A Second World War air raid shelter is visible as an earthwork and structure on air photographs, at NZ 3984 5864.
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Two sections of Second World War tank trap are visible as structures on air photographs, at NZ 3627 7210. The two lines of anti-tank cubes are present. No surface features are visible on the latest 1988 Ordnance Survey vertical photography.
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Second World War air raid shelters are visible as structures on air photographs, centred at NZ 3968 5926.
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Second World War air raid shelters are visible as structures on air photographs, at NZ 3916 5883.
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Second World War aircraft obstructions are visible as earthworks and cropamrks on air photographs, at NZ 3475 7483. The feature appears to be no longer extant on the latest 1988 Ordnance Survey vertical photography. The aircraft obstructions predate the anti aircraft battery (UID 1414464) located in the same area.
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Second World War air raid shelters are visible as structures and earthworks on air photographs, at NZ 3911 5853.
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Second World War air raid shelters are visible as structures on air photographs, at NZ 3924 5818.
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A Second World War barrage balloon is visible as a structure on air photographs, at NZ 3950 5801.
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Around 1793 Archibald Cochrane, 9th Earl of Dundonald, had a coal-tar distillery at Bells Close. This was the first alkali factory on the Tyne. The exact location is not known but the tar works were adjacent to an iron works (possibly in order that the coke could be used in smelting), presumably the Tyne Iron Works (HER 4346). It is therefore assumed that the tar works stood east of Tyne Iron Works, on the river bank in front of Holy Saviour Church. At the works the experimental production of soda was undertaken under the name of Losh and Co. (the partners were Dundonald, John Losh and Aubone Surtees, the banker). One of the processes depended on the solubility of sodium and potassium chlorides and sulphates. Salt and waste potassium sulphate from soap works were dissolved in water and evaporated until crystals of sodium sulphate were formed. The remaining potassium chloride was sold to alum makers in Yorkshire. The sodium sulphate was then heated with sawdust and iron oxide to form a small amount of impure soda. However most of the Bells Close soda was made by a different method discovered by Swedish chemist Scheele. Salt and lead oxide were stirred into a paste with water and left for a few days. Caustic soda was formed along with yellow basic chloride of lead (known as Turner's Yellow). The Bells Close factory only worked for four years, but the experiments enabled the partners to produce soda at their Walker factory from 1798 (HER 4197).

A list of chemical works published by the British Association in 1863 lists 'Dr Hutchinson, Felling, early in the present century' and 'Mr. J. Allen, Felling, 1828'. In the heyday of the Heworth Chemical Works there were two separate sites - one at Heworth Shore (the Low Works) and one at the upper end of Brewery Lane (the High Works). In 1828 John Allen had started alkali manufacture at Heworth Shore with Thomas Coultherd. Production was on a small scale. Around 1818 Francis Hutchinson had acquired a site at the top of Brewery Lane where he manufacturered chemicals (epsom salts and alum) but not alkali. In 1830 chambers were erected for the manufacture of sulphuric acid, which was needed for the manufacture of epsom salts and alum. Hutchinson started to make alkali, but he went bankrupt. On 26 July 1836 John Allen and his partners bought the High Works. The two works were now known as Heworth Chemical Works. A plan of the High Works of 1836 shows that it included a filtering and crystallizing house, saltcake and blackash furnaces, two workers houses, a seven-roomed house for the manager, a cooperage, a smith's workshop and a plumber's shop. In 1847 the lease on the works expired and the partnership between Allen and Coultherd was dissolved. Allen moved much of the equipment to his new factory at Wallsend (HER 2088). The Heworth Works were bought by Coultherd for £16,000.