Mathematical Instruments
Mechanical Instruments for Drawing, Measuring and Integrating
Drafting Instruments
Hommel-Esser Aarau
Kern & Co. Aarau
Gysi & Co. Aarau
J. Bossart Suhr-Aarau
G. Coradi Zürich
Haag-Streit
Various Makers
Drafting Set
Proportional Divider
Transvere Map Scale (F. Kuhn)
Ellipsograph (Pat. H. Sieber)
Elliptical Compass (Scholl)
Ellipsodem (Racher)
Planimeters and Integrators