Abstract: The invention concerns a spin-stabilized projectile provided with a metal band (4). The projectile comprises a projectile body divided into a front main portion (1) and a rear main portion (2). The main portions are joined at the stern part of the projectile by means of a joint (3). The band is soldered or brazed with its inner surface and front flank surface onto an essentially cylindrical surface (6) and a rearwardly directed annular flank surface (5) of a shoulder which is formed in the rear end of the front main portion and extends round the projectile and which preferably has a length which is the same as the width of the band.

Abstract: With the intention of achieving more stable combustion in solid-fuel ramjets, and particularly in the case of ramjets with spinning application, it is proposed that the inner surface of the ramjet fuel element (8) is provided with raised surfaces, or lands (14), preferably formed from the fuel element material. In one preferred embodiment, the lands (14) are straight and extend parallel with the longitudinal axis of the fuel element and have the same length as the fuel element. The tangenital component of the rotating gasflow generated by rotation, forces the peripheral part of the gasflow to pass over these raised surfaces (14), thereby generating standing, stabilizing vortices downstream of the raised surfaces.

Abstract: A method and a device for determining the charging condition of electric accumulators, wherein the potential variations at the electrolyte-electrode interface are time differentiated in order to determine the degree of gas development in said accumulators.

Abstract: The invention relates to a method and an arrangement for determining signals affected by disturbance or interference. The affected signals are continuously integrated, either directly or subsequent to suitable transformation thereof, from the very start of a measuring operation. The actual integration value is divided at determined time intervals with the actual measuring time which has elapsed at that moment from the start of said measuring operation. The quotient thus obtained is presented to an observer or a device which is arranged to interrupt the measuring operation when the value presented is substantially constant.