シーメンス丸型抵抗器
器材3D模擬實境
器材3D實體賞析
器材原始說明資料：
No.30
Siemens 社製丸型抵抗器
Variable Resistance , 可変抵抗器
Sliding Contact Regulating Resistance ( Siemens & Halske )
電気
Special Catalogue of the Joint Exhibition of German Mechanicians and Opticians (1900)
Size about 250 in Diameter
