Spark gaps
Spark gap with curved handle, made of brass and ebonite, incomplete, possibly used by Riviere, 1870-1930, European
2 spark gaps and one handle, brass and ebonite, possibly used by Riviere, 1870-1930, European
Spark gap with curved handle, made of brass and ebonite, incomplete, possibly used by Riviere, 1870-1930, European
Curved ebonite handle, possible used by Riviere, 1870-1930, European
Spark gap, brass and ebonite, possibly used by Riviere, 1870-1930, European