Monday 21 January 2013

Polish your metal mirror - Sir William Herschel


This is an example of a polishing machine devissed by William Herschel for small speculum metal mirrors. Image: Herschel Museum of Astronomy, Bath 

For your book shelve

From: The Complete Guide to the Herschel Objects: Sir William Herschel's Star Clusters, Nebulae and Galaxies - by Mark Bratton