Abstract
The image tube system is designed to take advantage of the good features of P829D tube but to minimize the effect of the some limitations. A high gain transmission secondary emission (TSE) image tube has been in use for some time at Kitt Peak as an aid in obtaining astronomical spectra. A second, rather different application of the TSE tube is to study of interstellar lines in the spectra of early type stars. This tube, like most image tubes, has its strong points and limitations. The image tube system is designed to take advantage of the good features of this tube but to minimize the effect of the first three limitations. The system in use at low dispersion on the 84-in. spectrograph is identical to the system described in the chapter except that the incident spectrum is very narrow and the cylindrical lens is not needed. Figures are given in the chapter to illustrate several aspects of the low dispersion spectra.
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