... Zusammenfassung Kurz vor seiner Abreise nach Südamerika erwarb HUMBOLDT zur Ergänzung instruments. HUMBOLDT used this pocket chronometer for his routine astronomic and geomagnetic observations . HUMBOLDT used this pocket chronometer for his routine astronomic and geomagnetic observations and to fix ”. HUMBOLDT used this pocket chronometer for his routine astronomic and geo- magnetic observations and to fi ..."