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This monograph deals with the technic of photographing absorption spectra and the application of spectrum photography to the study of hemoglobin and derivatives thereof. For the purpose of securing photographs of the entire visible spectrum and at the same time a register whereby the exact location of absorption bands may be determined directly from the picture, the authors employ a specially devised apparatus. The feature of this consists in an appropriate helium bulb, the emission spectrum from which is recorded simultaneously on the same plate with the absorption spectrum under study. In the numerous and remarkably beautiful photographic plates with which this work is illustrated the entire spectrum shows with perfect clearness, while the bright-line helium grating serves for purposes of orientation. The authors claim for this method a superiority over any in which results must be subjectively recorded. With their technic the authors negative the view that formic acid
Beiträge zur Photographie der Blutspektra, unter Berücksichtigung der Toxikologie der Ameisensäure.. JAMA. 1910;55(6):523. doi:10.1001/jama.1910.04330060075036