Contains research objectives.Joint Services Electronics Programs (U. S. Army, U. S. Navy, and U. S. Air Force) under Contract DA 36-039-AMC-03200(E

Edgerton, Harold E.

Contains research objectives.Joint Services Electronics Programs (U. S. Army, U.S. Navy, and U.S. Air Force) under Contract DA 28-043-AMC-02536(E

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XXXVI. STROBOSCOPIC LIGHT RESEARCH*Academic and Research StaffProf. H. E. EdgertonRESEARCH OBJECTIVESThe Research Laboratory of Electronics has had close association with the researchand application of electronic flash-lighting equipment work that is being carried out inthe Stroboscopic Light Laboratory of the Department of Electrical Engineering. Thereare mutual advantages because of common goals in many areas of interest.First, the aim of both is the education of students. Every opportunity for experi-mental work should be given to students at the Massachusetts Institute of Technologyso that they can become acquainted with the real experimental world and learn the satis-faction of accomplishment. The laboratories and facilities of the Research Laboratoryof Electronics are excellent, especially the shops and general service laboratories. Asan example, each term, several classes of my students are shown the glass-blowingfacilities. Actual devices such as discharge lamps are made during these visits, andthe students are given the lamps to exhaust and operate in actual circuits.Second, the research goal of the Stroboscopic Light Laboratory is the developmentof instruments and methods by using electronic flash light sources involving the electri-cal excitation of gas. This field - gaseous conduction of electricity - has engaged theattention of many of the research workers at the Research Laboratory of Electronics.There is much more to be accomplished in the transient pulsing of electricity throughgases, so we hope for many years of cooperation.In our laboratory we wish to know more and more about the fundamental processesthat exist in flash lamps so that brighter, shorter-flash or special lamps can be per-fected. As knowledge of the physical mechanism evolves, perhaps new goals, at pres-ent unperceived, can be reached.We are called upon from many departments of M. I. T. to help in making measure-ments for a great variety of problems, mainly involving things that happen fast. Muchof our effort is expended along this line of application. Once in a while, a difficulttechnical problem is easily and quickly solved; more than likely, it is not. A host ofproblems is waiting for new solutions. This, too, makes it interesting.For more than ten years we have worked on many applications of electronic flash-lighting equipment to underwater research, with partial financial help from the NationalGeographic Society and interested individuals. This work has been greatly stimulatedby the addition of a pressure-testing facility in Room 2OD-009. We have assisted withthe photographic devices for both existing bathyscaphes, and helped with the design ofnew photographic equipment for the French bathyscaphe (ARCHIMEDE) that was builtfor ultimate depths of 37, 000 feet.At present, two photographic problems in the sea engage our attention. One involvesthe photography of small jellylike creatures that are almost invisible because theirrefractive index resembles that of water. A camera equipped with a back light with aspecial strobe will be made to test the use of the back-lighting principle. This equip-ment will be used at depths down to 1 mile in seas where abundant plankton life is found.A second problem, also involving electronic flash photography, is an attempt toapply the elapsed-time principle of motion-picture photography to the study of shallowareas of the sea bottom. For this purpose, stationary cameras will be placed on thebottom of the sea for extended periods of time to study tidal action and biologicalchanges with the seasons.H. E. EdgertonThis work is supported in part by the Joint Services Electronics Programs (U. S.Army, U. S. Navy, and U. S. Air Force) under Contract DA 28-043-AMC-02536(E).QPR No. 88 351

