Proceedings of A Symposium by J.D. McGee and W.L. Wilcock (Eds.)

By J.D. McGee and W.L. Wilcock (Eds.)

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The vacuum device into which the tube is installed for operation consists of two chambers, one surrounding the membrane-end of the tube and the other providing a place to load and unload photographic plates without interrupting the maintenance of a protective vacuum behind the barrier-membrane. The operating procedure is as follows: a phofographic plate is placed in the loading chamber, which is then evacuated; this requires only about one minute. The gate between the loading chamber and the tube-mounting chamber is then opened and the photographic plate is transported into place just behind the barrier-membrane.

Our experimental system was equipped with more vacuum apparatus than should be needed if barrier-membrane techniques were put into regular use. Naval Observatory in Washington and on the 40-inch reflector of the Naval Observatory Station a t Flagstaff, Arizona. Images produced by the converter tubes were compared with those recorded by ordinary direct photography. The results were reduced to terms of signal-to-noise performance by making microphotometer tracings of the images. The effectiveness of barrier-membranes can be judged from Fig.

B. ZACHAROV: It is difficult to say whether our tubes will produce one developablr grain for each photoelectron. Because of the finite thicknesses of the phosphor screen and mica end window, most of the excited photons will not strike the same grain. However, with a sufficiently thin end window and phosphor screen, I would agree that there is a high probability of a developable grain being produced. E. F. DE HAAN: What is the loss in definition due to the fact that the mica window is curved? R.

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