Measurement of Weissenberg films with a computer-controlled drum microdensitometer

A set of Fortran programs has been written for the on-line measurement of Weissenberg films with a rotating-drum microdensitometer, interfaced to a small computer. The minimum memory capacity required is 8K 16-bit words, but the evaluation speed can be increased from about 10 to about 30 reflexions/min if a 12K or 16K memory is used. The crystal structures determined from data obtained with the system have refined to R = (Σ|F_o − |F_c || /ΣF_o) values of 0.06–0.07.