by tonytran2015 (Melbourne, Australia).
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#make fire, #making fire, #fire, #Sun, #sunlight, #sunray, #lens, #magnifying glass, #mirror, #survival.
Figure 1: Diagram of making fire by a mirror.
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…
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