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.

Shimomura Kôtaro explains to the Cecil Walton of Hardy Patent Pick - Sheffield that he wants to grind coal before washing; does not want to use their elevators in the washing plant but rather use human labor

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.

Cecil Walton of Hardy Patent Pick - Sheffield writes to Shimomura Kôtarou 下村孝太郎 repeats the inadvisability of griding before washing and suggests to send the plans laid out as they think best before sending the plant.