Dial-A-Matic Adding Machine
date: label: date made
content: ca 1960
name: label: maker
content: Sterling Plastics
notes: label: Description
content: The front of this instrument is a six-wheeled stylus-operated plastic adding machine. Each wheel has a ring of ten holes. The holes are numbered from 0 to 9 counter-clockwise around the outside and from 0 to 9 clockwise around the inside. Outer digits are for addition, and inner ones are for subtraction. Square windows above the wheels show the result. A zeroing bar is on the right and a short aluminum stylus is on the left. The instrument is mounted on a piece of fiberboard. Behind it, mounted on a piece of wood on the fiberboard, are two rods, with five dials on each rod. Each dial has the digits from 0 to 9 around the outside. Each rod and its mounting slide along a track at the top of the instrument. These rods and dials were added by the donor, the inventor Waldemar Ayres (b. 1909).
label: Description
content: The instrument is marked on the front: Dial-A-Matic ADDING MACHINE. It is also marked there: SP (/) STERLING. The letters “SP” are in a circle. The New Jersey firm of Sterling Plastics used the trademark of SP in a circle with a clear background from 1945, registered this as a trademark in 1953, and renewed the trademark in 1973. The company first used the term Dial-A-Matic in commerce in 1954, registered it as a trademark in 1955, and renewed the trademark in 1975. The device is based on a patent taken out by Otto Lehre of Springfield, New Jersey. Lehre applied for a patent April 30, 1954 and received it in 1957. The object came to the Museum in 1974. Hence it was created between 1955 and 1974. It seems likely that it dates from about 1960.
label: Description
content: Reference:
label: Description
content: Otto Lehre, "Calculator," U. S. Patent 2,797,047, June 25, 1957.
label: Location
content: Currently not on view
place: label: place made
content: United States: New Jersey
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Adding Machines
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Waldemar A. Ayres
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.335327
label: accession number
content: 310129
label: catalog number
content: 335327
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: fiberboard (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: brass (overall material)
label: Physical Description
content: aluminum (overall material)
label: Physical Description
content: wood (overall material)
label: Measurements
content: overall: 6.3 cm x 30.6 cm x 14 cm; 2 15/32 in x 12 1/16 in x 5 1/2 in