![Inductor tube](https://coimages.sciencemuseumgroup.org.uk/371/675/large_thumbnail_smg00061821.jpg)
Four inductor tubes.
![Four inductor tubes](https://coimages.sciencemuseumgroup.org.uk/53/348/medium_1930_0406.jpg)
Four inductor tubes.
Many objects in Lord Rayleigh’s collection are annotated with a reference to the volume and page of his collected works where they are discussed.
Several parts of object 1930-406 are inscribed with ink: “II p 114?”. (The question mark is part of the inscription).