The three real "Mammoth" lamps were the Globe Incandescent #2, Pittsburgh Mammoth and the most common, the B&H #89. Whereas most " store lamps" utilized a 4" fitter chimney, these three lamps used a 4 1/2" fitter chimney with an unusual wasp waist and tall flame spreader.
The 2 1/2" diameter wick used in these mammoth lamps produced over 10,000 BTU/hr of heat: Essentially the same wick was later used in the Perfection heater! With that heat came a price to be paid, however - fragile chimneys. Original chimneys were made with a soda lime glass and only 1/16" thick. My new chimneys are 3/32" thick and made from annealed borosilicate glass, and they can take the extreme heat without cracking.
B&H 89, Globe Incandescent #2, Pittsburgh Mammoth, Standard #2
4 ½ fitter (4.476''), 11 ½" tall
Thickness: 3/32"
Top opening: 3 11/64"
Bulge: 6"
Glass Weight: 1 lb, 1 oz.
Base tapers gently from 4.542" to facilitate quick insertion between chimney fingers.
Made in USA of fully annealed heat resistant borosilicate glass.
The photo at right shows the new chimney on a Globe Incandescent #2. The brilliant light from the chimney distorted the apparent shape of the bulge and the flash of the camera had a reflection off the extremely smooth surface at the top of the chimney.
These large chimneys are shipped one to a box.
