The Digges telescope...

The story of how an Englishman apparently invented the telescope in the mid-sixteenth century is not as well-known as perhaps it ought to be. Its outline was first proposed in 1991 by Colin Ronan, the then president of the British Astronomical Association (and so a credible source): a very readable set of articles (though sadly without matching illustrations) is here, from which I quote below.

Essentially, it boils down to this: that an English Renaissance surveyor and author called Leonard Digges (ca. 1520 - ca. 1559) constructed what was called at the time "perspective glasses" (the term 'telescope' did not appear until the 17th century), quite probably for surveying purposes. However, it seems likely that his son Thomas Digges pointed them to the heavens, several decades prior to Galileo.

From a Voynichological perspective, one of the nice features of the story is that one of our old friends features centrally: when Leonard Digges died, his 13-year old son Thomas was placed under the guardianship of none other than John Dee. Dee, in his preface to Billingsley's 1570 translation of Euclid had this to say:

• 'He may wonderfully helpe him selfe, by Perspective glasses. In which (I trust) our posterity will prove more skillfull and expert, and to greater purposes, than in these days, can (almost) be credited to be possible.'

This, when taken with Thomas Digges' own books and a 1583 report by William Bourne ("an expert in navigation and gunnery"), does all seem to comprise a 'smoking gun' proof that the two Digges in many significant ways predated Galileo by several decades. Which is not, of course, to diminish Galileo's historical importance per se: but rather, to show that the history of inventions is rarely as simple and linear as one might think.

One last thing: in the Netherlands patent uproar over the first 'official' telescopes, "the son of Sacharias Jansen [a better Wikipedia page is here], another of the claimants, later stated that his father [Hans Jannsen, the probable inventor of the microscope in 1590] already had a telescope of Italian manufacture, dated 1590". So the full story behind the invention of the telescope most likely remains obscure and tangled...

New telescope history book...

To mark the four hundredth anniversary next year of Galileo's first astronomical use of the telescope in 1609, the IAU has designated 2009 "The International Year of Astronomy" (IYA2009): which is likely to be the trigger for a glut of telescope history-themed books (probably no bad thing, in my opinion). But what happened before 1609?

I recently mentioned here "the lost 150 years", that awkward pause between the widespread availability of both convex and concave lenses (circa 1450) and the appearance of microscopes (circa 1590) and telescopes (circa 1600). Such compound optical devices could have been invented by anyone during that period, and the best-documented pre-1600 telescopic claim so far seems to be from Thomas Digges (John Gribbin discusses this in one of his books). But could yet other inventors (such as possibly the author of the Voynich Manuscript) have pre-dated Digges, Janssen and co?

There were plenty of alchemical-style claims to that effect, most notably from H. C. Agrippa, who wrote in his "Occult Philosophy" that "And I knew how to make by them wonderful things, in which any one might see whatsoever he pleased at a long distance" (Book II, Chapter 23) . However, there was (in this case) apparently nothing of real substance behind his bluster.

All the same, I asked on the HASTRO-L mailing list if there were any up-to-the-minute books on this far-too-quiet period, and was delighted to learn (via Peter Abrahams) of a book that is just coming out from Harvard University Press: "Galileo's Glassworks, The Telescope and the Mirror" (2008), by Eileen Reeves, Associate Professor of Comparative Literature at Princeton, who specialises in the study of early modern scientific literature. Though the publisher's blurb seems to make her book sound over-focused on the minutiae of Galileo's rhetoric, I'm assured that its first half does actually take in the wider pre-1609 field of view (which is precisely what I was most interested in).

The release date for Glassworks is either January 2008 or 28th February 2008 (depending on who you ask): there are already some copies for sale in the US, but it's only pre-ordering in the UK at the moment. I'll review it here when my copy arrives (counting the days)...