Stroboscopic Light Research

XXXIII. STROBOSCOPIC LIGHT RESEARCHAcademic and Research StaffProf. H. E. EdgertonGraduate StudentsD. S. GuttmanRESEARCH OBJECTIVESThe Research Laboratory of Electronics has had close association with the researchand application of electronic flash-lighting equipment work that is being carried out inthe Stroboscopic Light Laboratory of the Department of Electrical Engineering. Thereare mutual advantages because of common goals in many areas of interest.First, the aim of both is the education of students. Every opportunity for experi-mental work should be given to students at the Massachusetts Institute of Technologyso that they can become acquainted with the real experimental world and learn the satis-faction of accomplishment. The laboratories and facilities of the Research Laboratoryof Electronics are excellent, especially the shops and general service laboratories. Asan example, each term, several classes of my students are shown the glass-blowingfacilities. Actual devices such as discharge lamps are made during these visits, andthe students are given the lamps to exhaust and operate in actual circuits.Second, the research goal of the Stroboscopic Light Laboratory is the developmentof instruments and methods by using electronic flash light sources involving the electri-cal excitation of gas. This field - gaseous conduction of electricity - has engaged theattention of many of the research workers at the Research Laboratory of Electronics.There is much more to be accomplished in the transient pulsing of electricity throughgases, so we hope for many years of cooperation.In our laboratory we wish to know more and more about the fundamental processesthat exist in flash lamps so that brighter, shorter-flash or special lamps can be per-fected. As knowledge of the physical mechanism evolves, perhaps new goals, at pre-sent unperceived, can be reached.We are called upon from many departments of M. I. T. to help in making measure-ments for a great variety of problems, mainly involving things that happen fast. Muchof our effort is expended along this line of application. Once in a while, a difficulttechnical problem is easily and quickly solved; more than likely, it is not. A host ofproblems is waiting for new solutions. This, too, makes it interesting.For more than ten years we have worked on many applications of electronic flash-lighting equipment to underwater research, with partial financial help from the NationalGeographic Society and interested individuals. This work has been greatly stimulatedby the addition of a pressure-testing facility in Room 20D-009. We have assisted withthe photographic devices for both existing bathyscaphes, and helped with the design ofnew photographic equipment for the French bathyscaphe (ARCHIMEDE) that was builtfor ultimate depths of 37, 000 feet.At present, two photographic problems in the sea engage our attention. One involvesthe photography of small jellylike creatures that are almost invisible because theirrefractive index resembles that of water. A camera equipped with a back light with aspecial strobe will be made to test the use of the back-lighting principle. This equip-ment will be used at depths down to 1 mile in seas where abundant plankton life is found.This work is supported by the Joint Services Electronics Programs (U. S. Army,U. S. Navy, and U. S. Air Force) under Contract DA 36-039-AMC-03200(E).QPR No. 80 271(XXXIII. STROBOSCOPIC LIGHT RESEARCH)A second problem, also involving electronic flash photography, is an attempt toapply the elapsed-time principle of motion-picture photography to the study of shallowareas of the sea bottom. For this purpose, stationary cameras will be placed on thebottom of the sea for extended periods of time to study tidal action and biologicalchanges with the seasons.H. E. EdgertonQPR No. 80 272

Contains research objectives.Joint Services Electronics Programs (U. S. Army, U.S. Navy, and U. S. Air Force) under Contract DA 28-043-AMC-02536(E

XXIX. STROBOSCOPIC LIGHT RESEARCHAcademic Research StaffProf. H. E. EdgertonRESEARCH OBJECTIVESThe Research Laboratory of Electronics has had close association with the researchand application of electronic flash-lighting equipment work that is being carried out inthe Stroboscopic Light Laboratory of the Department of Electrical Engineering. Thereare mutual advantages because of common goals in many areas of interest.First, the aim of both is the education of students. Every opportunity for experi-mental work should be given to students at the Massachusetts Institute of Technologyso that they can become acquainted with the real experimental world and learn the satis-faction of accomplishment. The laboratories and facilities of the Research Laboratoryof Electronics are excellent, especially the shops and general service laboratories. Asan example, each term, several classes of my students are shown the glass-blowingfacilities. Actual devices such as discharge lamps are made during these visits, andthe students are given the lamps to exhaust and operate in actual circuits.Second, the research goal of the Stroboscopic Light Laboratory is the developmentof instruments and methods by using electronic flash light sources involving the electri-cal excitation of gas. This field - gaseous conduction of electricity - has engaged theattention of many of the research workers at the Research Laboratory of Electronics.There is much more to be accomplished in the transient pulsing of electricity throughgases, so we hope for many years of cooperation.In our laboratory we wish to know more and more about the fundamental processesthat exist in flash lamps so that brighter, shorter-flash or special lamps can be per-fected. As knowledge of the physical mechanism evolves, perhaps new goals, at pres-ent unperceived, can be reached.We are called upon from many departments of M. I. T. to help in making measure-ments for a great variety of problems, mainly involving things that happen fast. Muchof our effort is expended along this line of application. Once in a while, a difficulttechnical problem is easily and quickly solved; more than likely, it is not. A host ofproblems is waiting for new solutions. This, too, makes it interesting.For more than ten years we have worked on many applications of electronic flash-lighting equipment to underwater research, with partial financial help from the NationalGeographic Society and interested individuals. This work has been greatly stimulatedby the addition of a pressure-testing facility in Room 20D-009. We have assisted withthe photographic devices for both existing bathyscaphes, and helped with the design ofnew photographic equipment for the French bathyscaphe (ARCHIMEDE) that was builtfor ultimate depths of 37, 000 feet.At present, two photographic problems in the sea engage our attention. One involvesthe photography of small jellylike creatures that are almost invisible because theirrefractive index resembles that of water. A camera equipped with a back light with aspecial strobe will be made to test the use of the back-lighting principle. This equip-ment will be used at depths down to 1 mile in seas where abundant plankton life is found.A second problem, also involving electronic flash photography, is an attempt toapply the elapsed-time principle of motion-picture photography to the study of shallowareas of the sea bottom. For this purpose, stationary cameras will be placed on thebottom of the sea for extended periods of time to study tidal action and biologicalchanges with the seasons.H. E. Edgerton.This work is supported in part by the Joint Services Electronics Programs (U. S.Army, U. S. Navy, and U. S. Air Force) under Contract DA 28-043-AMC-02536(E).QPR No. 92 451

