Abstract
The earliest seismoscope was invented in 132 A.D., by Chang Hêng. Seismoscopes of limited effectiveness were used by Bina and others in the eighteenth century. The middle nineteenth century saw the invention by Palmieri of a seismoscope to record the times of small earthquakes.
A successful seismograph of low sensitivity was invented by Cecchi in 1875. British scientists at the College of Engineering, Tokyo, independently built seismographs in the 1880's. The British in Japan made many observations with their instruments and must be credited with first demonstrating the value to seismology of seismographic devices.
Von Rebeur-Paschwitz obtained the first recording of a teleseism in 1889. In the next decade, investigators in Italy, Germany, and England studied the waves from distant earthquakes and constructed the first teleseismic travel-time charts. Weichert introduced a seismometer with viscous damping in 1898.
Theory seems to have been rather neglected in the early development of the seismograph. Theoretical studies of forced damped harmonic-oscillator seismographs were presented by Perry and Ayrton, and Lippmann, but these had little effect on the construction of seismographs. In the 1890's, the importance of tilt was much debated. By 1900, many seismologists had become convinced that the effect of tilting on seismograph response could usually be neglected.
