Al Paslow Astronomy Collection
Images and events of personal interest.
John Dobson on April 1, 2006 attended Astronomy Day at the Carnegie Science Center, in Pittsburgh PA. He gave a talk in the Planetarium followed by questions and answers to a good number of interested people.
A telescope mirror grinding demonistration was next using a 12.5 inch mirror blank.
Mr.Dobson's final stop was to tour Mingo Creek Park Observatory in Washington County PA.
Here are some images of the events:
A telescope mirror grinding demonistration was next using a 12.5 inch mirror blank.
Mr.Dobson's final stop was to tour Mingo Creek Park Observatory in Washington County PA.
Here are some images of the events:
Having placed the grit and water mix on an 8 inch sub-diameter tool it is time to begin the grinding process. Here John is lifting a 12.5 inch mirror blank to begin his grinding session.
Even though the mirror weight is over 20 pounds John had no problem with it.
Even though the mirror weight is over 20 pounds John had no problem with it.
Having placed the grit and water mix on an 8 inch sub-diameter tool it is time to begin the grinding process. Here John is lifting a 12.5 inch mirror blank to begin his grinding session.
Even though the mirror weight is over 20 pounds John had no problem with it.
Even though the mirror weight is over 20 pounds John had no problem with it.
Camera: Nikon (E990) |
More details: exif |
Original size: 2048px x 1536px |
Current: 400px x 300px |
in this box:This site features some great images.
