<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/9/15" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished letter, 'On an improvement in the eye-tubes of portable achromatic telescopes' from Willm [William] Kitchiner to [Sir Joseph Banks]</dc:title>
  <dc:description>Kitchiner writes of his newest improvement to the eyepiece of an achromatic telescope, calling it a pancratic eye tube. The improvement seeks to achieve the optimum distance between the two lenses in an eyepiece, allowing for the greatest magnification and greatest clarity.

The title of the letter has been added in graphite in another hand.

Subject: Scientific Instruments

Written by Kitchiner in Warren Street, FitzRoy Sqre [Fitzroy Square, London]. Communicated by Sir Joseph Banks. Read to the Royal Society on 20 April 1820.</dc:description>
  <dc:date>21 December 1819</dc:date>
</rdf:Description>