Abstract: By the fastening device, two electric transmitters are to be arranged on a supporting structural part from which two extensions (11) protrude spaced from each other. For this purpose, one bored attachment end (15, 16) each of the two transmitters are arranged each on one side (13, 14) of one of the two extensions (11) on a threaded bolt (1, 2). The threaded bolt is screwed, with one collar (5, 6) each lying on both sides against the extension (11), directly to the latter. The attachment ends each have such a large recess (20 22) that they rest only on the extension without resting on the collars (5, 6). The threaded bolt (1, 2) is provided on the outside on both ends with a threaded section (9, 10). Nuts (25, 26) which are screwed on the respective threaded sections press in each case one of the two attachment ends (15, 16) against the extension (11).

Abstract: A holding device for mounting a shear strain gauge 14 in an airplane axle 1 in which the shear strain gauge 14 consists of a coil part 18 with two magnet coils 19 spaced apart from each other and of a disk part 20. The disk part 20 has a disk 21 which, in normal position, extends equidistant between the magnet coils 19. The holding device has two holding rings 16 and 17 arranged axially at a given distance from each other, the coil part being adapted to be fastened to the one holding ring 16 thereof and the disk part 20 to the other holding ring 17. The holding rings 16 and 17 are developed with radial resilience and with a smaller outside diameter than the inside diameter of the airplane axle. They have radially protruding holding lugs 23 which rest under initial spring tension against the inner wall of the airplane axle 1.