1976 年 29 巻 2 号 p. 127-135
A new type of the ink-writing recorder for the continuous obsevration of earthquakes is developed. Main principles of this recording system are as follows.
1. Recording paper size is as same as a standard from of the line-printer system of the computer.
2. The recording paper is feeded by the similar method as the line-printer system.
3. Two pen-galvanometers are drived at right angles to the feeding direction of the recording paper.
4. The same signal that is recorded at the ending part of a line by one galvanometer is recorded at the beginning part of a next line by the other galvanometer.
By these principles the recording pattern on the paper is designed to be convenient for analyses. Recorded papers by this new recording system are efficiently stacked in the standard shelves, easily used and can be conveniently copied.
Using one case of standard recording paper which has two-thousands pages, continuous observatition of about five months can be done if the recording speed is 4mm/sec, the interval of recording lines is 2mm and the signal for two hours is recorded on a page.
Various applications can be utilized by controlling the paper feeder by the trigger signals from the seismic waves.