'Danger Lights' in 'Milwaukee Magazine', October, 1930

There is a long well-illustrated article about "Danger Lights" that I just found in "Milwaukee Magazine" from October, 1930.
Here is the link:
http://tinyurl.com/25m8gav
You'll have to copy and paste the link.
When you get to the webpage, keep scrolling down for more of the article which goes until about page 5.
There are lots of behind-the-scenes photos and information.