9697. Pulbrook, A. April 15. Tyres, pneumatic; felloes or rims. - Relates primarily to means for forming the air joint in tubeless tyres, and for attaching tyres of various forms, reference being made to Specification No. 8696, A.D. 1896. Fig. 1 shows an arch-shaped outer part G having inextensible edges M which rest upon an air cushion, preferably divided into three parts K, K<1>, K<2>, placed between the edges and the rim J. The air joint between the edges and the air cushion is formed by inflating the archshaped part. In Fig. 4, each edge M contains an extensible hoop M' and an inner airtight compartment K<7>, between which and the air cushion K the air joint is formed. Fig. 8 shows the tyre formed from a strip of material Q which is wrapped round and is held to the rim J by a band M<2> clamped thereto. One edge T may have a thickened part which is forced by the air pressure into a corrugation in the rim. In Fig. 10, the clamping- band M holds a strip of material Q to which is hooked or otherwise secured the outer part G, which may be inflated in the ordinary manner. This outer part may have an air chamber K<10> in each edge, as shown in Fig. 12, the strip Q being provided with ribs Q<1> which are forced, by the air pressure in the main air tube, against the corrugated rim. In a modification, the tyre is attached by shark's skin which is fixed to the edges of the outer part and is arranged to take on to felt attached to the rim. Fig. 15 shows a part Q<5> of the tyre clamped between two L-shaped parts of the rim J, the edges Q<1>, Q' of the tyre being suitably joined. In Fig. 17, the edges of the tyre have air chambers K<12>and are secured, between plates J<4> and the edges of the rim, by bolts. In Fig. 19, each edge of the tyre has a wire V<1> whose ends slide in a sleeve V, their relative positions being controlled by an attached wire V<4> whose middle point is connected to the tyre as shown. Inflation of the tyre increases the distance between the point V<6> and the sleeve V and so brings the ends of the wire V<1> together. Fig. 20 shows each edge provided with jointed or pivoted plates P which are forced into the rim by inflating the tyre. In each case the circumferential joints lie preferably within the rim, the air joint being aided by the compound described in Specification No. 14,839, A.D. 1895, and a separate inner air tube may be employed. Laminated air chambers, such as are described in Specification No. 18,512, A.D. 1893, may be used in combination with the invention. A restraining- cover composed of two layers of fabric may be employed, the inner layer being cut on the cross and the outer layer being straight. The materials may be waterproofed by means of a mixture of rubber solution and the precipitate formed in treating balata with naphtha or the like.