White, Robert F. "Improvement for Center-Light Fixtures for Chandeliers." Specifications forming part of Letters Patent N. 117,131, dated Jully 16, 1871. Washington, DC: United States Patent Office, 1871.

White, Robert F. "Improvement for Center-Light Fixtures for Chandeliers." Specifications forming part of Letters Patent N. 117,131, dated Jully 16, 1871. Washington, DC: United States Patent Office, 1871.