Description

Diverse and universal, this attachment seen on Swift’s No. 1 stands (Paragon,etc.) is a fine example of his early work (produced 1870-1910). One and a half inch diameter substage tube, rotating substage accessory with light filters, wheel of stops, etc. This particular example has a separate polariser and Nicol-type light condenser mounted on opposite ends. Rarely used, it is a marvel of technology and machining. Capable of accommodating objectives, selenite analyzers, etc. Improved and modified over a period of 40 years but essentially the same basic design first seen by the RMS in 1868 when W.H. Hall approached Swift to produce it.