as shown in Fig. 36, is usually about 6 inches high with, generally, a flanged or outward curved top and a comparatively slender stem. A series of ribs was impressed by a mould on the stem whilst yet plastic. The stem was fixed to its bowl, heated till soft, and then gently twisted and, at the same time, stretched. The result was a twist, produced in exactly the same way as in a stick of candy—close at the top and gradually loosening toward the bottom. Near the foot, by the way, the spiral generally disappears entirely as the effect of the heating process necessary when the foot was joined to the stem. The bowl was almost invariably waisted, that is, its sides were bent inwards. The foot was folded and there was a characteristic lessening in the diameter of the stem as it neared the bottom, which the “puller” of toffee will readily understand.
Air-twisted Stems.—The air-twist probably began with a “tear.” The tear of the glass-blower is a bubble of air blown into the centre of a mass of molten glass, possibly at first by accident and afterwards by design, as a form of ornamentation. When the stem was
FIG. 7—AIR-TWIST STEMS.
(From the Rees Price Collection, by permission of the Connoisseur).
drawn out, the bubble elongated into a tube, and when the stem was twisted, the tube acquired a spiral shape. Now as the tube was filled with air, which had a different refractive capacity to the glass which surrounded it, the effect of the light falling upon it was to produce a kind of silvery radiance like that of quicksilver. The phenomenon is familiar to anyone who has ever plunged a substance like wool, which contains air-bubbles entangled among its meshes, under water. The bubbles are transformed into drops like quicksilver. So with the tear and the tube drawn from it in the air-twisted stem. Naturally the decorative potentialities of this phenomenon were speedily recognised and utilised, and the air-twisted stems are among the most characteristic and the most beautiful features of all old English glasses.
The bowls were usually of the same general shape as those with incised and ribbon-twisted stems. The earlier varieties are “waisted,” the later ones frequently assume the bell shape. They are often engraved, the early ones with the Tudor rose, with its five petals, while the later ones affect the Stuart variety with six petals. The earliest stems have necks and collars—there was considerable difficulty in joining the air-twisted stem on to the bowl without damaging the twist. Later varieties have necks only. The collars are sometimes knopped, i.e. have knobs attached, and the stems themselves are shouldered.
I have dealt at some length with the air-twisted stems, since this is a characteristic English variety, and one to which the brilliant English flint glass was specially adapted. Consequently the type persisted for a considerable period. The later varieties, however, achieve some little distinction by the adoption of the bell-shaped bowl.