Victorian Oil Lamp with Blue Writhen Glass Stand

During the late 19th and early 20th century houses were lit with candles or oil lamps. The lamps would come in all grades from a cheap utility metal lamp, to elaborate silver or gilt lamp with ornate cut and painted globular shades.
 
This Victorian oil lamp has a blue twisted glass stem and base with a clear glass chimney.  
 
This particular lamp would have been found in a household of moderate means.
 
Dimensions: 50cm high x 12cm base