Unpublished letter, 'Boring register, Bow Island, South Pacific' from Edward Belcher to the Royal Society Belcher shares the results of the boring operations carried out on the island, as well as the register of the daily proceedings, under the supervision of Mr. Thomas Pass, acting master of H M S Sulphur. The depth reached was 45 feet, when the augur broke, and no further progress could be made. Annotations in pencil throughout. Subject: Hydraulic engineering Written by Belcher on H M S Sulphur at Spithead. Whilst the Royal Society declined to publish this paper in full, an abstract of the paper was published in volume 4 of Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society] as 'Boring register, Bow Island, South Pacific'. 26 July 1842