Postcards are a good source of material showing 
							mills and many of the mills featured on them no 
							longer exist.  This is a brief introduction to this 
							fascinating hobby.
							
							
							For those studying mill details, by far the best 
							reproduction method for postcards are real 
							photographs.  Such cards (depending on quality) 
							allow the use of a ‘magnifying glass’ to search for 
							small details of the mill construction and so on.
							
							
							
							Lithographic or chromo-lithographic (coloured) 
							postcards are almost up to the standards of the real 
							photograph card in terms of being able to study 
							detail.  However, in some instances the image was 
							based on watercolour paintings.   These may have had 
							some artistic licence applied and may not be so 
							useful to study mill detail.  They are however 
							highly collectable and in their own right a work of 
							art.
							
							
							The UK was slower than its continental neighbours to 
							use picture postcards for transmission of messages 
							through the post.  It was in 1894 that British 
							publishers were given permission by the Post Office 
							to manufacture and distribute picture postcards, 
							which could be sent through the post.  From 1899 
							onwards the standard size of 5.5in by 3.5in (approx 
							140mm x 90mm), already in use in other countries, 
							was adopted in the UK and became the standard 
							format.  The postal rate within the UK for postcards 
							was ½d until 1918.  In the UK, Ralph Tuck & Sons 
							Ltd, London were one of the earliest postcard 
							publishers.  Their first postcard was published in 
							1894 and they became the leading postcard publisher, 
							particularly in the art rather than photographic 
							reproduction field. 
							
							
							Lithography 
							is a form of plano-graphic printing, meaning that 
							the surface is flat.  It is based on the chemical 
							repellence of oil and water.  Simply, designs were 
							drawn or painted with greasy ink or crayons on 
							specially prepared limestone.  The design may have 
							been copied from an actual watercolour or oil 
							painting which would be in front of the 
							lithographer.  The stone is moistened with water, 
							which the stone accepts in areas not covered by the 
							crayon.  Oily ink, applied with a roller adheres 
							only to the drawing and is repelled by the wet parts 
							of the stone.  The print is then made by pressing 
							paper against the inked drawing.