Solar Instruments.- I. Instruments for the measurement of the total solar radiation.- II. Radio telescopes.- III. The image-forming instruments of solar astronomy.- IV. Construction and housing of solar telescopes.- V. Auxiliary instruments for solar telescopes.- VI. Instruments for the observation of solar eclipses.- VII. Some instrumental problems of solar observation.- Radio Astronomy Techniques.- I. Introduction.- II. Receivers.- a) Principal receiver parameters.- b) Monochromatic operation of a noise-free receiver.- c) Reception of a continuous spectrum.- d) Statistical limit to precision.- e) Calibration.- f) Sensitivity to weak signals.- g) Comparison systems.- h) The Ryle and Vonberg system.- III. Aerials.- a) Aerial parameters.- b) Radiation patterns.- c) Types of aerial.- d) Feeders.- e) Tolerances.- f) Mountings and drive systems.- IV. Theory of aerial smoothing.- V. Interferometers.- a) Two-element interferometers.- b) Multi-element interferometers.- VI. Observing procedures and analysis of observations.- a) Discrete sources.- b) Extended sources.- c) Restoration.- Photographic Photometry.- I. Preliminary remarks.- II. Observing materials.- III. Measuring instruments.- IV. Some properties of photographic star images.- V. Image-form factors.- VI. Chromatic factors.- VII. Atmospheric extinction.- VIII. Photometric systems.- IX. Establishment of a fundamental magnitude scale by photography.- X. Scale and zero-point transfers.- XI. Photography as a method of photometric interpolation.- XII. Determination of color indices.- XIII. Quantitative classification photometry.- XIV. Qualitative classification photometry.- La nature de la surf ace des planètes et de la Lune.- I. La Lune.- a) Structure microscopique de la surface lunaire.- b) Structure télescopique de la surface de la Lune.- c) Conclusion.- II. La Planète Mercure.- III. Les astéroïdes.- IV. Les satellites de Jupiter.- V. La Planète Mars.- VI. Conclusion.- Photoelectric Techniques.- I. Introduction.- II. Photoelectric detectors of radiation.- III. Amplifying and indicating instruments.- IV. The photometer on the telescope.- V. Photoelectric spectrophotometry.- VI. Electron image tubes.- General references.- Sachverzeichnis (Deutsch-Englisch).- Subject Index (English-German).- Table des matières (Français).