Japanese Spark Keys

 

(Click on the pictures below to see larger versions of the photo)

 

Spark key from the Japanese Battleship Mikasa, Ca. 1900. This key is in the Battleship Mikasa museum in Yokosuka Japan

 

 

 

Japanese spark key by Annaka Electrical. Annaka started in 1900 and changed their name to Anritsu in 1931.

 

 

 

Another marble-based spark key. This one was made by Nanao Musen Denki.

 

 

 

Marble-based spark key made by Nakane Denki.

 

 

 

Marble-based spark key. Maker Unknown. Possibly Nanao Musen Denki. Note the heavy metal straps underneath for carrying high currents.

 

 

Phenolic based spark key with large contacts. Maker unknown.