Details and Image
|Date||Scale Length||Area of Use
|Linear||Tube Waterways||Hemmi||Japan||Celluloid on Bamboo||1973 Apr||25 cm||Flow in Pipes
Notes: "Hemmi date code XD. Note there are no regular A, B, C or D scales. What is a ""tube waterway""? From poking around the web, I believe that a tube waterway is a pipe that supplies water to a valve or machine, such as the copper tubing connected to a kitchen faucet, or a pipe bring water to a turbine."