It consists of laminated U & I Cores of low loss magnetic. Material, to from a closed core of cross section 25mm in plan of laminations, 32mm. U core external height 102mm, internal height to take bobbin length 787mm. Cast Aluminium alloy stand consisting of a heavy base on four rubber feet with two removable clamping arm. Maximum dimension of base 190x2990x115mm across full width. Arms pivot on steel spindle with adjustment to knobs to knobs to rear

 1 Coil of 300 turns of 220 volts AC

1 Coil of 600 turns of 220 volts AC

1 Coil of 1200 turns for 220 volts AC

1 Coil of 3600 turns for 220 volt AC