John Carbutt

He came to be the first to use celluloid for photographic film and to market dry-plate glass negatives.

In 1866, as the official photographer for the Union Pacific Railroad, he produced the series of stereographic cards titled Rail Road Excursion to the 100th Meridian.

[1] The series celebrated the crossing of the border between the western and eastern United States in October 1866 during the construction of the transcontinental railroad.

That image format is one of the dominant formats to this day, as the majority of high end digital cameras use a 35mm frame-sized sensor and 35mm film is still being used by some photographers and film makers.

[4] Carbutt is interred at West Laurel Hill Cemetery, Bala Cynwyd, Pennsylvania.