1831.] 
Description of the Hydraulic Heart , dfc. 
291 
VII. Description of the Hydraulic Heart for irrigation and draining. 
By H. Pidctington, Esq. Foreign Sec. Agr. Soc. 
[Translated from the 25th No. of Annals of Science and Agriculture of the Havun- 
nah, for the Horticultural and Agricultural Society of India.] 
The Agricultural Society of Paris, in March 1827, awarded to M. Doudier its 
gold medal for the useful modifications of this machine invented by him, which ren- 
der it applicable to agricultural purposes. 
The Hydraulic Heart consists of a horizontal cylinder, part of the circumfer- 
ence of which is cut out, and upon this part is fixed a chest, in the sides and co- 
ver of which are valves for the admission and expulsion of the water. The inte- 
rior of this apparatus is divided into two parts by a partition fixed to the cover, 
and which at its lower edge terminates in a moveable flap, which turns on an 
axis in the centre of the cylinder. 
On the upper part of the chest is a head terminating in a pipe for carrying the 
water raised. 
I J 1. XIV. fig. 3. Lateral elevation of the Hydraulic Heart. 
4. Vertical section of the same. 
5. General elevation of the machine on a smaller scale, to show 
the mechanism for moving the flap. 
The same letters refer to the same objects in all the figures. 
A. a cylinder of copper, 8 inches in diameter and 10 long, placed horizontally ; 
shout one fourth part of its circumference is cut out, and a rectangular based 
chest B, the sides of which arc cut to fit the cylinder, is fitted upon it. 
The two ends of the cylinder A and of the chest B are closed, and, at the part 
corresponding to the axis of the cylinder, two holes with leather collars aie left to 
allow the moveable axis B to passthrough them- 
C (fig. 4.) The fixed partition resting on the sides of the chest and on the axis E. 
D. A moveable flap or wing fitted to the axis E, filling up exactly the space oim 
by the ends of the cylinder and the concavity of its inner circumference. 
The edges of this flap are fitted with slips of copper, which press against the 
sides by means of springs, and thus diminish the lriction. 
1- The axis on which the flap D is fixed. 
Tlie interior of the apparatus is thus divided into two variable cavities, between 
"diich no communication can take place on account of the partition and the flap D. 
The admission valves, a a a a, are fitted in the sloping sides of the chest Ba as 
tlj e expulsion valves, b b b b, are upon its cover j they should be of a size to allow 
tbe water to pass freely. , . . 
F - The head of the apparatus, terminated at its upper part by the rising pipe 
A pulley with a double groove fitted on the axis B ; two chains fixed to the 
Cl| ds of a lever I (fig. 3) are passed round each of the grooves of the pulley H. 
Jlus apparatus, fitted into a simple frame-work to keep it upright, is wrought 
l 7 the oscillating motion of the lever I, which, by its chains and the pulley H, 
give the same motion to the flap D, which thus describes an arc wit m t ic 
, -. v finder, whose length will be determined by the proportion of the lever to t ie 
diameter of the pulley. 
The moveable flap, reducing alternately the capacity of one side of the c\ m er, 
n ' es 0ut the water through the expulsion valves, b b, on the one sue, w n e 
t u t 011 the other is driven in by its own weight at the admission % ah es a a, and 
18 rc ‘ Vef sed immediately by the oscillating motion, produces the same ellect on 
6 °ther side, which thus gives a considerable stream of water . 
