Roughness of uncoated and that of coated paper surface was studied with special emphasis on the effect of deformation under printing pressure. A newly desingned pneumatic on the effect method was employed to measure the roughness under compressive stress. Results obtained are as follows;
1) The velocity of air flow rapidly decreases as the compressive stress increases in uncoated paper. The velocity approach to a constant value for the compressive stress more than 60/cm².
2) Similar relation between the velocity of air flow and the compressive stress was found also in coated paper. The compressive stress required to saturate the velocity of air flow was estimated as 35g/cm² or more.
The compressive stress can be regarded as an important index for the determination of printing pressure.

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Transformation of surface, back, and innerside of paper under the compressive stress were studied with their resistance to air flow. The velocity of air flow were separately measured about the paper which was covered one or the other side by contact sheet. The deformation of these three sides caused by the compressive stress were respectively estimated by the change of the velocity of air flow.
The velocity of air which flows between the paper surface and polished metal plate with etched helical lines which act as air path was compared with that flows between the paper surface and polished flat metal plate to obtain the quantitative value of roughness of paper surface.
The roughness thus numerically expressed in this study was estimated as about a half of the value calculated by the cross sectional profile which obtained by the contact needle type surface rughness meter.

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IIで報告した4-アジドジフェニルアミン-2-スルホン酸とホルマンの縮合物は水現像できる感光材料として使用し得るが, 分子中のスルホン基の強い親水性のため, 光硬化皮膜が湿し水の存在で印刷インキを受着しない。従ってオフセット版用の感光材料として使用することができない。
本研究では類似の構造でスルホン基がカルボキシル基に変った4-アジドジフェニルアミン-2-カルボン酸とホルマリンの縮合物を合成し, その感光性および製版適性について検討し, さらに縮合体の構造に関する研究を行なった。

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