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