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Hydraulic Test Pump: Brass Valve Box with Glass Marble Valves and a Gas-Barrel Plunger (Cassell's, 1903)
A hand pump for testing a small boiler, a pipe or a fitting with water under pressure. Cassell's Cyclopaedia of Mechanics (1903) drills a brass rod into a valve box, uses two glass playing marbles as the valves, and works a plunger in a short length of gas or steam pipe through a gland made from an ordinary socket and nipple.
The source says it "would stand a pressure of 250 lb. per square inch easily". It has no gauge of its own: read the pressure on the work being tested.
Source: P. N. Hasluck (ed.), Cassell's Cyclopaedia of Mechanics, Third Series (1903), p. 291, "Simple Hydraulic Testing Pump". Picture: its Figs. 1-3.
Hagati
Unknown
Amabwiriza
1
1
Read Cassell's
Read Cassell's
"The pump here illustrated is designed for use in testing a small boiler, and for similar purposes; it will fulfil the purpose of pumps of costly design and workmanship, and can be built for a few pence. It consists of a rod of solid brass or gun-metal drilled out to the required sizes as shown in Fig. 1, and fitted with ordinary iron gas or steam bends at the top and bottom of valve box."
2
2
Drill the valve box
Drill the valve box
Drill a rod of solid brass (or gun-metal) lengthwise from both ends to the sizes in Fig. 1, so that each glass marble drops into a seating made by the drill: the suction valve below, the discharge valve above. Drill and tap both ends for the iron gas or steam pipe bends, and drill and tap the centre of the side to take the pump barrel. No sizes are given (unknown).
Ibikoresho by'iyi ntambwe:
Umurongo w'Umuringa w'Umuhondo1 valve boxIbikoresho bikenewe:
Ifatiro ry'Ameza
Icyuma Cyivumbura Gihagaze
Ibyuma Byinshi byo Gucukura
Agakoresho ko gukata imizingo y'ibyuma
Ingano zitazwi3
3
Fit the valves and bends
Fit the valves and bends
Drop a glass marble into each seating (glass is preferred: it is far rounder than clay marbles). Screw an iron gas or steam pipe bend into the bottom (the suction) and another into the top (the delivery). The upper pipe carries a small cross-bar that stops the discharge marble from blocking the outlet (Fig. 3); its material is not given (unknown).
Ibikoresho by'iyi ntambwe:
Amabuye y'ibirahure2 ibice
Igihuza cy'umuyoboro gifite imirya2 pipe bends
Ibikoresho bitazwi1 cross-barIbikoresho bikenewe:
Igifashi cy'imiyoboro4
4
Make the barrel and gland
Make the barrel and gland
Cut a short length of gas or steam pipe for the barrel: its length is set by the stroke the pump is to have. Screw one end into the valve box. Countersink the other (gland) end, screw an ordinary socket over it, and screw into the socket an ordinary nipple, also countersunk, as the gland. Fit a back nut on the nipple for screwing up the gland and fix it with a rivet so it cannot turn.
Ibikoresho by'iyi ntambwe:
Umuyoboro w'Amazi1 short lengthIgihuza cy'umuyoboro gifite imirya2 socket and nipple
Ecrou ifunga1 igice
Ibyuma byo guhambira1 igiceIbikoresho bikenewe:
Umucumita w'Ibyuma
Urutonde rw'ibikoresho byo kwagura utwoboIgifashi cy'imiyoboro
Inyundo ifite umutwe wa buruta5
5
Make the plunger
Make the plunger
File out the inside of the barrel roughly to remove scale and unevenness left by the pipe mandrel. Turn a plunger to fit it loosely, file two flats on one end and drill a hole there for a pin. The plunger's material and what the pin holds are not given (unknown).
Ibikoresho by'iyi ntambwe:
Ibikoresho bitazwi1 plungerIbikoresho bikenewe:
Amakariso (Ikariso ry'Intoki)
Imashini yo guhinguza icyumaIcyuma Cyivumbura GihagazeIbyuma Byinshi byo Gucukura6
6
Mount and use
Mount and use
Fix the pump down with two ordinary bent clips over the barrel near its ends (Fig. 2). Put the suction bend in water, connect the delivery to the work and work the plunger. Cassell's: the pump "would stand a pressure of 250 lb. per square inch easily". The clip material is not given (unknown).
Ibikoresho by'iyi ntambwe:
Ibikoresho bitazwi2 bent clipsIbikoresho bikenewe:
Igifashi cy'imiyoboroIbikoresho
7- 1 valve boxUmwanya
- 2 ibiceUmwanya
- 2 socket and nippleUmwanya
- 2 bent clipsUmwanya
- 1 short lengthUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
Ibikoresho bikenewe
11- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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