  We present solar full-disk observations, which were recorded at the Einstein
Tower during the years 1943 - 1991 (Solar Cycles 18 - 22). High-school students
from Potsdam and Berlin digitized more than 3500 full-disk images during two-
to three-week internships at AIP. The digital images cover a 15 cm $\times$ 15
cm region on photographic plates, which were scanned at a resolution of 7086
$\times$ 7086 pixels. The raw data are monochromatic 8-bit images in the Tagged
Image File Format (TIFF). These images were calibrated and saved with improved
photometric precision as 16-bit images with 2048 $\times$ 2048 pixels in the
Flexible Image Transport System (FITS) format, which contains extensive headers
describing the full-disk images and the observations. The various calibration
steps include, for example, accurate measurements of the solar radius,
determination of the limb-darkening function, and establishing an accurate
coordinate system. The contrast-enhanced and limb-darkening corrected images as
well as the raw data are freely available to researchers and the general public
in publicly accessible repository. The data are published as a special data
release of the Archives of Photographic PLates for Astronomical USE (APPLAUSE)
project.
