very refined data arrived at by MM. Poncelot and Lesbros, and submitted to the Academy of Sciences in 1829. 6 39-31 5 26 1,800 331-2 23.21 7 718 355.8 354.4 46.31 6 9 1,800 292.7 23.77 *665 318.1 316.7 46.31 6 13 1,800 289.5 23.75 •665 318.1 316.7 Remarks on the above Experiments. It is to be observed that as the Experiments happened to be made in dry weather, the stream in none of them supplied the standard supply of water for which the wheel was particularly adapted. Even with the diminished quantity of water, the efficiencies experimentally found were very high. Also, from information received after the time of the Experiments, it happened that during the Experiments the joint rings of the Vortex were not screwed properly close to the rings of the wheel, and that on their being afterwards screwed close, the power of the wheel was sensibly increased. It is therefore probable that still higher efficiencies are attainable than those shown in the above Experiments. MEC Mechanism-continued. - - - to construct Watt's parallel mo- to multiply oscillations by means to produce a velocity which shall to produce a reciprocating inter- - ratchet-wheel and detent, 29 - wrapping connectors, 30 - endless cord or belt, 30 -speed pulleys, 32 - - guide pulleys, 34 to prevent wrapping connectors systems of pulleys, 36 - to produce a varying velocity ratio concentric wheels, 45 wheel-work when the axes are not to construct bevel wheels and bevel to construct bevel gear when the variable motions produced by 48 - Roemer's wheels, 49 intermittent and reciprocating mo- the rack and pinion, 50 sliding pieces, producing motion the wedge, or movable inclined the eccentric wheel, 52 |