Do any of you know what this is and/or what it fits and/or how do I sell it? It says Drillograph on it. Thanks
If you google "drillograph", you get three pages of results, and they all seem to have someting to do with recording well drilling activity. Does that help?
Looks like it's a Drillograph weight indicator used in well drilling. Anyone use these or know of anyone that wants to buy it?
I e-mailed my uncle last night to ask him, as him and my grandfather had been drilling wells for over 50 years. Here is the information he gave me. Basically it is an instrument for checking deviation from a perpendicular drillhole. In the days before horizontal drilling was common the drillhole could be made to angle away from being straight by the use of a "whipstock" Commonly a piece of steel casing that one side was cut away and the other side angled a bit to cause the tools to go a bit crooked. It was used by cable tool drillers such as we had to drill around a string of stuck tools so they could be loosened up and fished out of the hole. There were other uses that were somewhat more sinister such as drilling on someone elses lease. Later used by rotary drillers for the same purposes but some what easier due to rotation drilling rather than the churning action. That was limited to a few degrees because of gravatational pull which tended to make the tools fall straight. The instrument could be run into a drillhole to indicate just what angle the hole was going. Also used to ensure the hole was straight. It worked much better than the cage that many large diameter holes were checked with. I never saw one but have read about them. I guess you could call it a high tech plumb bob. Once drilling became computerized many instruments were invented that informed the driller of what was happening deep below the surface. Another similar item would be the inclineometer that some dirt pushers used to know beforehand that they were on a steep grade and could turn over. Trbo