Folder 10 1877. Report on Electric Lights for Buoys, March 13; Table of results of experiments on mineral oil, June 26-29; Note dated June 26; Accounts of Lard Oil and Kerosene Oil, June 30; "Researches at Light House Depot S.I. June 1877;" Letter to Henry from O. N. Brooks, August 4; Letter to Henry from P. C. Hains, August 14; Letter to Henry from J. C. Woodruff, August 16; Notes on Block Island, R.I. observations, August 17; Note to Francis S. Pease from Lockwood Bro's & Holly, August 30; "Report to the Board from Light House Depot," August 30; Letter to Henry from J. C. Woodruff, August 30; Letter to Henry from F. S. Pease, August 31; Draft of a report to the Light-House Board, August; Letter to Henry from O. N. Brooks (light keeper), September 1; Note to Henry from W. R. Close, September 12; Table of Intensities of Different Portions of Flames, December 6-7; Notes on light intensity of flames for December 6-7; Letter to O. W. Poe from Edmond L. Woodruff, December 15; Write up by Patent Office on J. Funck's improvements in lamps, February 8; Letter to P. C. Hains from C. S. Whitman; Introduction to Report of Light-House Board for 1877.