2026-03-11T22:00:51Z https://jaxa.repo.nii.ac.jp/oai

oai:jaxa.repo.nii.ac.jp:00034949 2023-06-20T23:30:30Z 1887:1890 1896:1898:1899:1908

Stuby on Pb-Brass Plates used for Harmonicas (Report III) : On the Effect of Heat Treatment upon the Irregularity of Punched Holes ハモニカ用材料としてのPb入眞鍮板に關する研究(第3報) : 打拔孔の變形に對する熱處理の影響 麻田, 宏 田中, 英八郎 Asada, Hiroshi Tanaka, Eihachiro It is evident, that inaccurate hole of a base plate of harmonica obstructs the vibration of the reed. The clearance between the reed and the hole is 0.02～0.04mm in one side. Therefore, the accuracy of the hole must be in the same order above-mentioned, but it will be hindered by internal stress of a plate. From this experiment, we can conclude that the annealing at 300～350℃ of the plate will lessen the irregularity of holes at punching. 資料番号: SA3417647000 departmental bulletin paper 東京大学理工学研究所 1951-03-10 application/pdf 東京大學理工學研究所報告 5/6 4 129 131 0371-6090 AN00162611 https://jaxa.repo.nii.ac.jp/record/34949/files/SA3417647.pdf https://jaxa.repo.nii.ac.jp/records/34949 jpn