The Amateur's Telescope

This is a scanned version of the 1920 edition of Ellison's The Amateur's Telescope. It contains corrections and amendments in Ellison's own hand presumably in preparation for the 1932 edition.


This 1920 version is being provided on-line free of charge as part of the Observatory's wider educational and charitable objectives, but those who plan to download it (or a significant part of it) for their own use are asked to consider making a small donation to the Armagh Observatory by way of exchange.

 

	Contents
Chapter		page
I.	Introductory - Literature	11
II.	Tools and Materials - Edging - Rough Grinding	13
III.	Testing; Foucault's Shadow Test	22
IV.	Polishing	28
V.	Figuring - Parabolising by Graduating Facets - The Small Polisher System - Parabolising by Overhang - Working Uphill	33
VI.	How to Recognise the Paraboloid - Zonal Testing	40
VII.	Silvering - To Prepare the Mirror for Silvering - To Prepare the Bath - To Polish the Film - A Few Hints - Care of Film	46
VIII.	The Achromatic Object Glass - Calculating Curves, First Principle - Second Principle	55
IX.	Practical. Shaping and Grinding - Polishing	63
X.	Testing and Figuring	68
XI.	Testing and Figuring	71
XII.	The Flat or Diagonal Plane - Cutting out a Plane	74
XIII.	Mounting Lenses and Mirrors	78
XIV.	Reflector Tubes	82
XV.	The Flat Cell and Suspension	88
XVI.	Stands	91
XVII.	The Observatory	96
XVIII.	The Observatory	100
XIX.	The Observatory	104
XX.	Eyepieces	107

Complete book - 130MB PDF file