Niobium-tin compacts have been produced by pressing and sintering the powdered elements. Tube magnetization experiments on the material at 4.2°K in fields of up to 54 kOe have yielded results that are consistent with the relation J_c = α_c/(H + B₀), where J_c is the critical current density in a local magnetic field H and α_c and B₀ are constants. The highest critical current density to date has been achieved by pressing at 30 ton in^-2 and sintering at 975°C for 3 hours; the values of α_c and B₀ for niobium-tin prepared in this way are 4 × 10⁶ kOe A cm^-2 and 4 kOe respectively. The material is notable in that it seldom exhibits flux jumps; it is thought that this feature of its behaviour is due to the presence of liquid helium in the interconnected pores. The absence of flux jumps indicates that the material can be used in the construction of mechanical flux compressors and the design of a flux compressor, which can yield 50 kOe in a working space of 1 cm diameter, is discussed. Preliminary experiments on flux compression up to a field of 23 kOe have given results in accordance with the theoretical predictions.