"Cup shake" is a natural splitting in the interior of the tree between two of the annular rings.
Below the piston of the upper cylinder is an annular space E (surrounding the common piston rod) with a capacity equal to the maximum displacement of the liftram, while the corresponding annular area C of the piston of the lower cylinder is just large enough when subjected to the working water pressure to enable the work of lifting the net load to be done and any friction to be overcome.
Within this is hung loosely a second tube of much smaller dimensions so as to leave an annular space between the two.
to add to the fairly uniform distribution of stars between two planes a gigantic cluster of an annular or spiral form, also lying between the planes and completely surrounding the sun.
deep is surrounded by an annular stone pavement about 7 ft.