Thomas Jones

The Englefield mountain barometer was designed to calculate altitude and was so easy to use that a reading could be taken out of the window of a carriage – provided the horses stood still. Using a bar of mercury, which fell in the lower air pressure of higher altitudes, the barometer gave readings accurate to one thousandth of an inch. By taking a mercury reading at two locations, the owner could work out the difference in altitude between them. In this companion book, first published in 1817, the maker of the new barometer, Thomas Jones, provides tables listing the heights of objects measuring between fifteen and thirty-one inches of mercury. These measurements account for the heights of all mountains in England. He also includes tables that show how to allow for the expansion of both air and mercury. A fascinating book for historical researchers and experimenters in physics alike.

Title: An historical and geographical memoir of the North-American continent; its nations and tribes: by the Rev. J. B. G. With a summary account of his life, etc. by T. Jones.]Publisher: British Library, Historical Print EditionsThe British Library is the national library of the United Kingdom. It is one of the world's largest research libraries holding over 150 million items in all known languages and formats: books, journals, newspapers, sound recordings, patents, maps, stamps, prints and much more. Its collections include around 14 million books, along with substantial additional collections of manuscripts and historical items dating back as far as 300 BC. The HISTORY OF COLONIAL NORTH AMERICA collection includes books from the British Library digitised by Microsoft. This collection refers to the European settlements in North America through independence, with emphasis on the history of the thirteen colonies of Britain. Attention is paid to the histories of Jamestown and the early colonial interactions with Native Americans. The contextual framework of this collection highlights 16th century English, Scottish, French, Spanish, and Dutch expansion. ++++The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to insure edition identification: ++++ British Library Gordon, James Bentley; Jones, Thomas; 1820. 4 . 10408.f.12.