double concave

At one end is a black granite fountain with a double concave shape.

But the double concave in the middle will always sit higher than the single concave.

The problem was successfully fixed, but the experience caused the government yards to adopt the double concave design for the next several years.

The front-end's "double concave architecture" can also be characterized by its protruding hood crease line and deep grille.

A bonzer is a variety of surfboard created by the Campbell Brothers with three or five fins with double concave channels.

The Bonzer array is firmly held to be an integral part of the Campbell brothers' overall board design featuring double concave bottom contours out the tail.

'I had to call an automobile race car body manufacturer to make these double concave pieces which were very difficult to fashion from the second hand pattern we had.

For instance, a double concave in the middle and a single concave in the tip and tail keep the wakeboard riding higher in the water overall.

Made from epoxy and carbon fiber wrapped around an expanded polystyrene core, Ultra Cat is 12 feet, 4 inches long and has a double concave bottom with edges slightly tucked under.

For a double concave lens where the rays are diverged, the principal focal length is the distance at which the back-projected rays would come together and it is given a negative sign.

This use of light may support speculation among art historians that Vermeer used a mechanical optical device, such as a double concave lens mounted in a camera obscura, to help him achieve realistic light patterns in his paintings.

Taylor's trademark brand of power surfing led to an uncommon surfboard design in 2012 when he worked with Al Merrick to create the Channel Islands Dagger; a surfboard with an abnormally deep double concave and downturned rail.