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This operation was started at 5:00 p.m. and lasted for 29 minutes.

There was a slight lapse condition, a moderate fog, and 100 per cent relative humidity.

A network of sampling stations had been set up on shore.

These were located at the homes of Government employees, in Government Offices, buildings and reservations within the trial area.

A rough attempt was made to characterize the vertical profile of the cloud by taking samples from outside the windows on the first, ninth, and fifteenth floors of a Government office building.