Image:Hydraulic-Powdered Trip Hammers.jpg

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Description

A set of trip hammers on an axle rotated by a waterwheel, a machine used to decorticate grain. From the Tiangong Kaiwu encyclopedia of 1637, written by the Ming Dynasty encyclopedist Song Yingxing (1587-1666).

This picture appears on page 93 of E-tu Zen Sun and Shiou-Chuan Sun's translation (Pennsylvania State University Press, 1966)
Source

My book
Date

August 6, 2007
Author

PericlesofAthens
Permission
(Reusing this image)

see below


This is a faithful photographic reproduction of an original two-dimensional work of art. The original image comprising the work of art itself is in the public domain for the following reason:
Public domain This image (or other media file) is in the public domain because its copyright has expired.

This applies to the United States, Canada, the European Union and those countries with a copyright term of life of the author plus 70 years.

Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement that rule of the shorter term.

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current20:27, 6 August 2007933×756 (143 KB)PericlesofAthens ({{Information |Description=A set of trip hammers on an axle rotated by a waterwheel, a machine used to decorticate grain. From the ''Tiangong Kaiwu'' encyclopedia of 1637, written by the Ming Dynasty encyclopedist Song Yingxing (1587-1666). This picture )
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