Jeffers Calculator
- Made:
- 1907 in United States
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LicenseThis image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseJeffers Calculator
Science Museum Group
© The Board of Trustees of the Science Museum
Jeffers Calculator
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Jeffers Calculator
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Jeffers Calculator, American ready reckoner for nutritive ratios, by Henry Jeffers, 1907
Like the triangular rule, this instrument is for someone who loved figures. Henry Jeffers was a New England dairyman and republican politician. He devised this ready reckoner in 1907 to compute the right mixtures of feed and ingredients for livestock nutrition. About 60 slides, each for a different animal foodstuff, can be slid into the ‘calculator’ on the right-hand side of the open box. For any number of pound weight, the dry matter, ‘proteids’, carbohydrate and fat can be read off. There is also a cost calculator.
Details
- Category:
- Mathematics
- Object Number:
- 1990-685
- Measurements:
-
overall: 213 mm x 167 mm x 26 mm,
- type:
- ready reckoner (medical)
- credit:
- Auction Team Koln
