The Teeth of a Beast
![Gear on the 140-foot telescope](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-large140elgear_large.jpg)
To tilt up and down, the 140-foot (43-meter) telescope in Green Bank, West Virginia rides on an enormous toothy gear. The 42-foot diameter gear is bolted to the back of the dish’s superstructure. Two brass pinions engage this bull gear. The brake, which you can see to far right, is one of several designed and built by Goodyear Tire and Rubber Company.
Credit: NRAO/AUI/NSF
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