Editing Concealment device (section)

===Coins===
[[Image:Hollow dollar.jpg|thumb|right|American dollar coin used for concealment]]
A hollow container, fashioned to look like an [[Eisenhower dollar]], is still used today to hide and send messages or film without being detected. Because it resembles ordinary pocket change, it is virtually undetectable as a concealment device.  If a hollow coin is suspected, it sometimes can be easily confirmed by weighing against a normal coin on a simple balance. However, more sophisticated hollow coins have had their weight adjusted to match an unaltered coin by including a ring of a dense metal such as lead inside the coin. Typically coins that have no gold or silver content are used so as to further avoid suspicion.

Such hollow coins were created from two ordinary coins, by [[Milling machine|milling]] out one face and the interior of both coins (to create a cavity), and the edges of one (so it could slide into the other). The half coin with intact edges would also have a pin-prick size hole drilled through its face, so the device could be opened by inserting a pin. A scratch may be added to help line up the faces while closing it&mdash;although it is very difficult to detect a slight misalignment by casual inspection. A device of this nature was famously discovered by a paper boy in the "[[Hollow Nickel Case]]". [[Lockheed_U-2|U-2]] pilot [[Francis Gary Powers]] was issued with a hollow silver dollar containing a tiny, [[saxitoxin]]-impregnated needle,<ref>{{Cite book |title=Unauthorized Storage of Toxic Agents |volume=1 |page=7 |url=http://www.aarclibrary.org/publib/church/reports/vol1/html/ChurchV1_0006b.htm |series=[[Church Committee]] Reports |publisher=The Assassination Archives and Research Center (AARC) |year=1975–1976}}</ref> to be used to [[suicide pill|commit suicide]] in case of capture by enemy forces.