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Museum Artifacts Part 2

Museum Artifacts Part 1​  ​    Museum Artifacts Part 3​        All Museum Photos​


COMPRESSED AIR METER

A COMPRESSED AIR METER used in conjunction with a Venturi in the airline.

Compressors at Rosherville Power Station supplied air to a compressed air grid. This grid supplied air to the Central District Gold mines. This meter was located at Rose Deep gold mine.

The meter has a unique air-driven clock.

The meter is on loan to Gold Reef City, Johannesburg. It can be viewed at the entrance to the mine-shaft in this museum and theme park.​

PAI​NTING OF HIGHVELD POWER STATION

An original oil painting of Highveld Power Station by Hennie Maree.
Hennie Maree worked at ESKOM’s Taaibos Power Station, which was situated nearby.
The size of the painting is 2,5m long x 1,5m wide.
The painting can be viewed at ESKOM, Megawatt Park, Sandton.

TURBINE USED AT SABIE RIVER GORGE HYDRO STATI​ON

This is the remaining turbine of three used at Sabie River Gorge Hydro ​Power Station. This power station was the first power station designed by engineers employed by the Electricity Supply Commission (ESCOM). The power station was established to supply electrical power to the gold mines in the Sabie district of Mpumalanga (or Eastern Transvaal as it was then known.)

Sabie River Gorge power station operated from 1 April 1928 until it was decommissioned on 5 November 1964.
James Gordon & Company Limited of London manufactured the three turbines in 1925.

TECHNICAL DESCRIPTION

A Francis type turbine and alternator, 450kW 600kVA 750rpm, three-phase, 50 cycles, 3300 volts. The turbine and alternator operated under 64 metres static head of water.

The turbine is on loan to Gold Reef City, Johannesburg. It can be viewed at the mine-shaft in this theme park.​

PORTABLE TEMPERATURE INDICATOR ​

A "RESILIA" PORTABLE TEMPERATURE INDICATOR manufactured by Foster Instrument Company, England. Circa 1945. Using a thermocouple as a sensor, it measured temperature.

Scaled 0 - 7 x 100°C and 0 - 12,9 x 100°F Mirror scale.

Type no. 751 YX/6
Provision is made for the simultaneous connection of 6 thermocouples, any one of which may be selected by key switch.
A portable instrument in a wooden case.
Approximate overall dimensions 300 mm x 80 mm x 290 mm.
The indicator is now part of the South African Institute of Electrical Engineers historical collection and can be viewed in Observatory, Johannesburg, South Africa.

PORTABLE VOLTMETER

A PORTABLE DC VOLTMETER manufactured in England by Cambridge and Paul Instrument Company. Circa 1920 - 1924.

TECHNICAL DESCRIPTION

Portable, dual range, moving coil instrument for voltage measurement up to 25 millivolts DC.
Scaled 0 - 2,5 Mirror scale Direct connected Ranges 2,5 and 25 mV
Range selection by terminal connection Resistance 10 and 20 ohms at 20°C
The instrument is housed in a wooden case
Approximate dimensions 185mm x 180mm x 95mm

The voltmeter is now part of the South African Institute of Electrical Engineers historical collection and can be viewed in Observatory, Johannesburg, South Africa.​

PORTABLE LABORATORY OHM METER

A PORTABLE MULTI-RANGE LABORATORY OHMMETER believed to have been used in 1900. It measured resistance up to 1250 ohms. The manufacturer is unknown.

Scaled 0 – 125 (black) and 125 – 250 (red) Mirror scale
Ranges 0 – 125 ohms, 125 – 250 ohms, 0 – 250 ohms, 250 – 500 ohms, 0 – 625 ohms, 625 – 1250 ohms. Range selection by switches
External power supply 5 x 2V storage cells
A portable instrument in wooden case with carrying handle
Approximate overall dimensions 245mm x 150mm x 260mm
Operating instructions inside lid:-
Crank set on - 1: black figures or 2: red figures 1 Division = 5 Ohms
Crank set on - 3: black figures or 4: red figures 1 Division = 2 Ohms
Crank set on - 5: black figures or 6: red figures 1 Division = 1 Ohm​

VOLTAGE RATIO BOX

A VOLTAGE RATIO BOX manufactured by H Tinsley and Company, London. Circa 1930.

