AMERICAN INSTITUTE. 153 



struction the working parts are more durable and less liable to 

 injury from oxidation from sea-water. The connecting rods, D, 

 are attached to the bottom of the plungers, by which means great 

 steadiness of motion and directness of action is secured, and much 

 power saved in working. 



Instead of packing the piston head in the common manner, the 

 vacuum is produced b}^ causing tlie plungers — which are almost 

 of the same size as the pump-barrels, A — to pass through stuffing 

 boxes, J". If, from long use or unusual pressure, (as in the case 

 of fire) the packing in the stuffing boxes becomes loose, it is 

 quickly tightened without removing the plungers, by turning the 

 stuffing screws. This is regarded as a very desirable advantage 

 over ordinary pumps, as it will be unnecessary, in any case, to 

 take the pump apart for this purpose. 



In the operation of this invention the water enters the supply 

 pipe, E, chamber, F, and passes through raised valve seats, H, 

 and air chamber pipes, G, alternately, into air chamber, B, 

 whence it is discharged by hose pipe in the usual manner. 



As a ship's bilge or head pump, this improvement is of great 

 utility, since grain and other articles may be carried in bulk, 

 without any danger of choking the valves; the same pump is also 

 available in case of fire. 



Placed upon a small platform with wheels, the pump is adapted 

 as a fire engine for steamboats, villages, &;c., the cost being very 

 small. 



An attachment can be placed on the brake, so that power can 

 be applied if required, or the pump can be worked by hand. 



The ends of the brake bar are furnished with cavities, into 

 which the break levers, K, (which are furnished with the pump,) 

 are introduced. 



In consequence of the certainty of action and tightness of the 

 valves this pump is unequalled for pumping air for submarine or 

 other purposes. 



For mining, plantation, and all other hydraulic uses, it is con- 

 fidently asserted, that this pump has no superior for economy, 

 efficiency, and durability, and successful use. 



[Jl large silver medal awarded. 



