Biomechanics Cinematography And High Speed Photography

Under the title The Coordination and Regulation of Movements, an English language version of six of the most important papers of the Russian physiologist Nicholas Bernstein was published in 1967 (Pergamon Press Ltd.). That work has been out of print for some years, but in view of the frequency of its citation in recent works on movement control, a republication was considered desirable. However, since some of the papers in the first edition were written in the 1930's, it was felt that readers' interests would be better served if, after each chapter, an evaluation of the work and, where necessary, an update of the data in the light of more recent findings was included. Contributors of international renown provide such chapters.

The combination of color schlieren with high speed flash techniques has proved to be a valuable tool for investigating high speed transient events. Fully two dimensional refractive index information can be ob tained. The resolution on 35 mm film was sharp enough to allow 50 cm by 75 cm color enlargements. REFERENCES 1. Barnes, N.F., Jour. of the SMPTE, Oct. 1953, Vol. 61,487-511. 2. Cords, P.R., S.P.I.E. Jour., February-March 1968, Vol. 6. 3. North, R.J., NPL/Aero/266, 1954. 4. Settles, G.S., Image Technology, June-July 1972. 5. Smith, L.L., and J.R. Waddell, 9th Congress of Righ Speed Photogra phy, Denver, Colo., August 1970, Paper 86. 6. Stong, C.L., and G.S. Settles, Scientific American, May 1971, Vol. 225, No.5. 7. Stong, C.L., and Vandiver, J.K., Scientific American, August 1974, Vol. 231, No.2. ,105 DISCUSSION MY' R J North, (UK): Pould the author care to comment on possible ambiguities of interpretation due to the omnidirectional sensitivity of the colour filter system used? I notice that in two of his pic tures density gradients in directions at right angles are shown by the same colour transitions. MY' J Kim Vandiver: The photographs presented were not composed to yield accurate determination of the direction of density gradients.