ZES 150. Plug Key, One Way :

Thick brass block of 9mm fitted on heavy Bakelite base provided with all brass terminals and brass screws.

ZES 151. Plug Key, Two Way :

Same as above

ZES 152. Plug Key, Three Way :

On bakelite base with brass terminals.

ZES 153. Plug Key Four Way :

On bakelite base with brass terminals.

ZES 154. Knife Switch Single :

Single pole, double throw, mounted on bakelite base.

ZES 155. Knife Switch Double :

Double pole, double throw, mounted on bakelite base.

ZES 156. Reversing switch :

Rotary brush, type switch with phosphor-bronze contacts. Screw terminals. Maximum current 10A. Mounted on an insulating base.

ZES 157. Pohls Commutator :

Used in experiments on hystersis. The thick brass sheet contact arms and the joining strips are fitted on Bakelite base. Operation of the contact arm is done with Bakelite handle. The terminals are provided on the sides of the square base. Max current 5 Amp but supplied without mercury.

ZES 158. Charge & Discharge Key :

Used for charging & discharging of a capacitor. Nikel plated brass strips & pillars are used. Three terminals for connections fitted on a thick Bakelite plate.

Contact Resistance 2 milli ohm approx.

ZES 159. Raleighs Key :

Fitted on thick Bakelite bases with all brass parts.