Juliahnna's Concrete Arrows

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Across
  1. 6. of the first attemps to overcome this was to light ____
  2. 8. arrows were painted bright ____
  3. 9. The beacons featured a 50 foot tower with rotating ___
  4. 10. clear weather the beacon lights could be seen from 10 miles ___
Down
  1. 1. than 100 years ago pilots had to trust a___
  2. 2. the 1860 the Pony Express revolutionized transcontiental ___
  3. 3. the 1940's the arrows were already becoming out of ___
  4. 4. The U.S. postal service was ____ by this
  5. 5. arrows were 50 feet and 70 feet ____
  6. 7. the center of each arrow was a 50 foot ____