The burner flames can be adjusted. The characteristics, performance standards, and steps to achieve them are provided to the consumer!

This was the instruction set in 1947, when the system was identified as “Harper”.

In 1952, a name assigned to the system was changed to “Alltrol”.

This was the instruction set beginning in 1952, when the system was identified as “Alltrol”.

Here’s the little dealybobbers responsible for those signature “clicks” referenced in the materials. Over the decades, after repeatedly rubbing against the steel clip, the brass disc begins to show noticeable wear. Those valves are no longer made, so those springs and clips are no longer made. The clicking softens then disappears. The clicking is not, however, critical to the stove’s operation. It was just a cool marketing feature.