The moon suffers the interposition of the opaque earth.
The crucibles or pots used for the production of optical glass very closely resemble those used in the manufacture of flint glass for other purposes; they are " covered " and the molten materials are thus protected from the action of the furnace gases by the interposition of a wall of fireclay, but as crucibles for optical glass are used for only one fusion and are then broken up, they are not made so thick and heavy as those used in flint-glass making, since the latter remain in the furnace for many weeks.
They came over with William the Conqueror and settled at Kilravock in 1293, since which date son has succeeded father without the interposition of a collateral heir, an instance of direct descent unique in Scottish history.
We have already alluded to the interposition of new members in a whorl.
By means of a rotating table either two surfaces of glass, or one surface of glass and one of cast iron, are rubbed together with the interposition of a powerful abrasive such as sand, emery or carborundum.