One of the local guys at our place brought in what looks to be an early form of Ambush Light or possible electrical trip flare. As you can see by the pictures it's housed in a wooden box with a trip mechanism, a bulb and a space for a battery. It also has a couple of ways that it could be secured to surrounding objects. Inside the lid of the box there is a small stamp of a crown and 1818, not that I think for one minute that it dates back to then! Anyone have any ideas what it is, when it dates from etc?