Prof. M. Kloss of Berlin tested Hans Coler's Stromzeuger on 3 March 1926, with Prof. Dr. R. Franke of the Technical College of Berlin present. His report, dated 4 March 1926, is Appendix II of BIOS Final Report No. 1043.
The 1926 test
Kloss described the apparatus as having double-row copper plates, double-row flat spools, and an electromagnet system with silver wires on cores, powered by three 6 V / 6.5 Ah accumulator batteries. His measurement table is reproduced in kloss-stromzeuger-test-1926.
With three bulbs, Kloss recorded plate plus spool battery current of 0.215 + 0.070 = 0.285 A, while the bulbs consumed about 3.5 A at about 2.3 V. On that basis he computed roughly 1.7 W in against roughly 8 W out — a ratio of about 12×.
Assessment in the source
Kloss could not explain the energy source; he conjectured that the magnet system was the source, and recommended building a larger apparatus with built-in instruments. He also asked whether the magnets wear out; the dossier does not record an answer. His measurements are the highest apparent multiplication ratio in the dossier, and they were not confirmed by the BIOS team's own 1946 experiments.
Source notes & attribution
- https://rexresearch.com/coler/colerb.htm