[AT] Slow Day

[Brian Lesh]

When they tested in our area using explosives my brother collected the 
wire they used to detonate the charge down the holes.  We spent hours 
untangling and winding it up on rolls.  He was going to make a telegraph 
line to the neighbors house a mile away.  Didn't happen but did have a 
line between our bedrooms.

Brian CO

On 7/25/2020 9:47 PM, Phil Auten wrote:
>
> The thumpers, or as Geophysical Services Inc. called them, stompers, 
> replaced the use of explosives for taking readings of what was down 
> below the surface, particularly oil, and possibly natural gas. GSI was 
> a division of Texas Instruments where I worked from 1968 until 1987. 
> We occasionally had articles about what they were doing in our company 
> newsletter.
>
> Phil in TX
>
>
> On 7/25/2020 7:44 PM, Howard Pletcher wrote:
>> Very interesting. Thanks for your info.  When I was at IH/Navistar, I 
>> know some trucks were used as thumpers, but had no idea just what 
>> they did--and after a little searching, now see what is being done, 
>> but still don't begin to understand how it tells the geologists 
>> anything.
>>
>> Where are the trucks you worked with built?  What engine powers them?
>>
>> I am continually amazed by the wide variety of expertise accumulated 
>> by us "dumb farmers that play with old tractors", haven't seen any 
>> brain surgeons on here yet, but I wouldn't be surprised if one pops 
>> up.  Very interesting group.
>>
>> Howard
>>
>> On Sat, Jul 25, 2020 at 1:08 PM ustonThomas Mehrkam 
>> <tmehrkam at sbcglobal.net <mailto:tmehrkam at sbcglobal.net>> wrote:
>>
>>     The ones we used in the vibrator trucks were rated for over 300
>>     hp and cost only $32,000 each.  We used them to make it easyier
>>     to control the spacing between trucks.  Had ultrasonic sensors to
>>     measure the distance between the trucks.  They operated as an
>>     array and spacing was important.  Some array designs had
>>     different spacing between each truck.
>>
>>     The hydrstatic transmission was much easier to precisely control
>>     spacing between trucks. Three to five trucks in an array was
>>     common and there would be multiple fleets of trucks that would
>>     stop shake the ground then pull up the pad and move forward to
>>     the next shot point.  While they were moving another fleet would
>>     shake the ground.  Speed things things up a bit.
>>
>>     The older trucks were built on Mac Truck chases with normal
>>     transmissions. Not having a drive shaft from the front and rear
>>     drive allowed putting a bigger vibrator in the middle to get more
>>     signal.
>>
>>     In the US the wheeled version is common. Some places use the
>>     tracked version.
>>
>>     This is the company I use to work for. The name changed many
>>     times.  When I joined the name changed to Geosource that was the
>>     name it was know by for many years.
>>
>>     https://www.inovageo.com/products/category/source-products/vibrators
>>
>>     Seismic Vibrator truck <https://www.youtube.com/watch?v=8EVilzqcggk>
>>
>>
>>     	
>>
>>     	
>>
>>
>>         Seismic Vibrator truck
>>
>>     <https://www.youtube.com/watch?v=8EVilzqcggk>
>>
>>
>>
>>
>>
>>
>>
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>
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