In Blackburn's rooms they swung on 'Blackburn's pendulum', an ingenious device with a double suspension, which could oscillate in planes at right angles to each other.
Sa Blackburn's rooms nila swung sa 'Blackburn's palawit', isang napakagaling na aparato na may double suspension, kung saan ay maaaring mag-urong-sulong sa eroplano sa kanan angles sa bawat isa.