In 1900 the first Zeppelin made its maiden flight, observed by Alexander. The Zeppelin was launched from a floating assembly hall on Lake Constance; Patrick observed from a motor boat in order to be as close as possible. Later that year, at the invitation of the Berlin Metrological Institute, he made a flight in the world's largest balloon, a non-dirigible with a capacity of . The objective was to make metrological measurements and break the existing endurance records. It is indicative of the esteem in which Patrick was held that he, a non-German, was offered a place. The balloon was equipped against every eventuality and stocked with rations for 20 days. The balloon took off on 27 September, just before 6 pm. The same evening, their trailing rope became stuck in trees and gusty winds caused the crew to lose control. In the dark it was decided to release the gas and land the balloon. The ambitious expedition ended just from the start.