Wye Level

Wye Level

<< >>
Usage conditions apply
This "Convertible Level" is based on the patent (#1,234,520) for a combined level and transit granted on July 24, 1917, to Adolph Wissler (1866–1926), the St. Louis instrument maker who made many of the surveying instruments sold by Aloe. With the telescope in its standard position, it is a standard architect's level. With the telescope turned 90 degrees, it can be used to take vertical sights. The small horizontal circle is graduated to degrees, and read by vernier to 5 minutes. The level is provided with a metal trivet for setting up the instrument in places where the use of a tripod is difficult. The level is marked "A. S. Aloe Co. St. Louis 90607" and "PAT. 7-24-1917." New, it cost $75.
Ref: A.S. Aloe Co., Instruments and Supplies for Civil Engineers, Architects, Surveyors (St. Louis, about 1919).
Currently not on view
Object Name
wye level
Wissler, Adolph
A.S. Aloe and Company
place made
United States: Missouri, St. Louis
telescope: 12 1/2 in; 31.75 cm
horizontal circle: 3 1/2 in; 8.89 cm
overall in case: 7 1/2 in x 13 5/8 in x 5 1/4 in; 19.05 cm x 34.6075 cm x 13.335 cm
ID Number
patent number
accession number
catalog number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.


Add a comment about this object