Contains research objectives.Joint Services Electronics Programs (U. S. Army, U.S. Navy, and U.S. Air Force) under Contract DA 36-039-AMC-03200(E

XXXV. STROBOSCOPIC LIGHT RESEARCHAcademic and Research StaffProf. H. E. EdgertonRESEARCH OBJECTIVESThe Research Laboratory of Electronics has had close association with the researchand application of electronic flash-lighting equipment work that is being carried out inthe Stroboscopic Light Laboratory of the Department of Electrical Engineering. Thereare mutual advantages because of common goals in many areas of interest.First, the aim of both is the education of students. Every opportunity for experi-mental work should be given to students at the Massachusetts Institute of Technologyso that they can become acquainted with the real experimental world and learn the satis-faction of accomplishment. The laboratories and facilities of the Research Laboratoryof Electronics are excellent, especially the shops and general service laboratories. Asan example, each term, several classes of my students are shown the glass-blowingfacilities. Actual devices such as discharge lamps are made during these visits, andthe students are given the lamps to exhaust and operate in actual circuits.Second, the research goal of the Stroboscopic Light Laboratory is the developmentof instruments and methods by using electronic flash light sources involving the electri-cal excitation of gas. This field - gaseous conduction of electricity - has engaged theattention of many of the research workers at the Research Laboratory of Electronics.There is much more to be accomplished in the transient pulsing of electricity throughgases, so we hope for many years of cooperation.In our laboratory we wish to know more and more about the fundamental processesthat exist in flash lamps so that brighter, shorter-flash or special lamps can be per-fected. As knowledge of the physical mechanism evolves, perhaps new goals, at pres-ent unperceived, can be reached.We are called upon from many departments of M.I.T. to help in making measure-ments for a great variety of problems, mainly involving things that happen fast. Muchof our effort is expended along this line of application. Once in a while, a difficulttechnical problem is easily and quickly solved; more than likely, it is not. A host ofproblems is waiting for new solutions. This, too, makes it interesting.For more than ten years we have worked on many applications of electronic flash-lighting equipment to underwater research, with partial financial help from the NationalGeographic Society and interested individuals. This work has been greatly stimulatedby the addition of a pressure-testing facility in Room 20D-009. We have assisted withthe photographic devices for both existing bathyscaphes, and helped with the design ofnew photographic equipment for the French bathyscaphe (ARCHIMEDE) that was builtfor ultimate depths of 37, 000 feet.At present, two photographic problems in the sea engage our attention. One involvesthe photography of small jellylike creatures that are almost invisible because theirrefractive index resembles that of water. A camera equipped with a back light with aspecial strobe will be made to test the use of the back-lighting principle. This equip-ment will be used at depths down to 1 mile in seas where abundant plankton life is found.A second problem, also involving electronic flash photography, is an attempt toapply the elapsed-time principle of motion-picture photography to the study of shallowareas of the sea bottom. For this purpose, stationary cameras will be placed on thebottom of the sea for extended periods of time to study tidal action and biologicalchanges with the seasons.H. E. EdgertonThis work is supported in part by the Joint Services Electronics Programs (U.S.Army, U.S. Navy, and U.S. Air Force) under Contract DA 36-039-AMC-03200(E).QPR No. 84 363I

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Stroboscopic Light Research

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