At both trials FBI typewriter experts testified that the Baltimore documents in Chambers's possession matched samples of typing done in the 1930s by Priscilla Hiss on the Hisses' home typewriter, a Woodstock brand. At both trials, the testimony was directed to comparing two sets of typed documents and not to the typewriter eventually submitted into evidence. As early as December 1948 the chief investigator for the Hiss defense, Horace W. Schmahl, set off a race to find Hiss's typewriter. The FBI, with superior resources, was also searching for the typewriter, which the Hiss family had discarded some years earlier. Nevertheless, Schmahl was able to track it down first, and the Hiss defense introduced it with the intention of showing that its typeface would not be a match for that on the FBI's documents. Surprisingly, however, the typefaces proved to be an excellent match and confirmed the FBI's evidence. Schmahl subsequently changed sides and went to work for the prosecution.