Wilson Hole (left) & William C. Miller in the elevating platform taking pictures of the 200-inch telescope prime-focus cage, Palomar Observatory. both men have their backs to the camera, and both are wearing coats; Miller is wearing a hat.
Upstream core drill hole Dam 1. U-s station 10+62.7. Elevation 6898.9. This hole is in column of concrete near gate house which shows evidence of different mix than surrounding concrete on upstream face.
Core drill hole upstream face Dam 1. U-15. Most easterly hole drilled and highest in elevation of any of the 16 holes drilled in the upstream face. Station 3+60.9 Elev. 6630.5.
Big Creek, Huntington Lake Dams - Copy of Page 12 of Stone & Webster Report on Backfills on Dams at Huntington Lake: 42. Drilling 30' grout holes. 43. Grouting 30'grout holes. Blow pipe in hole in foreground. 44. View of grouting connections. ...
The 100-inch mirror and hoisting device, resting on a raised platform above the silvering hole, Mount Wilson Observatory. The interior balcony and walls of the observatory are seen in the background.