14''' Sans_Rival Kosmos Chimney, the most popular size. 2.031" base diameter, 10 3/4" tall - Also fits Harvard Student Lamps that have a nominal base diameter of 2". Borosilicate glass, made in the USA from a mold made from an original German Sans Rival chimney found in Norway.
The genesis of the Sans Rival chimney (sometimes referred to as "Phenomen") appears to have been the work of Mr. P. Bayle; his experimental work on chimney combustion principles influenced many subsequent chimney designs as his work was published in the Scientific American Supplement No. 458 on October 11, 1884.
Original Sans Rival Chimney was made in Germany. "There where several firms that imported “Sans Rival” chimneys into Norway from Germany: Peter M Kolderup (est 1854) and Johan Tomsen A/S (est 1904) being the best known.
