Instruction Manual Geophysical Specialties Company, Minneapolis ... The electronic and mechanical construction of the MD-1 Seismograph is of the soundest possible design, and will require relatively little maintenance. ... Depress the reset switch for a second or more. ... If operation is normal, the 128 ms. light will cycle aquot;Onaquot; at the rate of 4 times per second; use a watch to establish that the rate isanbsp;...
|Title||:||Engineering Seismography, Model MD-1|
|Author||:||Geophysical Specialties Company, Minneapolis|