Geraldine Walker Haupt, 79, a physicist with the National Bureau of Standards until her retirement in 1969, died Monday at Montgomery General Hospital following a heart attack.

Mrs. Haupt was a color specification specialist and did extensive research on three-color systems. Her early work in the field of colorimetry led to the development of color (or glass limit) standards for railway, airway, marine and highway traffic signals. She also helped develop color standards used in grading oil.

Before joining the Bureau of Standards in 1928 as an assistant physicist in the colorimetry division, she had taught physics at Goucher College in Towson, Md., and was a research associate with the Munsell Color Research Laboratory in Baltimore and the American Oil Chemists' Society.

A native of Shenandoah, Pa., Mrs. Haupt moved to Baltimore as a girl. She earned a bachelor's degree from Goucher College, and in 1926, a master's degree from Johns Hopkins University.

In 1934, she married Ralph F. Haupt, an astronomer with the U.S. Naval Observatory here.

Mrs. Haupt was the author and coauthor of many papers in her field and contributed articles to the journal of the Optical Society of America.

She was a fellow of the Optical Society of America and a past president of the Eistophos Science Club, an 85-year-old organization of scientists and their wives.

In addition to her husband, of the home in Rossmoor Leisure World in Silver Spring, she is survived by a son, Robert W., of Bethesda.

The family suggests that expressions of sympathy be in the form of contributions to the Inter-Faith Chapel Building Fund in Rossmoor.