The New York Public Library is uploading it's digital collection, so far the only silent film score I could locate for viewing was 1925 compiled Ben-Hur score. The list of material is amazing and worth viewing, a great idea, and I'm happy to live in an age that makes research so easy.
http://digitalcollections.nypl.org/search/index?filters%5Btopic_mtxt_s%5D%5B%5D=Silent%20film%20music&keywords=&layout=false
Eric W. Cook
Director, Ivy Leaf Orchestra
Silent Film, Salon and Ragtime Orchestra
Please visit us at ivyleaforchestra.com