Jan-7th-2009
Proportionate Arms
In general terms the arms of a Wheatstone bridge
whose proportion has to be known to complete the measurement. There is a
different system of naming them. Some designate by this title the two
arms in parallel with each other branching at and running from one end
of the bridge to the two galvanometer connections. In the cut of the Box
Bridge, A C and A B are the proportionate arms. The third arm is then
termed the Rheostat arm. (Stewart & Gee.)
Others treat as proportionate arms the two side members of the bridge in
parallel with the unknown resistance and third or rheostat arm.
Synonym–Ratio Arms
