Victorian Black Glass Artificial Horizon Set by John Lilley & Son London Antique Razor Set and describes the method of

and describes the method of construction

discussing the various efforts to expand the scale

The standard double Vernier version was retailed at £6

the firm ceased the public retailing of scientific instruments sometime around the late 1960’s and continued with a focus on the aviation industry in numerous guises until its eventual liquidation in the year 2000

5 inch telescope with attached glass level below

Victorian Black Glass Artificial Horizon Set by John Lilley & Son London Antique Razor Set and describes the method ofFor sale, an exquisite maritime black glass artificial horizon set by John Lilley & Son, London The base of the instrument takes the form of a brass rectangular tray which is inset with a mirror finished black glass plate with bevelled edge. The plate three pointed feet which are clamped to each side and screw threaded in order that they can be adjusted to a level position. The plate is accompanied by a large brass spirit level with a flattened base