W. Warrington, London, 1839. Oblong 24mo. 24pp, illustrated with nine leaves of engraved plates, three of which fold out, and one which has an overlay showing workers within the tunnel, illustrations include architectural plans and engineering diagrams for the project, frontispiece showing a completed section of tunnel lit with gas lamps, diagrams also demonstrate exactly how workers were able to remove earth and lay bricks and illustrate the tunnels progress relative to landmarks above ground, inside cover with name and address ’Brunel 18 Duke Street, Westminster’ in Marc isambard Brunels hand writing, also with pencil notes and corrections on page 24, light foxing throughout grey paper wrapper with pink printed label to front which reads THAMES TUNNEL Thames Tunnel, construction on the tunnel began in 1825 and was finally completed in 1843. At the time that this booklet was published in 1839, workmen had completed just 640 of the planned 1,300 feet of the tunnel's length. It’s likely that this booklet was an effort to increase public interest and enthusiasm for the project at its midpoint. More guides such as this were produced as the construction on the tunnel progressed.