38 
Account of a new Hydraulic Machine < 
III. — Account of a new Hydraulic Machine, invented by Mr. Joseph Eve. 
[ Journal of Science and the Arts, No. XLIV.] 
Sir, 
I have not perceived in any of the scientific publications of the metropolis, 
amongst which yours holds such a distinguished rank, a notice of an hydraulic ma* 
chine, invented by Mr. Joseph Eve, (for which a patent was obtained,) which is 
now exhibiting in the manufactory of Taylor and Jones, 11, Jewin Crescent, Crip- 
plegate. 
The machine I allude to, is a pump, with no valves to open and close, the mov- 
ing parts being rotatory ; their speed may, therefore, be increased at pleasure, and 
to an almost unlimited degree. The water pumped up is in proportion to that 
speed of the revolving parts, and to the force applied. 
It is the most ingenious, and probably one of the most valuable inventions in 
which the late years have been so prolific. The few scientific, unprejudiced, and 
practical persons who have seen the machine, have given the most favourable opi- 
nion as to its utility. However, I will proceed to describe this pump, and its per- 
formance. In Plate I, A shows a front view ; and B an interior view, after the 
end o! the case with the cog-wheels is removed. 
The principle is this. Two cylinders of equal diameter (3£ inches,) and equal 
length (G inches,) move in close contact on axes or pivots, and revolve in opposite 
directions, in an outer case or box. These cylinders have each two wings, of three- 
f ou rt I is of au inch area, and two grooves ; and as they revolve, the wing of one cy- 
linder falls regularly into the groove of the other, alternately, and so on in rota- 
tion ; and in orrirr that the groove may present itself regularly to the wings of the 
opposite cylinder, and let them pass, cog-wheels, placed outside the case, are fixed 
to the axes or pivots, which project : these cog-wheels ensure not only an even re- 
volution ot the two moving parts, but they communicate the power,' which is ap- 
plied by means of a handle, to the axis ol a large toothed wheel gearing into one of 
the two cog-wheels. 
The pump case is placed upon a common pipe, descending down tn the well 21 
feet below. Two men, turning the handle, raise half a ton of water in three mi. 
notes with this small pump ; which is allowed to he a most satisfactory result, con- 
sidermg that, as the first pump constructed on this principle, it has of course many 
imperfections. ' 
« JtL SUi ! StitU ‘ inS ., an J' ir ‘ Ve , SRel with a hose a " d P'P<h tl,e machine becomes the most 
p , s long, and effectual fire engine It mav be converted into a water-wheel, 
Where a small stream with a high fall of water exists, or be acted upon by steam 
as a rotatory steam engine. 
«o 1 f he . adva,Ua « es which it possesses over common pumps are too manifold and 
seii-evment. 1 he most conspicuous are,- a sa. ing of power, on account of the 
notion being much less than in ordinary pumps. It requires no leathering, being 
made entirely of metal ; it does not wear, as no parts touch or rub except the axes 
orpivots on their bearings. Its simplicity, strength, and elegance, and the ease 
J 1 , w h |ch ** turned into a fire-engine, the saving of room, and weight in pump. 
ork, it applied to <1 ep wells or shafts in mines, the advantages as a ship’s pump, 
”HT’ a,ul too numerous here to enumerate; but so self-evident, that I shall 
not dwell longer on the subject. 
I would invite you, and your scientific readers, to inspect the pump at Messrs. 
Taylor and Jones s, who, I am informed, are authorized to execute orders for 
pumps and engines on this principle. 6 S tor 
I am, respectfully. Sir, 
Your obedient servant, 
Goswell Road , Nov. 22, 1826. A SlJBSCK1BEB aild Engineer. 
IV. On the probable Decomposition of certain Gaseous Compounds of Carbon 
and Hydrogen, during sudden Expansion. 
[Journal of Science and the Arts, No. 1,1 
Some very singular appearances have been observed bv Mr a „ 
Portable Gas Works, which have led him to believe that chemical ’ , r ° n ’ of the 
stoned by the sudden expansion of oil gas, which do rimhann 'u han p* are occa - 
is gradual ; a striking result of the change being rhe el t! "' “ eu the expansion 
£ B> t separation of carbon from the 
