My thanks go to Jon Sass for guiding me with the Project. Nial Adams and Alex Ombler and other staff from the East Riding of Yorkshire Council for their help in supplying and sharing  information and the laser scan survey they carried out for me to record the mills interior as it stands today. Without them and the Mills Archive Trust, where most of Roy Gregory's records are held including his Isometric drawing of the process area along with the photos taken by Jon Sass of the inside of the tower, there would be no record of the site pre 1983.

The drawings are based on the various stages and motive power the mill used to operate. Initially the sails were of the Hoopers Roller Reefing design, where there are a series of canvas blinds that roll up or open as the frame that carries them is slid back and forth along the main part of the sail. These blinds were prone to damage by the weather but were in use until around 1925 when they were removed. From then until about 1936 the mill was powered by diesel and then electricity until about 1983 when the mill was closed and the process areas demolished.

Around 1925 before the sails were removed a Fielding and Platt 50 hp diesel engine was installed.  To house the engine a new structure was added to the Eastern side of the block of buildings. From there it is probable a new line shaft was run across the back of the building and then set to operate the existing wooden drive above the vertical millstones. At that time it is most likely the sails, the cap and the gallery were all removed.  The engine powered the mill for about 10 years and was sold in 1936.

I am indebted to the members of the Fielding and Platt Historical society for their help and drawings and supplying information about a similar 50hp engine. There is a link to their site at the end of section.

Around 1934 the company decided to install a new crushing tub powered by its own electric motor from below. The diesel engine was replaced by an electric motor to continue driving the pumps and operating the wooden crushing tub via the same gearing as the diesel engine used. It seems around this time the longer East West run of buildings was demolished. That part of the building was probably unstable as being predominately timber as all of the sides of the buildings were open louvres that could be adjusted to suit weather conditions. Several photographs taken while the mill still had sails show the 1st floor leaning over and supported by angled props from the ground.

Prior to the demolition of the double storied east west building, according to Roy's isometric there were rapid drying rooms where the floors were heated by the smoke from coal fires. Normal drying was by natural air flow. The dried chalk had the consistency of Meringue. The sides of the buildings were fitted with adjustable louvers that could be altered to suit the  weather conditions. The drawings below show what the area might have been like. Also as the drying area was in this wing  it must have had a stairway and a lift to elevate the collected product up to the first floor. In the early days when the mill was wind powered it was probably a manual operation. The product was dug out with spades from the settling beds in blocks about the size of a loaf of bread.

The replacement building, constructed in 1936 along with the rest of the process areas in the drawings was demolished in 1983 with no record being made other than Roys after production ceased in this part of the plant. At this time the process had been superseded by a more modern semi automatic plant adjacent to it.

The site was derelict until the East Riding of Yorkshire Council took possession and turned a part of the quarry area into a recreational country Park and made access for visitors easier. Now in 2019 the Authority is in receipt of a Heritage Lottery Fund grant and intends to improve both the Park and the mill to create a more attractive and informative tourist attraction. Search on Humber Bridge Country Park or use this link to a   .pdf guide of the park