to increase to a point where their overspeed devices opened. This stopped engine No, l. 3, With the fuel supply shutoff, engine No, 3 continued to run, probably because of heated lubrication oils being forced into the cylinders and fired upon compression, When the crank case was cooled by the outside air the engine stopped, The ground shock which caused the oil circuit breakers to open was quite severe and apparently no one was prepared for a shock of this magnitude, Holmes & Narver had not beer advised that a heavy ground shock would follow the blast and this accounts for no preparation being made to energize the fuel shut off valves on the engines when the main source of power was gone. As a result of the experience gained from the Ranit experiment, the wiring of the solenoid operated fuel oil shut off valves was modified to provide battery energization for these valves in the power plants at Engebi and Aomon in the event circuit breakers in these plants also opened, From minus 0210 hour on Easy Day on Engebi, the power output increased from 130 to 170 kw, the voltage increased from 120 to 124 volts, and the current increased from 43 to 53 amps at 2,400 volts. Frequency remained the same, This increase in voltage during the five hours prior to zero was evidently due to the heating in the power plant effecting the temperature element on the voltage regulator, The second of two short circuits at zero plus 14,72 seconds shut down the power plant before the timing circuit functioned, For the George Experiment on the Aomon Group, battery energization of the fuel oil valve was again provided. Following is a summary of the power plant operational data on George Day: Current (amps at2400volts) Frequency incycles Time Kw Voltage Minus 60 minutes 138 120 40.5 60 Minus 30 minutes 170 120 50.0 60 Minus 15 minutes 200 118 64.0 60 Zero plus .83 seconds 220 120 64,0 60 Fluctuations in load at minus 15 and minus 30 minutes resulted in transient variations in voltage and frequency. Two engines shut down on short circuit at plus .83 seconds, The third continued to run until shut down manually the following morning at approximately eight-thirty. The item experiment at Engebi required operation of two engines in the power plant, and the plant was prepared for zero hour in accordance with established procedure, Examination of the charts after this test indicated that the voitage was continuous and uninterrupted from the