Consideration is given to answering the application engineer's questions regarding the relative importance of fiber size, extra mural absorbing material, numerical aperture, geometry, and general cost effectiveness of fiber optic plates when used in a cathode ray tube. Also described is a concise description of the various deficiencies of typical fiber optic products, the distortions, blemishes and their impact upon system performance. One example of a successful combination of fiber optics and a miniature cathode ray tube is described in detail.

Proctoscopes have long been the conventional device for examining the lower intestine for carcinoma, polyps and other disorders. Their inflexible design has restricted examinations at best up to 20 to 25 cms. A manipulable, flexible fiber optic instrument has been developed which allows up to 55 cms of the lower intestinal tract to be examined without the need of surgery. The development of the fibersigmoidoscope and its use in examining patients in addition to other diagnostic instruments using synthetic fiber optics will be discussed. This work is under development through Health, Education and Welfare with Dr. B. G. Overholt, of the University of Michigan.

A new cinedensitometer has been developed specifically for the purpose of extracting densitometric data from 16 mm motion picture films. By means of a tracking mirror arrangement, the film density of a moving image can be measured dynamically as the film is being projected in a cine mode. Two photo-electric detectors along with various remote controlled aperture wheels are mounted behind the projection screen to measure image and back-ground densities simultaneously. Overall readout is precise to about ± .03 density units.

"1 have been particularly impressed with the technical level of the meeting. - The whole community has been here, at least the whole U. S. community, and several foreign guests. I don't believe it has ever happened like this before and the general level of interest has produced a more homogeneous symposium than usual. - - - It has also stimu-lated me to sit quietly and think a little bit that some of us, at least, should not get so close to the attempts to build better equipment that we stop looking around for some other unthought-of basic trick, some basic principle that hasn't been tapped."