Born. To Margaret Truman Daniel, 35, daughter of ex-President Harry Truman, and Elbert Clifton Daniel Jr., 46, assistant to the managing editor of the New York Times', their second son; in Manhattan. Name: William Wallace.

Born. To Mary Churchill Soames, 36, youngest daughter of Sir Winston Churchill, and Christopher Soames, 38, British Secretary of State for War: their fifth child, third son (Sir Winston's tenth grandchild); in Eridge Green, England.

Divorced. Mickey Rooney. 38, pint-sized (5 ft. 3 in.) Hollywoodian admirer of taller girls (his first three wives: Ava Gardner, 5 ft. 5 1/2 in.; Betty Jane Rase, 5 ft. 7 1/2 in.; Martha Vickers, 5 ft. 4 in.); by Elaine Mahnken, 29, 5 ft. 5 in. ex-model; after six years of marriage, no children; in Santa Monica, Calif.

Died. Dudley Allen Buck, 32, exuberant M.I.T. electrical engineer and miniaturization expert, who developed the tiny cryotron to replace the transistor, was working on a cross-film cryotron (diameter: four-millionths of an inch) that would reduce a computer from room to matchbox size; of virus pneumonia; in Winchester, Mass.

Died. Louis N. Ridenour Jr., 47, top-notch nuclear physicist who, despite being emotional about his specialty (in 1946 he wrote a grim, prophetic, one-act play about flocks of satellite bombs orbiting 800 miles above the doomed earth), pioneered in missile programs as chief scientist (1950-51) of the Air Force, helped develop the Polaris and X-17 missiles as research director of Lockheed Aircraft Corp.'s missile-systems division, became a Lockheed vice president last March; of a brain hemorrhage; in Washington.

Died. Oswald D. Heck, 57, popular, powerful, longtime (23 years) Republican speaker of the New York state assembly, who ruled the often unruly legislators with fair play and wit, pushed through controversial measures (State Commission Against Discrimination, compulsory auto insurance, Governor Nelson Rockefeller's tough tax program); of a heart attack; in Schenectady, N.Y.

Died. Carl Holderman, 65, longtime (1918-54) New Jersey union organizer, once described as "the movie idea of a genial Texas oilman"; of a heart attack; in Newark. Holderman was an early C.I.O. organizer, later headed the New Jersey C.I.O., was appointed state commissioner of labor and industry in 1954 by Governor Robert B. Meyner, cleaned house at the scandal-ridden labor department.

Died. John Foster Dulles, 71; of cancer; in Washington (see NATIONAL AFFAIRS).

Died. Apsley Cherry-Garrard, 73, polar explorer who accompanied Robert Falcon Scott on his fatal Antarctic expedition in 1911, later described in chilling detail (The Worst Journey in the World) a side trip he and two .companions made to find emperor penguin eggs; in London.

Died. Irakly Tsereteli, 77, leading Social Democrat who returned from Siberian exile at the outbreak of the 1917 Russian Revolution, served as Minister of the Interior in Kerensky's provisional government until Lenin and the Bolsheviks ran him and all other moderates out of power; of cancer; in Manhattan.

Died. Stephen L (for nothing) Richards, 79, first counselor in the First Presidency of the Church of Jesus Christ of Latter-day Saints, one of the powerful triumvirate that rules the church, shrewd lawyer and businessman who concentrated on the far-flung Mormon missionary program; of a heart attack; in Salt Lake City.

Died. Sir David William Bone, 84, British master mariner who went to sea at 15, commanded troopships under fire in two wars (last to leave the torpedoed transport Cameronia in World War I, he grabbed the stay of a destroyer alongside as his ship sank), wrote several books about the sea (The Brassbounder, The Queerfella); in Farnham, England.

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