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Construction Of Meter Bridge In Our Laboratory
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1.1 Historical Background
The
discovery of the meter bridge was as a result of the modification of
the Wheatstone bridge. Thus, the working of meter bridge is based on the
principle of what stone bridge. It is well known that the first user of
the bridge circuit was Samuel Hunter Christie in 1833 (Thomas, 2005).
Wheatstone acknowledge this in his Bakerian lecture. For many years it
has been assumed that Christie was the son of William Christie of the
eponymous auction house, but recently it has become clear that he was
the son of a different William Christie.
Without the presence of a
standard cell, the bridges can not work or produce results. The original
design of a standard cell is due to the british engineer Latimer clark,
Ca. 1878. The idea, according to Thomas (2005) was to make a
reproducible standard of EMF that could be used for positional work in
electricity. The original design used zinc and mercury electrodes
immersed in zinc and mercury sulphate. The English-America inventor and
electrician, Edward Weston (1850 – 1936), patented an improved standard
cell in 1893 that replaces zinc with cadmium. This cell’s EMF changed
very little with temperature, and it had a characteristic EMF of 1.0183V
at 200C.
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ABSRACT - [ Total Page(s): 1 ]The working of a meter bridge is based on the principle of Wheatstone bridge. It uses two resistances instead of four resistances obtainable in a Wheatstone bridge. The construction of the meter bridge was simply the selection, assembling and wiring of the components, by following the circuit diagram, into the find piece. The constructed bridge is tested and demonstrated to find the value of unknown resistance. One good thing about meter bridge is that, it is simple and more accurate than Wheats ... Continue reading---
