Apollo Gnomon

[trebor]

Query: Does anyone know the dimensions of the Apollo Gnomon, specifically the size and weight of the vertical bar used to show the local vertical?
I am curious if it would be possible to use it to calculate the gravity where it is viewed swinging as a pendulum...

[Apollo Gnomon]

I should know this . . .

[Apollo Gnomon]

www.nasaimages.org/luna/servlet/detail/nasaNAS~5~5~21702~126457:Schmitt-Covered-with-Lunar-Dirt

"A gnomon is atop the large rock in the foreground. The gnomon is a stadia rod mounted on a tripod, and serves as an indicator of the gravitational vector and provides accurate vertical reference and calibrated length for determining size and position of objects in near-field photographs. The color scale of blue, orange and green is used to accurately determine color for photography. The rod of it is 18 inches long. The scoop Dr. Schmitt is using is 11 3/4 inches long and is attached to a tool extension which adds a potential 30 inches of length to the scoop."

There were 2 major versions of the gnomon, but it seems they were all a bit different. Early version had color bars on the stadia rod only, later versions had color bars on the leg and greyscale on the upright.

www.nasm.si.edu/collections/artifact.cfm?id=A19810890000
www.hq.nasa.gov/alsj/tools/tools37.jpg
www.hq.nasa.gov/alsj/tools/judy55.gif

Here's one version of the "pendulum" video, just to get the data into one place.
www.youtube.com/watch?v=r8va4efeqfc

[trebor]

Apr 1, 2011 12:17:55 GMT -4 Apollo Gnomon said:

www.nasm.si.edu/collections/artifact.cfm?id=A19810890000

A great picture of it...
Is that the weight visible at the bottom there?