Dr. Pescher’s Spiroscope was primarily a device for exercising the lungs by moving water from the upper chamber to the lower. In this case, the amount of water that could be moved was used to diagnose the extent of a disease, most likely anemia from malaria. From Bulletins de la Société de pathologie exotique et de ses filiales de l’Ouest africain et de Madagascar, 1930, tome 23, page 138.