Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 130
02, and step off 02 six times from o to o. Bisect theselengths, thus obtaining twelve equal divisions, each equalto one of the twelve equal arcs round the circle. As the circle rolls to the right, the points of divisionon its circumference occupy, in turn, the positions indi-cated by the… … Ok For example, when rolling takes place, the point 2descends to 2, and at the same time the tracing-point J}ascends to the level indicated by the dotted line through 2. But 2P.Z- chord 02, hence the construction is asfollows:— Take the points o, 1, 2, . . . 6, in turn, as centres,and describe arcs…
