General Electric In 1922, Schaefer's parents asked him to leave high school and go to work to supplement the family income. On the advice of his maternal uncles, Schaefer joined a four-year apprentice machinist course at
General Electric. During the second year of his apprenticeship, Schaefer was granted a one-month leave to accompany Dr.
Arthur C. Parker, New York State Archaeologist, on an expedition to central New York. As Schaefer was concluding the apprentice course in 1926 he was assigned to work at the machine shop at the General Electric Research Laboratory, where he worked for a year as a journeyman toolmaker. Somewhat discouraged by the work of a toolmaker, Schaefer sought to satisfy a desire to work outdoors and to travel by joining, initially through a correspondence course, the Davey Institute of Tree Surgery in
Kent, Ohio, in 1927. After a brief period working in Michigan, Schaefer asked to be transferred back to the Schenectady area and for a while worked as an independent landscape gardener. Upon the advice of Robert Palmer, Superintendent of the GE Research Laboratory, in 1929 Schaefer declined an opportunity to enter into a partnership for a plant nursery and instead rejoined the machine shop at the Research Laboratory, this time as a model maker. At the Research Laboratory machine shop, Schaefer built equipment for Langmuir and his research associate,
Katharine B. Blodgett. In 1932, Langmuir asked Schaefer to become his research assistant. Schaefer accepted and in 1933 began his research work with Langmuir, Blodgett, Whitney, and others at the Research Lab and throughout the General Electric organization. With Langmuir, Blodgett and others as well as by himself, Schaefer published many reports on the areas he studied, which included surface chemistry techniques, electron microscope techniques, polarization, the affinity of ice for various surfaces, protein and other monolayers, studies of protein films, television tube brightness, and
submicroscopic particulates. An example of Scaefer's lasting contribution to surface science is the description in 1938 of a technique developed by him and Langmuir (later known as the Langmuir
–Schaefer method) for the controlled transfer of a monolayer to a substrate, a modification of the
Langmuir–Blodgett method. After his promotion to research associate in 1938, Schaefer continued to work closely with Langmuir on the many projects Langmuir obtained through his involvement on national advisory committees, particularly related to military matters in the years immediately before and during the Second World War. This work included research on gas mask filtration of smokes, submarine detection with binaural sound, and the formation of artificial fogs using smoke generators—a project which reached fruition at Vrooman's Nose in the Schoharie Valley with a demonstration for military observers. During his years as Langmuir's assistant, Langmuir allowed and encouraged Schaefer to carry on his own research projects. As an example of this, in 1940, Schaefer became known in his own right for the development of a method to make replicas of individual snowflakes using a thin plastic coating. This discovery brought him national publicity in popular magazines and an abundance of correspondence from individuals, including many students, seeking to replicate his procedure. In 1943, the focus of Schaefer's and Langmuir's research shifted to precipitation static, aircraft icing, ice nuclei, and cloud physics, and many of their experiments were carried out at
Mount Washington Observatory in
New Hampshire. In the summer of 1946, Schaefer found his experimental "cold box" too warm for some laboratory tests he wanted to perform. Determined to get on with his work, he located some "dry ice" (solid CO2) and placed it into the bottom of the "cold box." Creating a cloud with his breath he observed a sudden and heretofore unseen bluish haze that suddenly turned into millions of microscopic ice crystals that dazzled him in the strobe lit chamber. He had stumbled onto the very principle that was hidden in all previous experiments—the stimulating effect of a sudden change in heat/cold, humidity, in supercooled water spontaneously producing billions of ice nuclei. Through scores of repeated experiments he quickly developed a method to "seed" supercooled clouds with dry ice. In November 1946, Schaefer conducted a successful field test seeding a natural cloud by airplane—with dramatic ice and snow effect. The resulting publicity brought an abundance of new correspondence, this time from people and businesses making requests for snow and water as well as scientists around the world also working on weather modification to change local weather conditions for the better. Schaefer's discovery also led to debates over the appropriateness of tampering with nature through cloud seeding. In addition, the successful field test enabled Langmuir to obtain federal funding to support additional research in cloud seeding and weather modification by the GE Research Laboratory. Schaefer was coordinator of the laboratory portion of Project Cirrus while the Air Force and Navy supplied the aircraft and pilots to carry out field tests and to collect the data used at the Research Laboratory. Field tests were conducted in the Schenectady area as well as in Puerto Rico and New Mexico. When the military pilots working on
Project Cirrus were assigned to duties in connection with the Korean War, GE recommended that Project Cirrus be discontinued after comprehensive reports were prepared of the project and the discoveries made. The final Project Cirrus report was issued in March 1953.
