Update README.md

README.md

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 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/overall.jpg' height=450px>
+<img src='img/tank.jpg' height=450px>
 
 
 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>
+<img src='img/lps-warmup.jpg' height=220px>
+<img src='img/first-fringes.jpg' height=220px>
 
 
 ### First videos