T. H. P. Dennis and Co
of Chelmsford, manufacturers of horticultural buildings and related heating plant.
1862 Exhibited at the 1862 London Exhibition. Details of their products (Patent metallic horticultural building, or glazed structure) shown [1]
1875 Rookes Evelyn Bell Crompton went into partnership with Thomas Hungate Preston Dennis.
1876 Description and illustration (see above) of an interesting type of high pressure valve. 'As the discs are pushed down and brought opposite to the openings they cover, are at the same time made to rotate, and are thus forced apart and closed up against their seats by the action of the screw at the back of each valve....'[2]
Imported generators and arc lamps from the Belgian electrical inventor Gramme, to light some ironworks in Derbyshire that were owned by some of Crompton's relatives. Crompton soon began to make his own arc lamps that improved on Gramme's designs and to develop a new type of dynamo.
1878 Partnership change. '...the Partnership heretofore subsisting between the undersigned, Thomas Hungate Preston Dennis, Charles Portway, Rookes Evelyn Bell Crompton, and Frank Attfield Fawkes, in the business of Horticultural Builders and Manufacturers of Valves, Boilers, and Hot Water Heating Apparatus, under the style or firm of T. H. P. Dennis and Co., carried on by them at the Anchor Iron Works, Chelmsford, in the county of Essex, and at Mansion House-buildings, in the city of London, has been dissolved, by mutual consent, so for only as regards the said Charles Portway...'[3]
1879 Description of hydraulic stop valves. [4]
1884 Partnership change. '...the Partnership heretofore subsisting between the undersigned, Thomas Hungate Preston Dennis, Rookes Evelyn Bell Crompton, and Frank Attfield Fawkes, in the business of a Horticultural Builder, and Manufacturer of Valves, Boilers, and Hotwater Heating Apparatus, under the style or firm of T. H. P. Dennis and Co., carried on by them at the Anchor Ironworks, Chelmsford, in the county of Essex, and at Mansion House-buildings, in the city of London, has been dissolved, by mutual consent, so far only as regards the said Thomas Hungate Preston Dennis...'[5]
Became Crompton and Fawkes