Osby L. Weir, a leader of Washington's civic and business communities, was eulogized yesterday afternoon as a man "who had a wide spectrum of interests, being both logical and mechanical, poetic and artistic . . ."

Mr. Weir, 64, a past president of the Metropolitan Washington Board of Trade, died Thursday of pneumonia at Suburban Hospital. He was described by Dr. Christopher Garriott, pastor of the North Chevy Chase Christian Church, as a man who was "deeply conscientious, yet considerate of the feelings of others.

"He was a person of integrity and maturity, being both concerned and compassionate. And finally, he was true to the faith he professed and the convictions he held," Dr. Garriott said.

Mr. Weir and his wife Frances E. began attending the North Chevy Chase Christian Church shortly after they came to Washington in 1962, when Mr. Weir was named general manager for Sears, Roebuck and Co. in the Washington-Baltimore metropolitan area.

That position, which Mr. Weir held until his retirement three years ago, capped a 40-year career he began as an office assistant with the giant retail store chain.

Mr. Weir, a native of Illinois and graduate of the University of Chicago, held various executive and managerial posts at Sears in several Midwestern cities before coming here.

In Washington, Mr. Weir was as well, or better, known for his various community and civic activities as he was for his connection with Sears.

Joseph B. Danzansky, president of Giant Food Ind., a competitor of Mr. Weir's, said yesterday of Mr. Weir's death: "It's a real, honest to God, loss.

"He was literally one of the finest gentlemen who ever came on the Washington scene. I remember him as president of the Board of Trade. I remember him as a competitor in business, but as an honest and fair one, and I rember his activities with the Boy Scouts, and Junior Citizens Corps and for the (National) Symphony and for anything anyone would ask him to do that would help better our city. His desire to help the city was limitless," Mr. Danzansky said.

As a leader of the Board of Trade and a past chairman of the Washington Convention and Visitors Bureau, Mr. Weir was a strong proponent of the construction of a convention center in downtown Washington, his wife recalled yesterday.

"He felt the project had a lot to offer Washington," Mrs. Weir said.

Mr. Weir served three terms as president of the Washington National Symphony Orchestra Association, was a member of the board of directors of the National Capital Area Council of the Boy Scouts of America and was a trustee of American University, all of which were institutions in which Mr. Weir took a special interest and positions of which he was particularly proud.

Mrs. Weir said her husband also derived great satisfaction from his work as a director of the Federal Reserve Bank of RIchmond. He did not, she said, loan the use of his name to civic or social groups. Rather, she said, he would only join those organizations which he felt he truly had the time and energy to help.

Among the other groups which Mr. Weir at various times served as a board member were the Police Boys' Club, the Better Business Bureau, the Washington Technical Institute, the YMCA, the District Chapter of the American National Red Cross and the Consortium of Universities of the Washington Metropolitan Area.

Mr. Weir is survived by his wife, of the home in Kensington; a son, Dr. Robert A., of Arlington, Texas; a daughter, Linda L., of Des Plaines, Ill.; a sister, Mable Bergquist, of Riverside, Ill. and two grandsons.

The family requests that in lieu of flowers donations he made to the Osby Weir Memorial Fund at the North Chevy Chase Christian Church.