  Samuel Heinrich Schwabe made 8486 drawings of the solar disk with sunspots in
the period from November 5, 1825 to December 29, 1867. We have measured sunspot
sizes and heliographic positions on digitized images of these drawings. A total
of about 135,000 measurements of individual sunspots are available in a data
base. Positions are accurate to about 5% of the solar radius or to about three
degrees in heliographic coordinates in the solar disk center. Sizes were given
in 12 classes as estimated visually with circular cursor shapes on the screen.
Most of the drawings show a coordinate grid aligned with the celestial
coordinate system. A subset of 1168 drawings have no indication of their
orientation. We have used a Bayesian estimator to infer the orientations of the
drawings as well as the average heliographic spot positions from a chain of
drawings of several days, using the rotation profile of the present Sun. The
data base also includes all information available from Schwabe on spotless
days.
