Haig Tells of Theories on Erasure

White House chief of staff Alexander M. Haig Jr. said yesterday he and White House lawyers had discussed fears that "some sinister force" erased one of President Nixon's subpoenaed Watergate tapes.

Testifying in federal court here, Haig told of what he called the "devil theories" about the controversial 18 1/4-minute gap in the recording, which has yet to be explained.

Haig said the fears were aired at a White House meeting on the evening of Nov. 20, the day before the President's lawyers apprehensively reported the erasure to U.S. District Court Judge John J. Sirica.

At that point, Haig said, the lawyers were convinced that President Nixon's personal secretary, Rose Mary Woods, could not have caused the two-toned humming noise that obliterated the tape for an 18 1/4-minute interval.

Miss Woods has testified that she might have caused a five-minute gap in the recording, but, she insisted, no more than that.

The erasure obliterated a June 20, 1972, discussion of the Watergate scandal between the President and former White House chief of staff H.R. (Bob) Haldeman. The 18 1/4-minute segment was drowned out by a long humming noise that drops noticeably in volume after the five-minute mark.

Haig said this was "a source of great distress" to White House lawyers.

As a result, he said, they discussed the possibility that "perhaps there had been one tone applied by Miss Woods . . . and then perhaps some sinister force had come in and applied the other energy source and taken care of the information on that tape."

Judge Sirica broke in and asked Haig: "Has anyone ever suggested who that sinister force might be?"

Haig said, "No, your Honor." He said he told the lawyers that they should first find out who had been given access to the recording.

White House records indicate that only Miss Woods and presidential assistant Stephen Bull were given the tape since it was subpoenaed last July. They got the recording last Sept. 29 after Mr. Nixon asked Miss Woods to summarize the highlights for him. Bull was told to help her.

Miss Woods said she might have caused a five-minute gap in the tape when she accidentally pushed the wrong button on a recording machine in her office Oct. 1 during the course of a short phone call.