The use of heavy crane versus light weight derrick during tower construction is the issue to be discussed.    From LearnThat.org. 

The only access is either by helicopter or hoisted by a derrick from a boat small enough to maneuver close inshore.    From Wordnik.com.  [A Real Columbarium in the Pacific] Reference

Reply kevin derrick on December 14, 2008 said: hmm, it was some time ago that i visited but it was via Provenance on 16th and Fairmount.    From Wordnik.com.  [the divine lorraine « DESIGNPHILADELPHIA] Reference

The crane for hoisting goods is called a derrick, from this hangman.    From Wordnik.com.  [Character Sketches of Romance, Fiction and the Drama, Vol. 1 A Revised American Edition of the Reader's Handbook] Reference

The raising of the derrick was the signal for three hearty cheers, for this was a new era in the operations.    From Wordnik.com.  [The Lighthouse] Reference

The derrick was the same one used for the first abutment having been moved and set up during the construction of the intermediate piers.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

Reply kevin derrick on April 18, 2008 said.    From Wordnik.com.  [Rally for Parks « DESIGNPHILADELPHIA] Reference

Reply kevin derrick on January 14, 2009 said.    From Wordnik.com.  [Station Square and the Post Office « DESIGNPHILADELPHIA] Reference

Reply kevin derrick on January 21, 2009 said.    From Wordnik.com.  [Jewish American Museum « DESIGNPHILADELPHIA] Reference

Reply kevin derrick on December 23, 2008 said.    From Wordnik.com.  [Port Richmond’s PECO Station « DESIGNPHILADELPHIA] Reference

Reply kevin derrick on August 22, 2008 said.    From Wordnik.com.  [haunted places/forgotten spaces « DESIGNPHILADELPHIA] Reference

Reply kevin derrick on January 24, 2009 said.    From Wordnik.com.  [23rd & arch « DESIGNPHILADELPHIA] Reference

Reply kevin derrick on November 19, 2007 said.    From Wordnik.com.  [Uhuru « DESIGNPHILADELPHIA] Reference

I was rigging a kind of derrick to ease my sled up the sharp pitch from the crossing. ".    From Wordnik.com.  [The Rim of the Desert] Reference

At the top of the derrick is a pulley.    From Wordnik.com.  [Diggers in the Earth] Reference

In these works the tube was suspended from a derrick.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

Near at hand was the framework of a boring machine, or derrick.    From Wordnik.com.  [On a Torn-Away World Or, the Captives of the Great Earthquake] Reference

"Nope, I'm going to see if I can build a derrick," was the reply, so.    From Wordnik.com.  [Christmas Holidays at Merryvale The Merryvale Boys] Reference

A grab bucket of either of these types can be applied to any derrick.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

At left, an oil derrick on the outskirts of Taft continues to pump crude.    From Wordnik.com.  [Celebrating the Last Worst Oil Spill] Reference

A 60 H.P. portable boiler supplied steam for the derrick engines and a pump.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

Because I'd looked - when I looked up I saw the flames coming out of the derrick.    From Wordnik.com.  [Rig Blast Survivor: 'I Thought I Was Going To Die'] Reference

They saw the metal derrick melt from the heat, droop over and bend into the water.    From Wordnik.com.  [Rig Blast Survivor: 'I Thought I Was Going To Die'] Reference

She found the wrecked car, near the derrick, as Thompson and I found it, later on.    From Wordnik.com.  [The Last Woman] Reference

The derrick was moved along a track at the foot of the wall as the work progressed.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

derrick A handled the materials from the scows and derrick B handled the mixed concrete.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

As each box was filled, the next one smaller in size was swung into place with a derrick.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

The story of the wreck of the White Steamer on the rocks under the derrick remained untold.    From Wordnik.com.  [The Last Woman] Reference

For building the center and side walls the traveling derrick shown by Fig. 127 was employed.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

The blocks were molded on shore, shipped to the work on scows and set in place by a derrick.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

He threw the throttle wide open, and after another moment he saw the derrick loom before him.    From Wordnik.com.  [The Last Woman] Reference

Before the professor could reply there came a shout from the direction of the oil man's derrick.    From Wordnik.com.  [On a Torn-Away World Or, the Captives of the Great Earthquake] Reference

An ordinary derrick pile driver, with a 2,500-lb. hammer falling 18 ft., was used in sinking them.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

The gift shop sells souvenirs like a sterling-silver derrick charm (oceanstaroec. com/museum. htm).    From Wordnik.com.  [Stationary At Sea: Staying Where the Mighty Drills Have Fallen Silent] Reference

The steel forms were erected by hand in advance of the derrick, 20 ft. of form on each side at a time.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

It consisted of a platform mounted on wheels and of the same general construction as the derrick platform.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference

At left, a replica of the type of wooden derrick used at the Lakeview Gusher's well stands at the West Kern Oil Museum.    From Wordnik.com.  [Celebrating the Last Worst Oil Spill] Reference

Note the symbol of Morgan City's annual Shrimp and Petroleum Festival - a shrimp wearing a hardhat wrapped around an oil derrick.    From Wordnik.com.  [Despite Spill, Louisiana Remains Wedded To Oil] Reference

Lacking the energy to dive off an oil derrick or drive his car into a wall, he returned to Dallas to recuperate at his parents 'house.    From Wordnik.com.  [Healer Of Hearts] Reference

In connection with the derrick in the concrete side wall construction use was made of steel plate forms for the inside faces of the walls.    From Wordnik.com.  [Concrete Construction Methods and Costs] Reference