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Facing the sun, place the mirror next to your eye—or, if it has a sight, hold the mirror right up to your eye to peep through the hole—and then look toward the sun. Next, draw the mirror closer to your face, and while looking through the hole, aim for the aircraft above you by focusing the reflection towards it. According to experts, plastic mirrors are advantageous as they are light and can be manipulated with one hand without breaking. However, keep in mind that glass mirrors can reflect sunlight much farther than plastics.
Signal mirrors are available in glass or plastics (eg. polycarbonate). There are advantages and disadvantages to each material. Glass is brighter, more reflective, and is hard to scratch. The only downside to glass is that it can shatter. Some experts advise buying a plastic mirror that's light enough to be manipulated with one hand and resistant to breaking [source: Murray]. But others recommend glass mirrors, which can reflect sunlight much farther. Deacon, Richard (1978). The Silent War: a History of Western Naval Intelligence. David & Charles. p. 21. ISBN 978-0715375570.Henry Christopher Mance (1840–1926), of the British Government Persian Gulf Telegraph Department, developed the first widely accepted heliograph about 1869 [2] [22] [23] while stationed at Karachi, in the Bombay Presidency in British India. Mance was familiar with heliotropes by their use for the Great Trigonometrical Survey of India. [10] The Mance Heliograph was operated easily by one man, and since it weighed about seven pounds, the operator could readily carry the device and its tripod. The British Army tested the heliograph in India at a range of 35 miles with favorable results. [24] During the Jowaki Afridi expedition sent by the British-Indian government in 1877, the heliograph was first tested in war. [25] [26] Fig. 4: US Signal Service heliograph, 1898 Holzmann, Gerard (1995). Björn Pehrson (ed.). The early history of data networks. IEEE Computer Society Press. p. 10. ISBN 0818667826 . Retrieved 18 November 2012.
For example, there were the 4 people who were floating in life vests for two nights in the waters off the Bahamas. Even though several boats and planes went by, the victims weren’t noticed. It wasn’t until they used a shiny credit card to send a signal that they were rescued. Next, ensure the mirror perfectly faces in the direction of the sun to create a reflection. You can use your inactive hand to shield your eyes from the intense sun rays.SOS fires are a great way to draw attention to yourself, especially at night. Building three fires in either a straight line or in a triangle is the internationally recognized symbol of emergency distress. And be sure to build each fire approximately 100 feet from each other to reduce the chance of starting a forest fire. The last thing you’ll want is to be running for your life in the middle of nowhere. SOS Signals for Confinement in Trapped Spaces With the signal mirror in hand, hold the mirror next to your eye and face the sun. Stretch out your other hand and gradually tilt your head until you see the reflected light remains on your hand. Best Glide ASE Military Grade Glass Signal Mirror Type 1 – Mark 3, Military Issue 2”x3” and the 3”x5” That rafter isn't alone in owing his life to a signal mirror. Over the decades, there have been many other people stranded in dire situations in the wilderness or at sea whose lives have been saved by this simple device. With a flash that can be seen for up to 100 miles, the signal mirror has been called the most under rated survival tool in a survival kit. Best results with the MIL-M-18371E, Military Glass Signal Mirror are achieved when the air is clear and the sun is well above the horizon. However, visible signal flashes can be created even on hazy or overcast days. Signal flashes can be seen even when you cannot see the aircraft, boat, or other means of rescue. So when signaling and no specific targets are in sight, be sure to continually sweep the horizon with the signal mirror to maximize your chances of being seen. At night, flashlights, headlights, and moonlight can produce effective signals with your Military Glass Signal Mirror.
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