The “add-a-link” ring is made up of a series of small links which all snap one in the other. The purchaser buys one with the number of links requisite to fit the finger exactly. If he wishes to have a stone in it he buys a link with a stone inserted therein. A plain link is snapped out of the ring and the link with the stone is snapped in. Sometimes these rings are made up of a variety of stones and then again with only one stone. It is possible in this way for the purchaser to obtain, at a moderate cost, a variety of settings, changeable at will. Moreover, a ring of this type can be enlarged as the finger grows larger. Among a number of ring-types designed for the practical convenience of the owner and only worn temporarily to serve a particular purpose, we may note the cigarette ring, provided with a straight sliding rod the end of which clasps the middle of a cigarette, so that when a whiff has been taken, the hand may be freely used without laying aside or dropping the cigarette. Another smokers’ ring is one provided with a projection for stopping a pipe, rendering it possible for the ardent pipe-smoker to keep his pipe-bowl well filled and well packed without soiling the tips of his fingers. These pipe-stopping rings are sometimes of rich materials, in one instance the stopper was of a beautiful white zircon, finely contrasting with the rich yellow gold of the ring proper. Rings of this kind were very much in vogue in the eighteenth century, and one appears on the hand of a gentleman in one of Hogarth’s engravings. The name “swivel ring” is applied when the head of the ring is loose, and is loosely secured by a bar to the band or circlet, so that the ring will swing around. This type is frequently used in scarab rings, or where there is a double intaglio, a double miniature, or other double object, or where the ring is what is known as a concealed seal ring, the outside part being a gold ornament or a stone. One of the “surprise rings” in which a hinged outer section of the hoop can be made to detach itself, on a spring being pressed, so that a concealed surface appears, shows on its hidden surface a number of magical signs and the names of the angels or spirits Ashmodel, Nachiel, Zamiel, and others. Wearing a ring of this kind, the adept could reveal his belief in the magic arts to others of his sect or fraternity, thus bearing about with him a secret passport admitting him to their confidence.[153]