Article
第六卷第五號懸賞披露 - Answers to the questions in volume 6, number 5
Image
第三題答案-幾何圖形 - Answer to the third question-geometric graphics
Subject matters: Illustrative diagram,
Medium: Line drawing
第四题答案配图 - Illustrations for the answer to the fourth question
Subject matters: Illustrative diagram,
Medium: Line drawing