Also used in the past for burning  metal printing plates

-----Original Message-----
From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of
Lauren Cook
Sent: Friday, October 28, 2005 10:32 AM
To: [log in to unmask]
Subject: Re: Old Flashlight batteries

Carbon Arc Lamps

c. 1857-used in lighthouses
1877-1950s streetlights
Still found in some film projectors.

-----Original Message-----
From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]]On Behalf Of Ron
May
Sent: Friday, October 28, 2005 3:03 AM
To: [log in to unmask]
Subject: Re: Old Flashlight batteries


Archaeological investigations of a burned 1916-1919 United States Army
building at Fort Rosecrans, San Diego, California (CA-SDI-12,000)
exposed a
number
of carbon rods of various sizes. Although some were undoubtedly from
batteries, other larger ones were associated with search lights used for
coast
artillery sighting. I too have wondered how those were made and how long
the
technology has been around.

Ron May
Legacy 106, Inc.



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