Individual itineraries and the circulation of scientific and technical knowledge in East Asia (16th–20th centuries)

Cecil Walton of Hardy Patent Pick - Sheffield writes to Shimomura Kôtaro 下村孝太郎　advising against the grinding of coal before washing it.

Cecil Walton of Hardy Patent Pick - Sheffield writes to Shimomura Kôtarou 下村孝太郎 declaring griding before washing as suicidal and threatening not to send the washing and griding plant if Shimomura insists on using it in invers order.