A detailed description is given of an apparatus which makes possible the propagation of ultrasonic pulses through very thin solid samples (foils, films, fine wires, whiskers, etc.). The apparatus includes means for mounting the sample, independent transducer supports, and means for bringing sample and transducer into nondestructive contact. Several sample holding devices and micromanipulator adaptations are described. The over‐all measurement system is briefly described together with a few typical results for metal foil and fine wire specimens. Some applications of the apparatus are listed.