Wye Level


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).

Patentee: Wissler, AdolphMaker: A.S. Aloe and Company

Location: Currently not on view

Place Made: United States: Missouri, St. Louis

See more items in: Medicine and Science: Physical Sciences, Surveying and Geodesy, Measuring & Mapping


Exhibition Location:

Related Publication: A. S. Aloe Co.. Instruments and Supplies for Civil Engineers, Architects, Surveyors

Data Source: National Museum of American History

Id Number: PH.337201Patent Number: 1234520Accession Number: 1979.0584Catalog Number: 337201

Object Name: wye level

Measurements: telescope: 12 1/2 in; 31.75 cmhorizontal circle: 3 1/2 in; 8.89 cmoverall 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

Guid: http://n2t.net/ark:/65665/ng49ca746a5-887a-704b-e053-15f76fa0b4fa

Record Id: nmah_748553

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