  In this paper the techniques available to make and calibrate magnetic search
coils are reviewed, with emphasis on harmonic coil systems as the commonly-used
optimal choice for integral measurements of accelerator magnets in terms of
measuring range, accuracy, and cost. The topics treated, drawing extensively on
half a century of experience at CERN, include mechanical and electrical design
criteria, practical fabrication techniques, metrological considerations, and
various calibration methods for coil parameters such as surface area, rotation
radius, tilt angle etc. in both static or time-varying magnetic fields.
