AN IMPROVED EIRE PUMP.
The accompanying illustrations represent a pump specially designed for protecting public buildings, factories, warehouses, stores, lumber yards, etc., from fire. It is a large stationary fire engine, which can be operated at a high speed without danger of injury. For operating on the automatic system, an improved regulator is furnished which will maintain any desired water pressure upon the pipes. The water cylinder has extra large valve area. Hand hole plates are provided for ready access to the valves. The lining of pump is of brass, and the piston, piston rod and valve seats are of the best bronze. It is manufactured by the Dean Brothers’ Steam Pump Works of Indianapolis, Ind.
The second cut shows in detail the construction of the steam valve gear of the Dean Brothers’ steam pump. The motion of the small slide valve is continuous, like that derived from an eccentric. Other steam pumps have an intermittent motion of this valve. The ports leading to the chest piston are closed, except at the moment the main piston is being reversed ; hence the makers claim there can be no “ flow through ” or waste of steam in case the chest piston becomes worn. The operation of this valve gear is described as follows :
The auxiliary valve F slides on the valve seat E’, and is provided on its under side with diagonal exhaust cavities dd‘. The ports b b’ and exhaust port c are arranged in the shape of a triangle, and the diagonal cavities diverge from each other, whereby the cavity d connects the ports b and c, and cavity dx connects the ports b1 and c when the valve /”is in extreme positions.
When the main piston moves from left to right the valve /”is moved in an opposite direction, opening the port b‘, admitting steam to the sub-cylinder E’ at the moment the main piston has reached the limit of its stroke, whereby the auxiliary piston E is forced to the left, opening the main port and admitting steam to the steam cylinder, consequently reversing the movement of the main piston. On the return stroke of the main piston the movement of the auxiliary valve is reversed, whereby the port bl is closed, and at the moment the main piston has reached the limit of its outer stroke, the port b is opened by the valve F, causing the auxiliary piston E to reverse its motion, opening the main port and reversing the motion of the main piston.
By this continuous movement of the auxiliary slide valve, the ports b and b’ are kept closed except at the end of each stroke, at the moment the main piston is reversed. This prevents any waste of steam in case the auxiliary piston is worn enough to leak, as the ports b and £’ arc closed. The arrangement of ports admits of a short valve with a long travel. The length of stroke of pump can be regulated by moving the stud up or down in the segmental slot G’, as this varies the travel of the auxiliary valve, thereby reversing the stroke of main piston earlier or later. The action is noiseless.
THE CINCINNATI WATER System.—At a meeting of the Water Supply Commissioners, with President Mayor Smith, chairman, Captain William P. Anderson and Dr. T. W. Graydon, E.W. Pettit, secretary, and Expert Ilermony, civil engineer for the board, reported progress in the work of preliminary surveys. All this side of the Miami has been completed, but on the other side of the river a commencement has only been made. No river soundings have yet been taken, owing to the high stage of water. As to the filtering, Mr. Fladd has only yet submitted plans and estimates for experiments upon which he is ready to report. Mr. Ilermony recommended that the mechanical filters be tried on the Price Hill water plant—that is to say, on the top of the hill at the outlet of the supply pipe. There are three filtering companies, and they can be tested at one and the same time, by dividing the entire pipe supply. The construction was ordered of a house fitted up for the experiments in filtration, to cost not over $1350, and it was resolved that the experiments be referred to Dr. T. W. Graydon as a special committee, with power to act.
CINCINNATI, November 3. F. L. B.