File:Cooke and Wheatstone electric telegraph.jpg

Size of this preview: 475 × 599 pixels. Other resolution: 2,420 × 3,052 pixels.

Original file ‎(2,420 × 3,052 pixels, file size: 2.15 MB, MIME type: image/jpeg)

This file is from a shared repository and may be used by other projects. The description on its file description page there is shown below.

This image appeared on Wikipedia's Main Page in the Did you know? column on 23 February 2013 (see archives).

Wikipedia

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Thumbnail	Dimensions	User	Comment
current	04:57, 13 December 2011		2,420 × 3,052 (2.15 MB)	Rotatebot	Bot: Image rotated by 270° (EXIF-Orientation set from 6 to 1, rotated 0°)

The following file is a duplicate of this file (more details):

The following 2 pages use this file:

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Camera manufacturer	Canon
Camera model	Canon PowerShot G9
Exposure time	1/60 sec (0.016666666666667)
F Number	f/2.8
ISO speed rating	200
Date and time of data generation	16:59, 5 October 2007
Lens focal length	9.036 mm
Orientation	Normal
Horizontal resolution	180 dpi
Vertical resolution	180 dpi
File change date and time	16:59, 5 October 2007
Y and C positioning	Centered
Exif version	2.2
Date and time of digitizing	16:59, 5 October 2007
Meaning of each component	Y Cb Cr does not exist
Image compression mode	5
APEX shutter speed	5.90625
APEX aperture	2.96875
APEX exposure bias	0
Maximum land aperture	2.96875 APEX (f/2.8)
Metering mode	Pattern
Flash	Flash fired, auto mode, red-eye reduction mode
Supported Flashpix version	1
Color space	sRGB
Focal plane X resolution	13,745.704467354
Focal plane Y resolution	13,698.630136986
Focal plane resolution unit	inches
Sensing method	One-chip color area sensor
File source	Digital still camera
Custom image processing	Normal process
Exposure mode	Auto exposure
White balance	Auto white balance
Digital zoom ratio	1
Scene capture type	Standard