Imagens das páginas
PDF
ePub

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.

[blocks in formation]

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

[blocks in formation]

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.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small]
[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors]
[merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors]

MEC

Mechanism-continued.

-

-

-

to construct Watt's parallel mo-
tion, 23

to multiply oscillations by means
of link-work, 25

to produce a velocity which shall
be rapidly retarded by means of
link-work, 26

to produce a reciprocating inter-
mittent motion by means of link-
work, 27

- ratchet-wheel and detent, 29
intermittent motion produced by
link-work connected with a ratchet-
wheel, 29

- wrapping connectors, 30

- endless cord or belt, 30

-speed pulleys, 32

-

-

guide pulleys, 34

to prevent wrapping connectors
from slipping, 35

systems of pulleys, 36

- to produce a varying velocity ratio
by means of wrapping connectors, 38
on wheel-work producing motion
by rolling contact when the axes of
motion are parallel, 40
idle wheels, 44
annular wheels, 44

concentric wheels, 45

wheel-work when the axes are not
parallel to each other, 45
face-wheel and lantern, 45
crown-wheels, 46

to construct bevel wheels and bevel
gear, when the axes are in the same
plane, 46

to construct bevel gear when the
axes are not in the same plane, 47

variable motions produced by
wheel-work having rolling contact,

48

- Roemer's wheels, 49

intermittent and reciprocating mo-
tions, produced by wheel-work
having rolling contact, 49

the rack and pinion, 50

sliding pieces, producing motion
by sliding contact, 51

the wedge, or movable inclined
plane, 51

the eccentric wheel, 52

« AnteriorContinuar »