Update README.md

README.md

 ## Soap film wind tunnel
 
 
-<img src='img/overall.jpg' height=300px>
-<img src='img/tank.jpg' height=300px>
+Reservoir of soapy water at the top, needle valve to control flow, monofilament line forms the rails.  Solution is collected at the bottom and pumped back to the top.
 
+<img src='img/overall.jpg' height=500px>
+<img src='img/tank.jpg' height=500px>
 
-<img src='img/lps-warmup.jpg' height=300px>
-<img src='img/first-fringes.jpg' height=300px>
 
+I first tried single color power LEDs to see interference fringes.  I didn't observe very clear fringes.  Then I switched to a low-pressure sodium lamp.  I saw very clear fringes.
+
+<img src='img/lps-warmup.jpg' height=250px>
+<img src='img/first-fringes.jpg' height=250px>
+
+
+### First videos
+
+line
 
 <img src='vid/line-small.mp4'>
 
+finger
+
 <img src='vid/finger-small.mp4'>
+
+I need to fix the flicker from the ballast for my low pressure sodium lamp.
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