Established in 1814 "for young ladies of means," the school is one of the top girls' prep schools in the country, currently with a $179 million endowment. The write-up in the May 1930 issue of THE DIAPASON doesn't indicate if the organ was in the Auditorium or the Chapel.
Information identifying this instrument from the Austin Organs, Inc. web site, accessed December 20, 2004: http://www.austinorgans.com/organ-research.htm.