A Pennsylvania Slate Industry Timeline

The following information has been taken from both primary and secondary sources with a link to the sources provided. Some of the information is contradictory which is common in historical research. The data is provided as a way to allow you as the viewer to draw your own conclusion.

To activate the timeline click on OK in the center of the view below. The time line can be advanced by clicking on the arrow to the right side of the view and can be reversed by clicking the arrow to the left. Any event can be selected directly from the timeline at the top.

To open the timeline in a full width window CLICK HERE.