Skip to main content

Search

Donate

Home Smithsonian Institution

Site Navigation

  • Visit
    • Museums and Zoo
    • Timed-Entry Passes
    • Tips & Guidelines
    • Accessibility
  • What's On
    • Exhibitions
      • Current Exhibitions
      • Upcoming
      • Past Exhibitions
      • Online Exhibitions
    • Today's Events
    • Online Events
    • All Events
    • IMAX Films
  • Explore & Learn
    • Explore Interests
      • Art & Design
      • History & Culture
      • Science & Nature
      • Blogs
      • Mobile Apps
      • Podcasts
    • Collections
      • Open Access
      • Smithsonian Snapshot
    • For Educators
      • Resources
      • Field Trips
      • Events
      • Professional Development
    • For Kids and Teens
    • Youth Programs
    • For Researchers
      • Libraries
      • Archives
        • Smithsonian Institution Archives
        • Air and Space Museum
        • Anacostia Community Museum
        • American Art Museum
        • Archives of American Art
        • Archives of American Gardens
        • American History Museum
        • American Indian Museum
        • Eliot Elisofon Photographic Archives, African Art
        • Freer|Sackler Archives
        • Hirshhorn Archive
        • National Anthropological Archives
        • National Portrait Gallery
        • Ralph Rinzler Archives, Folklife
        • Libraries and Special Collections
  • Get Involved
    • Volunteer
      • Behind-the-Scenes
      • Citizen Science
      • Digital Volunteers
      • Smithsonian Call Center
      • Visitor Information Specialist
      • Docent Programs
    • Fellowships & Internships
    • Work with Us
      • Human Resources
        • Working Here
        • Employee Benefits
        • Job Opportunities
        • How to Apply
        • Job Seekers with Disabilities
        • Frequently Asked Questions
        • Contact Us
      • Affiliations
      • Global Partners
  • Support
    • Become a Member
    • Renew Your Membership
    • Give Monthly
  • About
    • Museums and Zoo
    • Research Centers
    • Cultural Centers
    • Education
    • Our Leadership
      • Secretary Bunch
      • Assistant Secretary for Advancement
      • Assistant Secretary for Communications and External Affairs
      • Under Secretary for Administration
      • Under Secretary for Education
      • Under Secretary for Museums and Culture
      • Under Secretary for Science and Research
    • Our Organization
      • Board of Regents
        • Members
        • Committees
        • Reading Room
        • Bylaws, Policies and Procedures
        • Contact
        • Schedules and Agendas
        • Meeting Minutes
        • Actions
        • Webcasts
      • Inspector General
        • About the OIG
        • Contact OIG
        • Office of Audits
        • Office of Investigations
        • Reports and Other Publications
        • Report Waste, Fraud, Abuse
      • General Counsel
        • Legal History
        • Internships
        • Records Requests
          • Records Request Reading Room
        • Tort Claim
        • Subpoenas & Testimonies
        • Events
      • Equal Employment Office
        • EEO Complaint Process
        • Individuals with Disabilities
        • Special Emphasis Program
        • Supplier Diversity Program
          • Doing Business with Us
          • Policies and Procedures
          • Additional Resources
          • Goals and Accomplishments
    • Reports and Plans
      • Annual Reports
      • Metrics Dashboard
        • Dashboard Home
        • Virtual Smithsonian
        • Public Engagement
        • National Collections
        • Research
        • People & Operations
        • One Smithsonian
      • Strategic Plan
    • Newsdesk
      • News Releases
      • Media Contacts
      • Photos and Video
      • Media Kits
      • Fact Sheets
      • Visitor Stats
      • Secretary and Admin Bios
      • Filming Requests

Hart's Mercantile Computing Machine

National Museum of American History

Addthis Share Tools

    • Print

Object Details

patentee
Hart, William
Scovill Manufacturing Company
Description
The instrument consists of three concentric brass discs, a brass marker, a steel stop, and a wooden handle (instrument must be removed from box to find handle). Each brass disc has the numbers from 0 to 99 stamped around the edge. The two inner discs both have a circle of 100 holes just outside the numbers. The inner holes are used to add the last two digits of a number by rotation. Any hundreds value in the sum carries to the second set of holes, which are used to add hundreds and thousands places.
The machine is in a cylindrical wooden case with cover.
According to the Kirksville Missouri Democrat for July 26, 1888, by then Hart had sold 3500 of these devices and “he lately ordered one thousand more.”
References: U.S. Patent #199289
P. Kidwell, "Adders Made and Used in the United States," Rittenhouse, 1994, 8:78-96.
Kirksville Missouri Democrat, July 26, 1888.
Location
Currently not on view
Credit Line
Gift of Mrs. Robert T. Kerr
1878
ID Number
1993.0510.01
accession number
1993.0510
catalog number
1993.0510.01
Object Name
adder with carry
Other Terms
adder with carry; Circular
Physical Description
steel (overall material)
brass (overall material)
wood (overall material)
Measurements
overall: 5.5 cm x 13.5 cm x 13.5 cm; 2 5/32 in x 5 5/16 in x 5 5/16 in
place made
United States: Connecticut, Waterbury
place patented
United States: Missouri, Kirksville
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adder
National Museum of American History
subject
Mathematics
Record ID
nmah_690274
Usage of Metadata (Object Detail Text)
CC0
GUID (Link to Original Record)
http://n2t.net/ark:/65665/ng49ca746a5-0b41-704b-e053-15f76fa0b4fa

Related Content

  • Adders:Circular Adders

    American History Museum
Hart's Mercantile Computing Machine, Out of Box
There are restrictions for re-using this image. For more information, visit the Smithsonian's Terms of Use page .
International media Interoperability Framework
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more.
View manifest View in Mirador Viewer

Footer logo

Link to homepage

Footer navigation

  • Contact Us
  • Press Room
  • Employment
  • Host Your Event
  • Access Smithsonian
  • EEO & Supplier Diversity
  • Inspector General
  • Records Requests
  • Privacy
  • Terms of Use

Social media links

  • Facebook
  • Instagram
  • Pinterest
  • Tumblr
  • Twitter
  • YouTube

Email signup form

Email powered by BlackBaud (Privacy Policy, Terms of Use)
Back to Top