The main site, known as H1, was established on the south-east corner of Hermite Island. This was the location of the control room from which the bomb would be detonated, along with the equipment to monitor the firing circuits and telemetry. It was also the location of the generators that provided electric power, and recharged the batteries of portable devices, and ultra-high-speed cameras operating at up to 8,000 frames per second. Other camera equipment was set up on Alpha Island and Northwest Island. Most of the monitoring equipment was positioned on Trimouille Island, closer to the explosion. Here, there were a plethora of blast, pressure and seismographic gauges. There were also some 200 empty petrol tins for measuring the blast, a technique that Penney had employed on Operation Crossroads. There were thermometers and calorimeters for measuring the flash, and samples of paints and fabrics for determining the effect on them. Plants would be studied to measure their uptake of fission products, particularly radioactive iodine and strontium. Stores were unloaded at beachhead H2 on Hermite Island, between Brandy Bay and Buttercup Island, whence the RAAF had built a road to H1. A stores compound was established at Gladstone Beach on Trimouille Island, known as T3.