The Continuity Guide
Moonbase Guide
by Martin Willey

Forcefield Towers

"Now, as you know, these eight anti gravity towers stabilise our gravity here inside Alpha. Now, we're going to use them to create an entirely new force field effect. By linking and cross linking the anti gravity screens in each of the towers, the force field will look something like this." (Victor Bergman in Black Sun)

After Black Sun the gravity towers are often seen, both as full size studio props and in model shots.

The tower first appeared in Nuclear Disposal Area 1, with a different top section, in Breakaway. The area is said to have had an artificial gravity system; presumably this is it.	The towers are first introduced in Black Sun. Bergman shows their positions on this model.	A close up of a tower on Bergman's model
The actual tower	The tower was also built as a full-scale prop.	Radiating the forcefield.
Later in the series the towers changed colour, from red to white.	The ends of the forcefield lines do not match Bergman's model, and do not cover the outlying areas of the base.	They also don't match precisely shot from shot.
	There's a white gravity tower in Santa Maria, California, Earth, in Another Time, Another Place.	A red full sized prop in Alpha Child
Full sized prop with background painted towers from The Last Sunset	Bringers Of Wonder part 1: a white gravity tower between the base and a launch pad.
The tower models were reused as revolving antenna on the round building foreground right during the title sequence.	The Metamorph: The gravity tower appears as another revolving antenna.