Abstract
An accelerometer for use on aeroplanes was designed and constructed at the Oosaka Branch of the Central Meteorological Observatory to investigate the turbulence or gustiness.
1. A direct reading accelerometer-is a simple instrument, having two pendulums each supported by a piano-wire. The instrument is put in a small box. This is used for a preliminary investigation of the period of vibration of aeroplanes caused by gusts.
2 An accelerometer with an air damper.-Tbe constants of this instrument are as follows: proper period T0=0.17sec, damping ratio υ=5.4, geometrical magnification V=3.41, statical deviation for the acceleration of 1g=26.7mm, coefficient of friction r=0.4mm_??_0.1mm.
The record is obtained automatically with a smoked paper. A steel flat spring is used to give resistive force for an oscillating part having a mass of lead. The writing pen is made of a thin steel wire stuck on the end of the oscillating part, The air-damper consists of a piston with several small holes through which the air escapes.
