A substantial and very high quality triple coil holder with a bakelite body and base, brass coil pins and a 5:1 geared rotation of the outside coil holders. The centre coil holder is static. The holders are marked as 'Reaction', 'Secondary ATI' (Antenna Tuning Inductance) and Primary.

The base measures 72 mm by 132 mm and the height to the top of the coil pin is 88mm. The box states that it is for Burndept Coils but any pin and socket coil would fit the holders. The Burndept catalogue number is 135.

The advert shown opposite is taken from the inside cover of Modern Wireless magazine dated June 1925 showing a reduced price of 20 shillings for the triple coil holder and 15 shillings for the dual coil holder. Click the image to enlarge.