The burner appears to work fine and the winders work. I have not lit the lamp but see no reason why it wouldn't work. At it's tallest extent I wouldn't chance it to hold upright unless attached directly to a desk or similar (as they would have been originally), but it holds the font at full capacity, see photo 2 but wouldn't stay put if it was knocked etc. The lamp leans very slightly outwards, see photos.It stands 73cms high overall and 54cms high to the top of the burner. The approximate width is 60cms.
Please check photos carefully and ask any questions. The item "Antique rise & fall desk OIL LAMP student brass glass blue shade Wright & Butler" is in sale since Monday, November 26, 2018. This item is in the category "Antiques\Antique Furniture\Lamps\Victorian (1837-1901)".
The seller is "sarahsemporium" and is located in Llandysul, Ceredigion. This item can be shipped to United Kingdom, Antigua and barbuda, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei darussalam, Cayman islands, Dominica, Ecuador, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French guiana, Iceland, Jersey, Jordan, Cambodia, Saint kitts and nevis, Saint lucia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Peru, Paraguay, Reunion, Turks and caicos islands, Aruba.