Theodore Bergner Section Liner

Description:

This instrument consists of an isoceles right triangle in brass, with a hole of the same shape. A thumbscrew attached to the hypotenuse of the of the triangle holds a shaped metal plate which can rotate. Attached to this plate is a lever somewhat resembling a telegraph key. There is no rule nor room in the case for a rule. On April 2, 1872 Bergner took out a patent for a parallel ruler. However, it had a rule and a prawl not in this instrument. The instrument is in a velvet-lined, leather-covered case.

Maker: Bergner, Theodore

Location: Currently not on view

Place Made: United States: Pennsylvania, Philadelphia

Subject: Mathematics

Subject:

See more items in: Medicine and Science: Mathematics, Single Drawing Instruments

Exhibition:

Exhibition Location:

Credit Line: Gift of Allen A. Samuels

Data Source: National Museum of American History

Id Number: 1985.0438.01Accession Number: 1985.0438Catalog Number: 1985.0438.01

Object Name: Section Linersection liner

Measurements: overall: 3.5 cm x 14.2 cm x 14.2 cm; 1 3/8 in x 5 19/32 in x 5 19/32 in

Guid: http://n2t.net/ark:/65665/ng49ca746aa-9f29-704b-e053-15f76fa0b4fa

Record Id: nmah_1214874

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