Munitalp Foundation While Project Cirrus was winding down, Schaefer was approached by Vernon Crudge on behalf of the trustees of the Munitalp Foundation to work on Munitalp's meteorological research program. For a time, Schaefer worked for both the Research Laboratory and Munitalp, and in 1954 he left the Research Laboratory to become the Director of Research of Munitalp. At Munitalp, Schaefer worked with the U.S. Forest Service at the Priest River Experimental Forest in northern Idaho with Harry T. Gisborne, noted fire researcher, on Project Skyfire, a program to determine the uses of cloud seeding to affect the patterns of lightning in thunderstorms (and the resulting forest fires started by lightning). Project Skyfire had its roots in an association between the Forest Service and Schaefer begun in the early days of Project Cirrus. While at Munitalp Schaefer also worked on developing a mobile atmospheric research laboratory and time-lapse films of clouds. Schaefer left Munitalp in 1958, turning down an offer to move with the Foundation to Kenya, but he remained an adviser to Munitalp for several years after that.
Scientific education After leaving Munitalp, Schaefer's career turned towards scientific education, and let him put his belief in the power of experimentation and observation over book-learning into practice. He worked with the
American Meteorological Society and Natural Science Foundation on an educational film program and to develop the Natural Sciences Institute summer programs which gave high school students the opportunity to work with scientists and on their own to do field research and experimentation. From 1959 to 1961, Schaefer was director of the Atmospheric Science Center at the
Loomis School in Connecticut. During the 1970s, he organized and led annual winter expeditions for 8-10 research scientists to Yellowstone National Park where massive amounts of supercooled clouds were produced by the many geysers, including Old Faithful. There at negative 20-50 Fahrenheit conditions enabled the assembled researchers to perform numerous experiments using dry ice, silver iodide to convert the supercooled water to ice crystals at ground level. Temperature and ice crystal formations allowed first-hand observation of the full range of halo and corona optical effects.
Atmospheric Sciences Research Center (ASRC), University at Albany, State University of New York From 1962 to 1968, the NSI program was continued with Schaefer's directorship under the auspices of the Atmospheric Sciences Research Center (ASRC) at the State University of New York at Albany (as the
University at Albany, State University of New York was then known). During this period, Schaefer also continued his consulting work for many companies, government agencies, and universities. These consulting activities spanned most of Schaefer's career, and extended beyond his retirement from ASRC in 1976. Schaefer helped found ASRC in 1960 and served as its Director of Research until 1966 when he became Director. Schaefer brought highly qualified atmospheric science researchers to ASRC, many of whom he had met through his work at GE and Munitalp.
Bernard Vonnegut, Raymond Falconer and Duncan Blanchard were all veterans of Project Cirrus who joined Schaefer at ASRC. During his years at ASRC, in addition to the NSI summer programs, Schaefer led annual research expeditions to Yellowstone National Park for atmospheric scientists to work in the outdoor laboratory it provided each January. In the 1970s, Schaefer's own research interests focused on
solar energy, aerosols, gases, air quality, and pollution particles in the atmosphere. His work in some of these areas culminated in a three-part report on Air Quality on the Global Scale in 1978. In addition, during the 1970s, Schaefer was an instructor in the American Association for the Advancement of Science
Chautauqua short courses for science teachers. ==Publications (selected) ==