... Scans of a loose leaf folder from John Butler - June 2011 Folder also contains 2 copies of "Armagh's Longcase Regulators" by Alastair G Gunn Not scanned because already available at http://www.arm.ac.uk/history/clocks.pdf . Betts.pdf - "A REPORT ON THE PRECISION CLOCKS AT ARMAGH OBSERVATORY" Jonathan Betts, Old Royal Observatory, October 1989 Includes: 2 pages handwritten notes by John Butler, 2 pages email exchange Butler and Betts . ... Betts.pdf . 2011-06-24 14:04 . ... PDF file . ...