by tonytran2015 (Melbourne, Australia).
Figure 1: Diagram of the experiment. Figure 2: Lighting a cigarette by sunlight. Smouldering is visible after 27seconds.
I used here
1. a device consisting of a lens and a mirror right behind it (see following pictures),
2. then another alternative device being the dial face of an unusual Storm brand Remi watch (in the above pictures).
The combination of a lens and a mirror right behind it produces a large aperture system giving high power concentration and it also has light weight and convenience for cigarette lighting. My 60mm lens and mirror system with aperture ratio of d/f =60/65 = 1/1.1 regularly makes cigarette fire in 15seconds.
The Storm brand watches has an interesting unusual Remi model that has a mirror face with 2 small and 6 tiny windows for displaying painted numerical hours, minutes and fraction of a minute. The rest of the face…
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