  A procedure to measure the magnetic field inside the CMS yoke elements is
considered. Fast discharge of the CMS coil can be used to induce voltages in
flux loops installed around selected elements of the CMS yoke. By sampling the
voltage induced in any one loop, and integrating the voltage waveform over the
time of the discharge, the total initial flux in the loop can be measured. The
average value of the magnetic field in the yoke element normal to the plane of
the flux loop is obtained by dividing the measured value of the flux by the
known area enclosed by the loop and the number of turns in the loop.
