C.W. Hergenroeder Adding Machine
date: label: date made
content: 1882
name: label: patentee
content: Hergenroeder, Christian W.
label: maker
content: Hergenroeder, Christian W.
notes: label: Description
content: This U.S. Patent Office model for an adder has a wooden frame with a round brass top and mechanism. A toothed disc under the top has the digits from 0 to 99 indicated on it in ink. The 99 complement also is indicated, for use in subtraction. To the right of the disc is a series of pins labeled from 1 to 10. An arm extending from the right side of the disc fits between the pins. Pulling the arm forward advances the disc by the amount indicated on the scale. When the disc has advanced a full rotation, it advances a smaller, vertically mounted disc on the left side by one unit. Complementary units are also indicated on the edge of this disc. The device also has a set of nine wooden digit wheels, with paper around the edge, at the front. These are intended for keeping track of numbers used in calculations.
label: Description
content: According to the 1900 U.S. Census, Christian W. Hergenroeder was then 36 years old and living in Baltimore. He was born in Germany of German parents, immigrated to the United States in 1882, and was a naturalized citizen. His wife, Sofia, was born August of 1866, also in Germany of German parents, and came to the United States in 1891. She apparently was not naturalized. Their son, Christian Jr., was born November of 1895. Both parents could read, write, and speak English. Christian's occupation was given as laborer. The family lived in a rented house. Hergenroeder was not found in 1880, 1910, 1920 or 1930 U.S. Census records.
label: Description
content: Another patent was granted to Christian W. Hergenroeder of Baltimore, for an improvement in music leaf turners. He applied for this patent on January 5, 1882, and was granted it on October 10, 1882 (#265602).
label: Description
content: Reference: U.S. Patent No. 263904, September 5, 1882.
label: Location
content: Currently not on view
place: label: place made
content: United States: Maryland, Baltimore
label: place patented
content: United States: Maryland, Baltimore
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Adder
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of L. Leland Locke
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.311960
label: accession number
content: 155183
label: catalog number
content: 311960
objectType: label: Object Name
content: adder with carry
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: brass (overall material)
label: Physical Description
content: paper (overall material)
label: Measurements
content: overall: 5 cm x 31 cm x 21.3 cm; 1 31/32 in x 12 7/32 in x 8 3/8 in