Jeffers Calculator, American ready reckoner for nu

Made:
1907 in United States

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Science Museum Group Collection
© The Board of Trustees of the Science Museum

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
Materials:
brass, ivory, wood
type:
ready reckoner (medical)
credit:
Auction Team Koln
status:
Permanent collection

Cite this page

Rights

We encourage the use and reuse of our collection data.


Data in the title, made, maker and details fields are released under Creative Commons Zero


Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence

Using our data

Download

Download catalogue entry as json

Download manifest IIIF

Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.