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Nos. 1, 2, and 3.

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The continued success of the No. 1 and No, 9 “STUART ” Centrifugal Pumps has encouraged us to introduce a still larger size of similar type.

Their efficiency is remarkably high, and they are comparatively easy to build.
The standard Pumps are of gunmetal throughout, except the shafts, which are of rustless steel.

The Nos. 1 and 2 Pumps are designed with suitable feet by which they may be mounted on any convenient base. The No. 3 Pumps are supplied with a substantial cast iron bracket, providing an outside ball bearing— ensuring great rigidity and freedom from friction.

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We illustrate one of our No. 1 Pumps direct coupled to a 1/16th b.h.p. Electric Motor capable of delivering 180 gallons per hour to a 10-foot Head.

Price £5 15 0.

A similar Pumping Set consisting of a No, 2 Pump and a jth b.hp.
Motor to deliver 250 gallons per hour to a 10-foot head—

Price £7 15 0.

We can also quote for an electrically driven No. 3 Pump capable of delivering 600 gallons per hour to a 10-foot head at 1400 r.p.m.


To enable us to quote for exactly what is needed, tell us the head required, or height to which the water has to be pumped, the number of gallons per hour, the distance vertically from Pump to source of water supply, and also the orizontal distances, if any. State the nature of your electrical supply, viz., the voltage, whether D.C. or A.C., and if A.C., the “‘ frequency ” ; and whether ingle or Three-Phase.


A very competent centrifugal water pump capable of real world pumping solutions. The main body is two half castings with a cast rotor fitting between. Water is sucked in the pipe central on one of the main body castings and exits out the other pipe cast into the main body directed upThe original design has the body castings fairly symetrical. Later Stuart changed the design to a main body casting and a plate casting. The second type is detailed below. Another company sold a very similar pump to the second design but reversed the sides the shaft and water inlet were mounted. I have included a video of this pump as I couldnt find a stuart pump video, I have owned the stuart and copy and they are pretty much exactly the same size.

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Pump connected via a flexible joint to a M.T.B. No.1b.

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Full size Steam powered centrifugal water pump

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Two sizes:—No. 1 with 2in. rotor, and No. 2 with 23in. rotor.
They are designed for direct coupling.

For pumping a large volume to a moderate height the Centrifugal Pump is unrivalled. It is not capable of great suction lift, for this and for high heads a Stuart Piston Pump should be chosen. For details of these and complete electric motor driven pumps ask for List CP4m.

Pumps are often required to run for long periods without stopping; in such cases Stuart Pumps give wonderful service.

There are no valves and nothing to get out of order. The construction is a simple straightforward lathe job and a most pleasurable one.

A Centrifugal Pump has certain characteristics. It is best at, or below, water level so that the suction is flooded. It may, however, be up to 6in. above water level provided the suction delivery pipes are arranged as in the diagram. It will be seen that the bottom of the suction pipe (A) must be just above the top of the connection on the pump (B), carry the delivery pipe up at least 6in. before bending down. If, for convenience, the delivery is horizontal the delivery pipe (C) must also be above the connection on the pump (D).

This arrangement retains water in the pump and it is only necessary to prime through the delivery connection once on first installing the pump. On switching on the current there will be a few seconds before water flows.

For a suction lift of more than 6in. a foot valve must be used — it must hang vertically — to keep the pump filled.
As a centrifugal will lift a few feet only the pump should be as near the water level as possible. As the head is increased, the quantity of water pumped diminishes. At any particular speed there is a height above which water cannot be raised at all. With increase in height, power required goes down—vice-versa—the lower the head the greater the volume of water and the more power absorbed. But if the motor be over-loaded, the load may be decreased by throttling the delivery and reducing the quantity of water. Note that the delivery pipe may be closed completely without harm, the power absorbed is that required to churn water in he pump. Keep the delivery pipe as straight as possible and use easy bends.

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Best quality Gunmetal with balanced impeller—rustless steel spindle running in long gunmetal bearing which is fitted with screw-down grease lubricator and gland.

Spindle diam.: No. 1, 4in.; No. 2, ~,in. Connections are for rubber hose. The pump body can be rotated so that the delivery is horizontal.

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Finished Pumps of this design are not supplied.

We supply the Complete Set of Drawings, Materials, Screws, and Lubricator.
Brass Foot Valve and Strainer is available at extra cost.

Centrifugal Pump & S50


A very close copy of the later design Stuart pump. Its the same size but has the pipe on the small body casting and the drive shaft on the large body casting. I have owned the stuart and this copy and the impellor is pretty much the same size.

Our United States Agent writes :—
“Apropos of Centrifugal Pumps, we might note you here that the last Pump you supplied us (finished) a No. 2 size, was purchased by the City of Boston Fire Department for use on a large working model of the City’s newest Fireboat, where we understand it gives excellent satisfaction in supplying water to the various nozzles on the model ship. So it seems that even the Fire Department when they are in search of model machinery select from the ‘ Stuart’ line.”’

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