A fine, signed pocket drawing/draftsman’s set of brass and steel instruments with ivory ruler by John Bleuler, 27 Ludgate Street, London c.1800. Although having the later knurled screws for the instruments ( rather than the 18th century butterfly nut version), this set is all original and matching and is in rarely used condition. Pens, pencils, dotting pen, small dividers, large compass with interchangeable tine, perfect ivory ruler. Flawless sharkskin case with trade and and marbled paper applied to the inner lid. Secure clasp and hinge. Not the largest set available at the time but a superb example by an excellent maker of scientific and mathematical instruments. 6 3/4 x 2 3/4 x 3/4″ thick. ( 17 x 7 x 2 cm).
John Bleuler, spectacle and scientific/mathematical instrument maker apprenticed to Henry Shuttleworth ( and married his daughter). In 1780 he established a business at 27 Ludgate Street, London and remained there for 40 years. In his first year of business he designed the “in between lens” (substage condenser) used by all instrument makers of the Jones most improved microscope. It was designed on a swinging arm to enter the optical axis when light was need to be concentrated between the mirror and the stage and/or objective lens.
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Mark Hacking (Scientifica Opticae Inc.) has been an avid collector/dealer for over 30 years. A former Science teacher, he has an innate love for anything natural or mechanical. Specializing in optical (microscopes, telescopes), surveying, medical, weighing and drawing instruments, he is an active participant of the Scientific Instrument Fair in London. Living in Stratford, Ontario, Canada, with his wife and two children; Mark looks forward to meeting as many fellow collectors as possible, and has a worldwide following on eBay (Sciopti).
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