Buff & Buff mining transit with Seagmuller solar attachment, marked "Buff & Buff Mfg. Co. Boston", patented July 1916, with Gurley tripod; image credit on full record.
Buff & Buff mining transit with Seagmuller solar attachment, silvered face marked "Buff & Buff Mfg. Co. Boston", serial number 15458, patented July 19... [more detail available via subscription]