Suffocating Smoke

"Tunstall, Burslem, Hanley, Stoke, Fenton, Longton, through the smoke"




"This occasioned such immense and constant volumes of smoke, as literally to envelope the whole neighbourhood: and it was not infrequent for passengers to mistake their way, and run against each other, during the continuance of this process. The scene which presented itself upon these occasions, has been not inaptly compared to the emissions from Etna and Vesuvius..." from: A Topographical History of Staffordshire: Including Its Agriculture, Mines ...  By William Pitt  1817




"Figure to yourself a tract of country, the surface of which, cut, scarred, burnt and ploughed up in every direction, displays a heterogeneous mass of hovels and palaces, farmhouses and factories, chapels and churches, canals and coal pits, corn fields and brick-fields, gardens and furnaces, jumbled together in 'the most admirable disorder' and you will have a pretty correct idea of the Staffordshire Potteries. Pervade the space your fancy has thus pictured, with suffocating smoke,  vomited forth incessantly from innumerable fires, and the thing will be complete."  from Monthly Magazine, 1st November 1823


Longton The Last Bottle Oven Firing in the Potteries Date: August 1978
Longton  -  The Last Bottle Oven Firing in the Potteries
Photo: Terry Woolliscroft Collection  Date: August 1978

There were no tall chimneys, no factory buildings frowning above the streets; but only a fantastic collection of narrow-necked jars or bottles peeping above the house tops on every side, looking as if giant biblical characters after a search for oil or wine, had popped them there, among the dwarf streets. These, of course, are the pottery kilns and ovens ... Without these great bottle of heat, there would be no Potteries. They represent a very heart and soul of the district, as you very soon learn; and unless you are prepared to take a deep and lasting interest in what happens inside those ovens, it would be better for you to take the first train anywhere."   from English Journey by J.B.Priestley, 1934, page 199


THE ORIGIN OF SMOKE IN BAITING

Extract from:  Excess Air in the Firing of Ovens and Kilns by J W Mellor, 1907
Based on a paper:  Transactions of the English Ceramic Society, 6, 58, 1907

“For the complete combustion of any fuel there must be an adequate supply of air intimately mixed with the combustible gases coming from the firemouths. The minimum volume of air required for the complete combustion of 1 lb. of carbon is nearly 143 cubic feet. This is the theoretical quantity deduced from the simple equation :  C + O2 = CO2

But practically, owing to the fact that air and gas currents can pass along in streams side by side from firemouth to hovel without mixing to any great extent, very much more than the theoretical amount of air is required before we have an adequate supply for complete combustion.”

“I did not expect to find the greatest excess of air passing through the ovens and kilns immediately after a baiting when the fire-mouths were smoking, and least when the fire was burning clearly without smoke.

A probable explanation is that the burning hydrocarbon gases which are given off when coal is first put on the fire are decomposed by the inrush of cold air with the formation of smoke or soot, when the fireman opens everything immediately after a baiting in order to " clear the oven," and simultaneously the temperature is reduced below the "burning temperature" of the smoke.

The admission of cold air into a hot furnace burning hydrocarbon gases makes smoke instead of clearing it. But there are other reasons why air is allowed to rush through the oven immediately after a baiting.

The mechanism of the reactions which occur when the hot hydrocarbon gases, methane, ethylene and acetylene are brought in contact with cold air is, no doubt, a mechanism which is very complex. In any case the liberated carbon ultimately aggregates into particles of soot and smoke.

When smoke is once formed it can only be burned with very great difficulty.”





SUMMARY of the full article
  1. In the firing of an ordinary kiln, with flues leading direct from firemouth to hovel, the flue gas has about 55 per cent, of air in excess of that theoretically required for the complete combustion of coal.
  2. The products of combustion enter the hovel at about 800° and therefore 4 cwts. of coal per ton are used in warming up the excess air passing through an ordinary kiln.
  3. The excess of air may be reduced about 85 per cent, by causing the flue gases to pass by a circuitous path from firemouth to hovel.
  4. There is over 50 per cent, excess air in the flue gas of an ordinary up-draught oven. This excess is reduced some 20 per cent, in firing down-draught.
  5. The practice of allowing an inrush of cold air immediately after a firemouth has been charged is mainly responsible for the formation of smoke and soot by the decomposition of the hot hydrocarbon gases.  Note: Do not confuse soot with coal and ash dust.





'SMOKE CONSUMPTION IN THE POTTERIES'

From:  The Civil Engineer and Architects Journal
Mention of The Sanitary Act 1866
Here is an interesting piece about the smoky conditions of The Potteries.  Digitised on Google Books  click here>


Longton -  The Last Bottle Oven Firing in the Potteries
Photo: unknown source   Date: August 1978


http://bottleoven.blogspot.co.uk/
Burslem
Alcock Lindley and Bloore on the corner of Overhouse Street and Scotia Road
Photo: source unknown    Date: unknown

Burslem
Maddock's smoking ovens. The tower with the Maddock sign is a dipping house drying mangle.
A similar construction still exists (in 2016) at The Middleport Pottery
Photo: Source unknown  Date: Unknown 


Burslem
T and R Boote tile manufactures, Waterloo Road
Photo: Source unknown  Date: unknown


Middleport, Burslem
Middleport Pottery  - Oven smoking
Photo: source unknown   Date: unknown

Middleport, Burslem Middleport Pottery - baiting
Middleport, Burslem
Middleport Pottery - baiting
Photo: source unknown  Date: unknown


Bottle ovens being fired and creating smoke in The Potteries
Smoking bottle ovens in The Potteries
photo: taken at Earnshaw's potbank, Stoke-on-Trent
From the Gladstone Pottery Museum Photographic Collection. 
Photo: courtesy Staffordshire Past Track here>   Date: 1950/51

J & G Meakin Eastwood works from Lichfield Street, Hanley
Hanley
J & G Meakin Eastwood works from Lichfield Street
Photo: source unknown  Date: 1951

Cliffe Vale, Hanley
Twyfords Sanitaryware Factory
Photo: courtesy EJD Warrillow Collection  Date: 1951


Longton
Salisbury Crown China Works, on the corner of Edensor Road and Stafford Street (The Strand)
Photo: Source: Phil Rowley 

Longton skyline
Photo: source unknown  Date: unknown

Longton
Photo: Source unknown  Date: Unknown


Longton The Last Bottle Oven Firing in the Potteries
Longton
 The Last Bottle Oven Firing in the Potteries
Date: August 1978


Possibly Longton
Photo: source unknown  Date: unknown


Longton
Photo: Postcard source unknown  Date: unknown