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Old March 28th, 2013, 02:55 PM
gmc1963 gmc1963 is offline
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Join Date: Mar 2013
Location: Ft Worth Texas
Truck: 1963
Age: 41
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Default Re: GMC photos from history

modified suburban with 5th wheel from the us geological society

A Johnson Elevation Meter mounted in a four-wheel-drive GMC Suburban 1960 model K1001 truck. The slope angle of the road was measured by a sensitive electronic pendulum, and the distance was measured by the fifth wheel. An onboard computer solved for the difference in elevation ten times per second. In areas of moderate relief with an adequate net of relatively smooth roads, these instruments were capable of establishing elevations within 2 feet while traveling at speeds approaching 30 miles per hour.
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