Hover-Piano as recurring in-world flying machine across Books 11, 12a and 12b

x_p5_362 recurring_element

The Hover-Piano, built by Mr. Rosebank, appears as an in-world flying machine in Book 11 (introduced and used to signal class periods), Book 12a (Mr. Rosebank flies past on it; described in back-matter), and Book 12b (described in back-matter).

books Book 11 Book 12A Book 12B

subjects Hover-Piano

Evidence

b11 p054 (f_b11_020): Hover-Piano trialled as period-end signal at school	We want to if it's effective as a way of signaling the end of each period. When you hear it, it's time for your next lesson!	b11:c02:p054
b12a p039 (f_b12a_024): Mr. Rosebank flies by on the Hover-Piano	Mr. Rosebank flew by on his hover-piano.	b12a:c02:p039
b12b p226 (f_b12b_171): Hover-Piano described in b12b back-matter	The Hover Piano is an extraordinary and complicated flying machine built by Mr. Rosebank in his spare time.	b12b:c99:p226

citations b11:c02:p054 b11:c99:p329 b12a:c02:p039 b12a:c99:p271 b12b:c99:p226