historically important and all original dated 1890 cast brass encased steam pressure gauge from the pontiac building's original heating plant installed by chicago-based theo. jacobs company. the oversized brass steam gauge was fabricated by jas. p. marshall and company. the steam gauge flush-mount 0-200 psi gauge retains the original lightly incised with black enamel silver metallic faceplate and arrow or needle. the size and type is similar to the one used in adler and sullivan's schiller building as shown in the image taken by richard nickel. like holabird and roche's pontiac heating plant gauge, the date of installation is found below the word "steam." unlike schiller, the pontiac gauge does not feature the building's name on the faceplate. the 14-story structure is one of holabird and roche's ealiest skyscrapers still standing in chicago's loop. during it's restoration long ago, the interior, including elevators, doors, and other original features were mostly discarded.