Making separation trenches on a broad platform with heavy, double picks (the German Schrotpickel) in the large Ostermundigen sandstone quarry near Berne (Switzerland) in 1951. Photo by W. NYDEGGER as reproduced in SCHMALZ (1983, 30) along with several other very illustrative images of traditional extraction techniques that were in full use in the modern era at Ostermundigen well after more modern quarrying techniques became available.