About MATSUMOTO EIJU
About 日本計量史学会
About KOHAMA KIYOKO
About 電気学会研究会資料
About technical history
About unit
About museum
About electrodynamics
About experiment
About Europe
About electrical measurement
About recording
About document
About telegraphy
About 計測史
About ampere
About パリ工芸博物館
About Biography
About telegraph
About Measurement of electromagnetic quantities in general