An apse is a semicircular recess covered with a hemispherical vault. The ammunition used a cylindrical bullet with hemispherical depressions at both ends. These airbags are usually cylindrical in shape with hemispherical heads at both ends. The mine is cylindrical with a hemispherical top and flat bottom. Those for the hemispherical and cylindrical menisci are shown below. The lower shell is covered with hemispherical protrusions. His boilers worked at and were at first of hemispherical then cylindrical form. The design utilises eight triangular panels that are joined to form a hemispherical skullcap. Symmetrical spinnakers have large amounts of camber, making them nearly hemispherical. This mushroom has an orange-red cap, initially hemispherical before convex and finally flat. Upon oviposition, the eggs are pale white, oblong, hemispherical, and ribbed. The ends of the drums extended outside the casing as hemispherical domes. This creates what is known as a low hemispherical shaped chamber. If illuminance is interpreted loosely, measurements with a hemispherical sensor indicate "scene illuminance". An engine featuring this type of hemispherical chamber is known as a hemi engine.