抄録
Measurement of air permeability of paper less than a few seconds is unavoidablly subject to a great deal of error so far as the use of hand-operated stop watch. So we developed an automatic permeability tester using a electric second-watch and a light-relay device.
It is confirmed that using the device described, which enables one to test on one-sheet basis instead of using as test proof numerous sheets put together in layer, the exactitude in time of measurement for papers of high air permeability can be improved to a great extent.
