Clyde T. Holliday, 70, a principal staff engineer at the Johns Hopkins Applied Physics Laboratory and a specialist in space photography, died at the National Orthopaedic and Rehabilitation Hospital in Arlington June 23 after a stroke. He lived in Ashton, Md.

Mr. Holliday, who was born in Hermleigh, Tex., attended Texas A&M and Georgetown universities and the Rochester Institute of Technology.

He moved to Washington in 1942 to work for the Carnegie Institution. He joined the Applied Physics Laboratory in 1943.

During World War II, he worked on the development of the proximity fuse for artillery shells. After the war, he designed and installed cameras used to take the first photographs showing the curvature of the earth from 100 miles in space.

In 1965, he transferred to the APL space department and worked on cameras used in the Apollo moon voyages and other space experiments. He also studied eclipses of the sun and conducted electro-optical tests for the laboratory's submarine technology division.

He was a member of the Society of Photographic Scientists and Engineers and the Society of Photo-optical Instrumentation Engineers.

Survivors include his wife, Lois, and three children, Susan, Steven and Eric, all of Ashton, and a brother, Francis K., of Palmer, Tex.