The 'volt box' or 'ratio box' is​ used in conjunction with a potentiometer if the voltage to be measured is above about 2V. It consists of a high resistance having a number of accurately placed tappings and performs the function of a potential divider.

TECHNICAL DESCRIPTION
Input resistance 10 000 ohms Multiplication factors 10/20/50/100/200/500
Approximate overall dimensions 250 mm x 190 mm x 180 mm
The voltage ratio box is now part of the South African Institute of Electrical Engineers historical collection and can be viewed in Observatory,   Johannesburg, South Africa

PORTABLE CURRENT TRANSFORMER

A PORTABLE CURRENT TRANSFORMER made by Ferranti Limited at Hollinwood, Lancashire, England. Circa 1910. The Victoria Falls and Transvaal Power Company Limited (VFP) was the original owner of the instrument.

Ratio 400/5A 7,5VA 50Hz Class AL Tested at 2000V With secondary shorting switch.

​A portable instrument in wooden case with leather carrying handle.
It is labelled "VF & TP Co., Ltd. Test Dept."
Approximate overall dimensions 225 mm x 220 mm x 270 mm.

The current transformer is now part of the South African Institute of Electrical Engineers historical collection and can be viewed in Observatory, Johannesburg, South Africa​

PORTABLE WATTMETER

AN AC/DC PORTABLE WATTMETER manufactured in the USA by Weston Electrical Instrument Company, Newark, New Jersey in 1920. It was standardized at Weston Laboratory, Audry House, Ely Place, London.

It is a portable, laboratory type, sub-standard, dynamometer instrument for measuring power in AC or DC circuits.

TECHNICAL DESCRIPTION
Scaled 0 – 120 watts AC/DC Mirror scale
Ranges: Current 2,5 and 5,0 A Potential 50 and 100 V
Power 0 – 120/240/480 W
Range selection by terminals and links Model 310
Portable instrument in wooden case with hinged removable cover
Approximate overall dimensions 210 mm x 270 mm x 150 mm
The wattmeter is now part of the South African Institute of Electrical Engineers 
historical collection and can be viewed in Observatory, Johannesburg, South Africa​.

A PORTABLE AC/DC WATTMETER made by Elliot Instruments, United Kingdom. Circa 1940.

It is a portable laboratory type, precision, dynamometer wattmeter, for measuring power in AC or DC circuits.

TECHNICAL DESCRIPTION
Scaled 0 – 110 Mirror scale
Ranges: 0 - 55W and 0 - 110W Range selection by terminals and links.
Max. voltage 110V Max. current 5A
Type PL
Correct at 68°F Accuracy % not readable
For use on a bench, the instrument has levelling screws and crossed spirit levels. It is mounted in a wooden case with a lid and carrying handle.
Approximate overall dimensions 215 mm x 280 mm x 240 mm
The instrument is now part of the South African Institute of Electrical Engineers historical collection and can be viewed in Observatory, Johannesburg, South Africa.​

PORTABLE LOW RESISTANCE OHMMETER

A PORTABLE LOW RESISTANCE OHMMETER
. Circa 1940. ESCOM’s Test Department is thought to have made the instrument.
The instrument was used to measure low resistance up to 1,8 ohms.
Range 0,1 – 1,8 ohms Detailed operating instructions are shown on the inside lid.
Approximate overall dimensions 295 mm x 240 mm x 170 mm
The instrument is now part of the South African Institute of Electrical Engineers historical collection and can be viewed in Observatory, Johannesburg, South Africa.​

PHASE SPLITTING RESISTANCE BOX​

A PHASE SPLITTING RESISTANCE BOX made by H Tinsley and Company, London. Circa 1930.

The Tinsley Phase Splitting Resistance consists of a variable number of non-inductively wound resistance coils. It is used in series with a variable capacitance to p​roduce the quadrature phase of a 2-phase Drysdale phase-shifter when the available supply is single phase. The Drysdale phase-shifter is an essential component of the Drysdale-Tinsley AC potentiometer used for the accurate measurement of alternating currents and voltages.​