planoconvex การใช้

The test is trochospiral and planoconvex, with a broadly rounded periphery and about six to nine chambers in the final whorl.
A field flattener, in its simplest form a planoconvex lens in front of the film plate or detector, is sometimes used.
The test is planoconvex to lenticular, trochospiral, with three to four gradually enlarging whorls, seven to eight chambers in the final whorl.
Although ingots of any sort are not common in the British Iron Age, planoconvex or bun-shaped ingots are not unknown-e . g . a tin ingot which was discovered within the Iron Age hillfort at Chun Castle, Cornwall ( Tylecote 1987, 204 . ).