# This volume contains the instruction booklet produced to accompany the instrument. It contains text in both English and French, and a very nice plate. The following background information is an extract from the comprehensive Catalogue of the Microscope Collection at the Science Museum, London by Brian Bracegirdle - also published by Little Imp Publications. It refers to an instrument in the collection - Inventory No. 1938-700. Origin: English. Signed: Microscopium Catoptricum/RB.MD.RSS.Invt. Jos. Jackson Londini fecit./ Instrument: Diameter of body 80; length of body 363. This most interesting and important instrument was described by Robert Barker MD FRS (1736) - A catoptric microscope, Philosophical Transactions number 442. The design was the first reflecting microscope ever constructed. It was simply a small Gregorian telescope, focussed by altering the separation of the two mirrors. The eyepiece is a typical telescope eyepiece fitted with a pinhole eyecap mounted in a plane conjugate with that of the small mirror. Barker said that the instrument was made for him by Mr Scarlett junior, and would focus on objects between nine and 24 inches in front of it. He was concerned to have a good working distance for viewing parts of larger objects; he makes no mention of overcoming chromatic aberration. So it does to this day, with some difficulty, but image quality is terrible! The spherical aberrations are cumulative, and the results are more those of a toy than a serious instrument. Information regarding Joseph Jackson is quite scarce and not all references fit into a logical pattern. However, the detail as follows may provide sufficient information for further research. One Joseph Jachson was licensed by John Hadley to make his quadrant in 1734. This could be the Joseph Jackson that was apprenticed to Thomas Heath of the Grocers' Company on Oct. 10, 1723, free of the Company on May 13, 1735. In 1738 a Joseph Jackson was apprenticed to Thomas Yorke of Angel Court, Strand, London. Other addresses include: Opposite Exeter Change, Strand (1735); Angel Court in the Strand (1736); near Surrey Street in the Strand (1739); Angel Court in the Strand (1760); all London. Also included is a text version of the English section of the booklet. You may simply peruse the publication via the browser. However, scans of considerable size have been included on the CD and may be printed using any image handling software that can cope with JPG files (this is practically all). The pages should be located on the CD using your system File explorer. Those that you should be looking for are as follows:- page1.jpg - English Page 1 page2.jpg - English Page 2 page3.jpg - English Page 3 page4.jpg - English Page 4 fpage1.jpg - French Page 1 fpage2.jpg - French Page 2 fpage3.jpg - French Page 3 fpage4.jpg - French Page 4 plate.jpg - Plate To begin browsing click the Next button below.