A technique is described which makes use of Bragg reflection of x‐rays to give a “picture” of the vibration pattern on the face of a crystalline plate. The dependence of this pattern on the direction of the x‐ray beam is illustrated, and a comparison between dust patterns and x‐ray patterns for a vibrating bar fairly well establishes that the local curvature of the crystal is responsible for the observed increase in x‐ray reflection. Reference is made to quantitative measurements on statically bent quartz and to an approximate theory treating the effect.