"The reflection of the flame [produced by the manometric capsule] was watched in a mirror backwards and forwards as in Fig 1.
m'm' being the initial position of the mirror it was swung so as to assu me successively the positions mm; m2m2; mm; m'm'; mm; m2m2 &c.
The imaginary axis a [alpha] was vertical. No trace of vibration was pe rceptible in the reflected flame."
Bell did observe the small cylinder c' moving against the end of the larger cyli nder C, yet the flame did not change. He removes the small cylinder in the ex periments that follow, and observes changes in the flame shapes.
Probably should be re-scanned because the eye showing line-of-sight was omitted. (cnn)