| Each dredge would then be tipped inboard and the scallops emptied by pulling a line over the emptying derrick from the base of the dredge. |
| Furthermore, an additional bending moment in the derrick is prevented by the topping lift tackle acting on the crab. |
| Today, two derrick cranes will move the heavy reactor and its related equipment to a trailer with 360 wheels on the pier. |
| Hoisted on a makeshift derrick, the cob was taller than the angler who had taken it. |
| A 350 ft derrick will support the six-mile drill pipe, which could take more than a year to drive through the crust. |
| The derrick cranes being used for erection were then moved forward to the next segment and the cycle was repeated. |
