L. NORD SCHWEIBERT, 65, a retired vice president of the Sheraton Hotel Corp. who lived in the Washington area from 1959 to 1979, died Jan. 28 at St. Agnes Hospital in Baltimore. He had cancer.

Mr. Schweibert, who was a resident of Berlin, Md., was born in Boise, Idaho. He graduated from the University of Washington in Seattle. During World War II, he served in the Navy in the Pacific.

He went to work for the Sheraton Hotel in French Lick, Ind., in 1952. He transferred to the Washington area in 1959 and became the general manager of the Sheraton-Washington Hotel, which was built according to his plans.

In 1979, Mr. Schweibert was transferred to Hawaii, where he became a senior vice president with Sheraton. He retired in 1983 and moved to Berlin.

He was president of the Washington Hotel Association for three terms. He had been a member of the Washington Convention and Visitors Association, the Metropolitan Washington Board of Trade, and SKAL, a hotel industry organization. He also was a member of the Columbia Country Club.

His marriage to Margaret Schweibert ended in divorce.

Survivors include his wife, Marguerite Schweibert of Berlin; two daughters by his first marriage, Margaret Leslie Suarez of Rockville, and Elizabeth Anne Schweibert of Princeville, Hawaii; three stepsons, Dennis Foster of Timonium, Md., Jonathan Foster of New Brunswick, N.J., and Mark Foster of Baltimore; one brother, Erwin Schweibert of Caldwell, Idaho, and three grandchildren.

FREDERICK S. BRACKETT, 91, a retired chief of the photobiology section of the Laboratory of Physical Biology at the National Institutes of Health, died of cardiopulmonary arrest Jan. 28 at his home in Rockville.

Dr. Brackett was born in Claremont, Calif. He graduated from Pomona College and received a doctorate in physics from Johns Hopkins University. He taught physics at the University of California at Berkeley before moving to the Washington area in 1927.

He joined the Department of Agriculture's Fixed Nitrogen Laboratory in 1927 and transferred in 1936 to the National Institutes of Health, where he became chief of the photobiology section of the physical biology laboratory.

During World War II, he served in the Army, where he directed a research optics program and developed vision and fire control equipment for combat vehicles. He was promoted to the rank of lieutenant colonel and received the Legion of Merit for his work.

After the war, Dr. Brackett returned to NIH as chief of the photobiology section. He later helped introduce the use of advanced computer technology at NIH through his work in designing and interfacing early computers with other instruments. He retired in 1961.

He was a member of the American Physical Society and the Optical Society of America. He also had been elected to the Academy of Medicine of Washington, D.C.

Survivors include his wife of 69 years, Agnes L. Brackett of Rockville; two daughters, Lucille B. Streets of Las Cruces, N.M., and Marian B. Titus of Ann Arbor, Mich.; four grandchildren, and four great-grandchildren.

ROBERT MITCHELL GAYNOR, 77, a retired Army brigadier general and former Central Intelligence Agency organizational executive, died of cancer Jan. 29 at Arlington Hospital. He lived in Arlington.

He worked for the CIA from 1947 until retiring in 1971. During those years, he had been an administrator in its honors and awards programs. He had served on active Army duty from 1939 to 1947, retiring with the rank of colonel. He was advanced to brigadier general on the retired list of the Pennsylvania National Guard.

Gen. Gaynor was a native of Scranton, Pa., and a 1938 graduate of the University of Scranton. During World War II, he earned the Distinguished Service Cross, the Army's highest award for valor after the Medal of Honor, while serving as a regimental intelligence officer with the 28th Infantry division in France. His other decorations included two Bronze Stars and two Purple Hearts, as well as the Combat Infantryman's Badge.

He was a past national adjutant of the Legion of Valor, a group composed of winners of high military decorations for valor. He also had served as the Legion's national historian and as publisher of its General Orders magazine.

From 1975 to 1977, he was president of the Central Intelligence Retirees Association. Gen. Gaynor was a member of St. Thomas More Catholic Church in Arlington, the Retired Officers Association, the National Rifle Association and the Society of the 28th Division.

His wife of 41 years, the former Margaret M. Jennings, died in 1982. Survivors include a son, Army Maj. Robert Jr., of Fayetteville, N.C.; three daughters, Margaret K. Gaynor of Fargo, N.D., Mary J. Gaynor of New York City, and Barbara A. Aziz of Tucson, and two grandchildren.

DAVID E. BUCK SR., 65, a retired area civil engineer and real estate salesman who was a member of St. Mark's Catholic Church in Hyattsville, died of cancer Jan. 30 at his home in University Park.

He was an engineer with the old Inter-County Construction Corp. here for about 20 years before retiring in 1982. During those years, he had worked on underwater pipeline projects in this area, Richmond and Baltimore. He also had been project engineer of a House office building subway construction project and chief engineer and supervisor on a Sousa Bridge project.

Mr. Buck was an engineering consultant in 1982 and 1983. Later in 1983, he joined the old Hugh T. Peck real estate concern in Langley Park, and was awarded its "rookie of the year" award in 1984. In the summer of 1987, he retired from what had become the Lewis & Silverman real estate company.

An area resident since 1960, he was a native of Norfolk. He attended the University of Virginia and served with the Army in Europe during World War II.

Survivors include his wife, Mary Iorantha Tobin (Io) Buck of University Park; two daughters, Mary Ellen Harding of Silver Spring, and Mary Isabel Buck of University Park; six sons, Joseph Tobin Buck of San Jose; David Jr., of Margate, Fla.; Thomas Francis Buck of Hyattsville, and James Lee, Philip Paul and Michael Adrian Buck, all of University Park; a brother, C. Warren Buck of King of Prussia, Pa.; seven sisters, Mary Lee Schaefer of Stone Mountain, Ga.; Nina Browder of Martinsburg, W.Va.; Rita Buck and Janet Dailey, both of Norfolk, and Shirley Todd, Adrienne Neal, and Dorothy McLaurhorn, all of Virginia Beach, , and three grandchildren.

HENRY SPIEGELBLATT, 74, a retired deputy director for intergovernmental affairs of the Medicare-Medicaid programs who was a member of Olam Tikvah Hebrew Congregation in Fairfax, died of cancer Jan. 31 at the National Institutes of Health. He lived in Annandale.

Mr. Spiegelblatt moved here and joined the old Department of Health, Education and Welfare in 1966. He was policy director of the Medicare program, and then served as intergovernmental affairs deputy director for seven years before retiring in 1986.

He was the recipient of a distinguished service award from the Association of State Medicaid Directors.

Mr. Spiegelblatt was born in Danbury, Conn., and grew up in Newport, R.I. He served with the Army in Italy during World War II. He was a graduate of the University of Rhode Island and received a master's degree in public administration at the University of Michigan. Before joining the federal government, he had worked for the state of Rhode Island, the Chicago Board of Health, and in private industry in New York.

Survivors include his wife, Yvonne, and a son, Paul, both of Annandale, and a sister, Ruth Rosenthal of Newport.