Peter L. Robinson Sr., 87, a retired industrial science teacher at Armstrong High School and an Army veteran of World War I, died of cardiac arrhythmia Sunday at Howard University Hospital.

Maj. Robinson, who remained in the Army Reserves after the war until retiring in about 1958, continued to use his military title until his death.

He had served with the 368th Infantry in Europe during the first world war and had been wounded in a German poison gas attack. During World War II, he taught military science and tactics full-time at Armstrong High School.

A native of Washington, Maj. Robinson was a graduate of Armstrong. He also graduated from the old Miner Teachers College, took postgraduate work there, and earned a degree from the Howard University Law School in 1924.

He taught in the D.C. public school system, mostly at Armstrong, for 45 years before retiring in 1958. He had coached championship Armstrong baseball teams.

Maj. Robinson was a past grand master of the Charles Datcher Lodge No. 15 of the Masons. He was an active member of the First Baptist Church, New Hampshire Avenue and Randolph Street NW, where he had been chairman of the board of trustees.

His father had been one of the ex-slave charter members of the original First Baptist Church in old Southwest Washington.

Maj. Robinson's first wife, the former Marie McCutchin, died in 1943.

He is survived by his second wife, Hattie C., of the home in Washington, a daughter, Marie R. Johnson, of Kensington; two sons, Peter L. Jr. and David C., both of Washington, and three grandchildren. CAPTION: Picture, PETER L. ROBINSON SR.