These reports document the development of air pontoons and bridges made from India rubber, a material that proved durable and effective in floating heavy loads. The experiments were carried out by the British government in the mid-19th century, and the results were presented in these official reports. They provide a firsthand account of an innovative engineering project that pushed the boundaries of what was possible at the time.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.