On December 18, 1947, the largest 3600-rpm tandem-compound steam-turbine generator ever built up to that-time was placed in service at the Essex Generating Station of the Public Service Electric and Gas Company, Newark, N. J. Since it was the first of a new class of turbine for both the manufacturer and the operating company, and since the throttle steam temperature was 1000 F, extensive tests were made to determine practical operation procedures for the new machine. These tests indicate that, even with the high steam conditions of 1250 psig this 1000 F turbine generator can safely withstand starting and loading rates higher than those normally used. The operating instructions for this machine can be revised to take advantage of these characteristics. Additional data are needed for wider application to other machines and designs.