An absorbent composition that is useful in the selective removal of hydrogen sulfide relative to carbon dioxide from gaseous mixtures that comprise both hydrogen sulfide and carbon dioxide and the use thereof. The partial product reduction tree will generate carry results and provides a final output to a final adder 470 connected to the partial production reduction tree. Change in resistivity of those layers due to spring deformation during mirror motion is measured and related to the mirror deflection angle. Furthermore, respective spring constants of the first spring and the second spring are set in such a manner as to establish the relationship of >> when pressing force for pressing the touch ball toward a main body shaft acts.