Antique Scientific Instruments

V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London

V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London

V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London
V RARE LORD KELVIN'S PATENT ANTIQUE MULTICELLULAR VOLT METER GLASGOW & LONDON. OVERALL CONDITION IS GOOD, NOTHING IS BROKEN FROM WHAT I CAN SEE.

BRASS IS WORN AND WOULD BENEFIT FROM A POLISH. SOME WEAR AROUND THE WOOD, AGAIN HAS THE POTENTIAL TO LOOK AS IT ONCE DID. PLEASE BEAR IN MIND THIS ITEM IS AROUND 125 YEARS OLD AND A RARE OPPORTUNITY. PLEASE READ FURTHER ON FOR A MORE DESCRIPTIVE TEXT. TEXT TAKEN FROM THE PHYSICS MUSEUM.

Cylindrical brass case, mounted on square wooden base with three levelling screws. Circular 20 cm diameter bevelled glass at top showing silvered dial, horizontal quadrant scale. Non-linear paper-scale allowing readings up to 160 volts.

The scale which extends over 70o, is calibrated between 40 and 160 volts, and approximately linear between 60 and 100 volts. The moving element below has attached an aluminium pointer needle. Central brass suspension tube extends vertically from the glass. The tube is a modern replacement. A zeroing screw is found in the base, and two terminals, on the side of the brass case, one of which is labelled'CASE' and a shorting switch for discharge of quadrants.

A specially-shaped dumbell needle is rotated by electrostatic attraction to charged conducting quadrants, between which it is suspended. Opposite quadrants are connected to earth (one set), and the potential of the needle (other set), which is the voltage being measured. This causes a deflection of the needle proportional to the square of the difference in voltages of the quadrants - hence the non-linear scale. As the deflection is an even function of the voltage difference, i. Always in one direction, the voltmeter can be used for AC measurements.

Since no current flows through the device (the two terminals are isolated), the voltmeter is almost ideal. Practically all electrostatic voltmeters are founded on the types developed by Lord Kelvin. The voltmeters were first produced in 1888, and later models were able to measure voltages up to about 20,000 volts. This type of voltmeter was in use for laboratory of industrial measurements as late as 1922. This item is in the category "Antiques\Science/Medicine\Scientific Instruments".

The seller is "zaciboy" and is located in this country: GB. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Republic of, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, Korea, South, Switzerland, Taiwan, Thailand, Bangladesh, Bermuda, Bolivia, Barbados, Brunei Darussalam, Cayman Islands, Ecuador, Egypt, Guernsey, Gibraltar, Guadeloupe, French Guiana, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri Lanka, Macau, Monaco, Maldives, Martinique, Nicaragua, Oman, Pakistan, Peru, Paraguay, Reunion, Saudi Arabia, South Africa, United Arab Emirates, Chile, Bahamas, Colombia, Costa Rica, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, Trinidad and Tobago, Uruguay, Vietnam.

  • Antique: Yes
  • Type: Volt Meter
  • Material: Brass


V Rare Lord Kelvin's Patent Antique Multicellular Volt Meter Glasgow & London