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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443   
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Rhd motor, swings round to reflect to the driver the position of the wheels in relation to rocks/obstacles when the driver has no spotter, much along the lines of "Bike" mirrors fitted to hgv's
Sounded like I knew what they were there for.............no idea  |
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6th Dec 2011 12:45am |
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| cradgebank Member Since: 30 Dec 2008 Location: Nottingham Posts: 308 
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Reminds on coming vehicles to dip their headlights by reflecting their main beam back at them. Richard
Either a 90, 110 or 130. Discovery 5 |
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6th Dec 2011 12:51am |
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| Bobble Member Since: 21 Aug 2011 Location: Hampshire Posts: 223 
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'Course we're all assuming that because it's the same shape as a mirror it must be a mirror but compare it to the conventionally fitted one just below it and it's huge!
It's not something off-beat like a portable solar panel temporarily hung on the roll cage is it? |
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6th Dec 2011 1:37am |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6041 
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I saw a similar thing in Tom Sheppards books.
It's (i think) for showing the undulations on the ground... set the mirror to reflect on the sand, so you have a "point" of reference, and you'll then be able to see holes/dips etc on the ground that would otherwise be camoflagued by the rest of the sand. |
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6th Dec 2011 8:57am |
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299 
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its a "dibs mirror" and diesel jim wins the prize
see page 73..... http://www.oasisphoto.com/docs/Desert%20Expeditions.pdf |
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6th Dec 2011 10:26am |
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| 110SEB Member Since: 29 Jan 2009 Location: Essex, England Posts: 1444 
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Ah! You live and learn. Here's the excerpt:
Dibs-Mirror. A large, -say 5in x 7in -flat, forward facing mirror universally mounted from the windscreen pillar of the vehicle to reflect the sun as a spot of light onto the ground 30-50m ahead can be of great value off-tracks in the desert as a terrain slope indicator and a direction-of-travel marker. Its most important use is the former. In conditions of strong high sun on the smooth unbroken surface of virgin sand it is possible to drive over the edge of a dune or into a dune base without seeing it. The spot of light gives a point of focus on the sand. The spot disappearing or moving up, left or right, will give advance indication of a dune edge or slope change. As a heading marker , once the direction of travel has been established, the spot of light can be adjusted to lie dead ahead and then followed. By the laws of optics applying to reflected light, deviation of the vehicle from the desired course by 50 causes the light to move through 100. |
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6th Dec 2011 10:57am |
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