The archive contains a plethora of material. Original Artwork in different formats, namely a collection of 14 original sketchbooks with numerous original colored drawings, approx. 540 original pencil drawings, 16 original water colored pencil drawings, 24 original watercolors, 15 original ink drawings, 32 original pencil ink drawings, 18 original watercolors, 79 original etchings, partly in aquatint, 30 manuscript pages of notes, 4 original oil studies and 3 photographs. Sheet dimensions from approx. 4 x 8 inches to approx. 22 x 26 inches. The archive includes manuscript cost calculations and numerous, partly large-scale construction drawings for the restoration work at the town hall Bülach. With his keen sense and appreciation of history, the Swiss architect Rordorf was an attentive observer of Swiss culture. As a result of the restoration work based on his designs at the town hall Bülach (around 1905) and in the Castle Greifensee (historic room conversions 1917) he drew the attention of the Swiss public to his work. Also, architectural and floor plan drawings, beautiful views (between 1876-1933) of Switzerland, including Bremgarten, Dübendorf, Effretikon, Lugano, Freiburg, New Bechburg, Thierstein, Bern-Thun, Mariastein, Aarberg, Castle Burgdorf, Kyburg, Locarno, Arbon, Brugg, Zurich, Erlach, as well as Italy, France and Germany. Documents include announcement and invitations and manuscripts of the Société "On the Wall" in Zürich, manuscript letters, poems, purchase contracts and dividing documents between David and Paul Rordorf, etc., as well as a district plan of the city of Zurich. Rordorf-Mahler was a member of the Zurich Artist Society, the Swiss Association of Engineers and Architects, the Société "On the Wall" in Zurich, and at times its President. All in all, an impressive archive of original drawings and at the same time, an important primary source material for the history of architecture in Switzerland. Manuscript
