Image:
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u.sid

Compression:
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File type: 		TIFF
Input filesize:  	111.77 MB
Output filesize: 	3.73 MB
Zoom Resolution Levels:	
	0.............  300.0 dpi
	1.............  150.0 dpi
	2.............   75.0 dpi
	3.............   37.5 dpi
	4.............   18.8 dpi
	5.............    9.4 dpi
	6.............    4.7 dpi
Compression ratio:  	29.97 to 1 
Compression time:	18:31:58 

Machine: 200 Mhz Pentium PC with 64Mb RAM

Image: 
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Original Dimensions:	18 x 29.6 inches 
Resolution:		300 DPI

A double page map in Mitchell's "New Universal Atlas" published in Philadelphia in 1851.  

Copyright:
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Image copyright and courtesy of Cartography Associates.

Notes:
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The image was photographed with the PhaseOne Powerphase 4x5 Digital Camera back. The Powerphase has a resolution of 8400 x 6000 pixels. Required four and two shots respectively by the Powerphase camera back.