Archive
of
Collections
Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Disk
8/12
Faber-Castell for DELBAG (DBGM)
Germany
Plastic
est. 1956-1968
Dia. = 12.2 cm
Commercial Ducting
Notes:
1) Specialized slide rule used for ducting and pipe flow calculations 2) DELBAG is a German air filtration company for industrial air pollution control.
Image 1
Image 2
