MICROBAROGRAPH Russian patent published in 1996 - IPC

FIELD: medicine. SUBSTANCE: device has barometric transducer having hollow spheres 4 with vertically set capillary tubes 5, fixed on one end of rocking shaft 3 suspended with elastic threads 2 from frame 1. Counterbalance 6 made in the form of shutter of photoelectric transducer is mounted on the other end. The device also has measuring spring 11, compensation spring 10 and recorder 13 coupled with the photoelectric transducer. Measuring spring 11 and compensation spring 10 are manufactured from the same material. The springs are mounted on the opposite shoulders of rocking shaft 3 in symmetric relation to suspension threads 2. The springs have equal elastic moments of opposite direction relative to suspension threads 2 which are not twisted in the initial position. Capillary tubes 5 of hollow spheres 4 have different diameters. EFFECT: wider range of measurements; compensated zero drift. 1 dwg