Image:McLeod gauge.jpg

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[edit] Summary

An old McLeod gauge used for high precision measurement of vacuum. As shown, it has been drained of mercury. This gauge is on display in the lobby of the Science building at Winthrop University. The vacuum port is not visible in the photograph; it runs through the center bearing and opens on the far side. The left hand column is sealed off at the top; this is visible by zooming in on the picture. The gauge was rotated clockwise to reset and counterclockwise to measure. Photo by Yannick Trottier, April 10th, 2006.

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I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation license, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation license".

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Date/TimeDimensionsUserComment
current03:36, 10 April 20061,712×2,288 (546 KB)Ytrottier (An old McLeod gauge used for high precision measurement of vacuum. As shown, it has been drained of mercury. This gauge is on display in the lobby of the Science building at Winthrop University. The vacuum port is not visible in the photograph; it runs th)
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Metadata

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 OLYMPUS CORPORATION
Camera model C770UZ
Exposure time 1/30 sec (0.033333333333333)
F-number f/4
Date and time of data generation 04:47, 10 April 2006
Lens focal length 6.5 mm
Image title OLYMPUS DIGITAL CAMERA
Orientation Normal
Horizontal resolution 72 dpi
Vertical resolution 72 dpi
Software used v772-79
File change date and time 04:47, 10 April 2006
Y and C positioning 2
Exposure Program Creative program (biased toward depth of field)
ISO speed rating 64
Exif version 2.2
Date and time of digitizing 04:47, 10 April 2006
Image compression mode 2
Exposure bias 0
Maximum land aperture 3
Metering mode Pattern
Light source Unknown
Flash 25
Color space sRGB
Custom image processing Normal process
Exposure mode Auto exposure
White balance Auto white balance
Digital zoom ratio 0
Scene capture type Portrait
Contrast Normal
Saturation Normal
Sharpness Normal