Induction coil, du bois-reymond type
On application
Induction coil, du bois-reymond type. Signed: fr. Runne – rohrbach – heidelberg mahogany, long wooden base hinged in middle, with channel for sliding secondary coil 126 cm, metal scale on base, mm divisions; coaxial primary coil fixed to wooden support at one end, with adjustable electromagnetic contact breaker and six brass terminals; secondary coil, with with brass terminals, mounted on slidding wooden bobbin.
