Dietzgen 932S Excello Dotting Instrument

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This 2-1/4" German silver and steel metal drawing instrument consists of a teardrop-shaped plate to which is attached a mechanism that is supposed to hold a larger serrated wheel and a smaller pattern wheel. The mechanism links the wheels to a bar that holds a pen point. When the larger wheel is rolled along the edge of a T-square or straight edge, the pen point bounces up and down to make a dotted line that formed part of an engineering drawing.
The larger wheel (5/8" diameter) is marked with one of the trademarks for the Eugene Dietzgen Co., the superimposed letters E and D inside a circle formed by the letters C and o. The six smaller wheels (9/16" diameter) also have this trademark and are numbered from 1 to 6, representing six possible dotting patterns. All the wheels are made of brass. The instrument also has the trademark and is marked: EXCELLO. The arm holding the pen point is marked: DIETZGEN (/) GERMANY. The instrument is in a rectangular wooden bar-lock case covered with black leather and lined with green velvet. The top of the case is marked: DIETZGEN (/) “EXCELLO”. The top is also marked: GERMANY.
This dotting instrument was advertised as model 932S in the 1926 Dietzgen catalog and sold for $5.15. It was part of the Excello product line, Dietzgen's second-highest level of drawing instruments. This object was used in the physics department at Kenyon College. Compare to 1987.0788.02.
Reference: Catalog of Eugene Dietzgen Co., 12th ed. (Chicago, 1926), 57–59, 84.
Currently not on view
date made
ca 1926
place made
place distributed
United States: Illinois, Chicago
Physical Description
german silver (overall material)
brass (overall material)
wood (overall material)
leather (overall material)
fabric (overall material)
overall: 9.9 cm x 8 cm x 1.5 cm; 3 29/32 in x 3 5/32 in x 19/32 in
ID Number
accession number
catalog number
Credit Line
Gift of Kenyon College Department of Physics
Drafting, Engineering
Drawing Instruments
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Pens and Pencils
Data Source
National Museum of American History


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