Trials of Self-hinding Reapers at Aighurth. 
137 
injector and donkey feed-pumps without their disadvantages. 
This desideratum Messrs. Hodgkin, Neuhaus and Co. profess to 
have accomplished in their Hjdrotrophe, a special adaptation of 
their Pulsometer pump. 
The accompanying sectional illustrations clearly show the 
mechanical construction of the Hydrotrophe. 
Fig. 9. — Transverse Section of the Hydrotrophe. 
N 
The Hydrotrophe consists of two chambers, A A, contained in one cast- 
ing, connected at tlie top by a neck, J, containing the steam ball-valve B, 
■which, by its oscillation, admits the steam alternately to the chambers, and 
at the bottom by a breeches-piece on which the junction seats D D and 
suction valves C C are placed. On the side of the chambers is attached the 
discharge-box 0, containing the delivery seats E E and the valves F F. Doors, 
H H H, are fitted to permit inspection of the suction and delivery valves, and to 
