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For much more information, see John George Bodmer: Obituary.
John George Bodmer (1786-1864) was the Anglicised name of Johann Georg Bodmer.
J. G. Bodmer of Britannia Foundry, 22 York Street, Chorlton-on-Medlock, Manchester
1786 Born in Zurich, Switzerland.
1799 Millwright apprentice at the age of 13/14.
1806 Producing interchangeable parts for rifles.
1809-13 Invented the detachable bayonet for breech-loading rifles, but this idea was not taken up for many years.
1821 Left the service of the Grand Duke of Baden. He also relinquished his partnership in the cotton mill and returned to Switzerland.
c1821 Birth of son Louis Rudolph Bodmer in Zurich
1828 He returned to this country to push the sale of his inventions. He lived for a time at Manchester, and then at Bolton, where in partnership with a man named Novelli he set up a cotton mill in which his improved machines were installed. However, towards the end of the year his health failed and he had to return to Switzerland.
1833 Returned to England in the Summer. He appointed Sharp, Roberts and Co sole makers of his improved cotton machinery.
1837-8 concentrated on work for the cotton spinning industry with machine tools and foundry work
1838 Patent extension. 'JOHN GEORGE BODMER, formerly of No. 50, Oxford-street, Chorlton-row, in the parish of Manchester, in the county of Lancaster, Civil Engineer, but now of Mayfield-terrace, in Chorlton-row aforesaid (now called Chorlton-upon-Medlock), Civil Engineer, hereby, gives notice, that he intends, forthwith to apply to Her Majesty in Council for a prolongation for the further term of seven years, or such other term, not exceeding seven years, as Her Majesty shall please, of the term of sole using and vending his the said John George Bodmer's invention of 'certain improvements' in the machinery for cleaning, carding, drawing, roving, and spinning of cotton and-wool,"...'
1839 Patented a vertical lathe (Patent No. 8070), which he called a Circular Planer' 
1841 Listed as 'John George Bodmer, Britannia Foundry, 22 York Street, Chorlton-on-Medlock' 
1842 Advertisement. Bodmer and Co, Britannia Foundry, 22 York Street, Chorlton.
1842 Another locomotive built
1845 The Manchester premises closed
1848 Bodmer left England for Vienna
1852 Details of Slotting machine (J. G. Bodmer of London) and Radial drill (J. G. Bodmer of Manchester)
1852 Bodmer's improved stopcock
1860 Returned to Zurich.
1864 May 30th. Died in Zurich age 78. 'for many years established in Manchester'.
1846 Sale of Manchester Works and Equipment 
1846 Advertisement: 'Valuable Lathes, Planing Machines, &c.
By T. M. FISHER, THIS PRESENT WEDNESDAY, and two following days, the 20th, and August, at the Machine Shop belonging to Messrs. Bodmer and Co., situate in York-street, Chorlton-upon-Medlock, Manchester, (in consequence of the premises being required by the South Junction Railway Company,) sale to commence each day punctually at eleven o'clock in the forenoon :
THE Capital MACHINERY, which is mostly new, on the best modern principle, and in excellent condition, and comprises two 7 inch, two 7½ inch, and one 7 inch raised to 9½ inch double geared slide lathes, each with planed bed, compound and common rests, regulating screw and driving apparatus ; five pairs of 7 inch, and one pair of 12 inch headstocks for lathes, all double geared, and arranged for being connected with the regulating screw of slide lathes ; three 8 inch double geared surfacing slide lathes, on four cast iron planed beds, each 8 feet long, with breaks to take in 4ft. 7in. diameter, with three 34 inch face plates, and three self-acting surfacing slides; pillar lathe; 7 inch raised to 9½ inch single speed lathe; five pairs of 8-inch double-geared headstocks for lathes, each with two face plates and bell chucks; nineteen regulating screws for lathes, from 4ft. to 21ft. 6in. long, and 3/8 and ½-inch pitch; compound and other slide rests, for 8 to 12-inch lathes; thirty-four patent self-acting screw chucks, for 4 to 12-inch lathes; power planing machine, self-acting in the angular and horizontal cuts, will plane 7ft-10in. long, 3ft. 4in. wide, and take in 3ft. 4in. deep; two power planing machines, self-acting in the angular and horizontal cuts, with angle tables, each will plane 16ft. long, 2ft. 7in. wide, and take in 1ft. 9in. deep; upright drilling machine, with fixings for an 8-inch pillar ; circular self-acting planing and boring machine, will take in 8ft. 3in. diameter, 3ft. deep; eight self-acting horizontal boring machines, each with planed table, boring bar and head; large shaping and nut cutting machine, with compound slide rest and 16-inch cutter; grooving or stand cutting machine, with sliding table and three cutters; self-acting nut cutting machine, with sliding pinion, cutters, and arbors; two patent grinding or equalizing machines, with rack, pinion, and grinding disc; upright boring machine for large cylinders, pillar 11ft. high 9 -7/16 in. diameter; capital self-acting radial drilling and boring machine, will take in 4ft. 6in. high; powerful crane, jib 13ft. 4in. long, capable of raising 15 tons; excellent foundry crane, jib 21ft. 6in. long, both with strong chains, hooks, and blocks; first-rate hoist, with traversing apparatus, railway, and carriage, crab, crane, and fixings, with 100 feet of ½-inch chain; weighing machine, Fairbanks patent, up to 6½ tons; vices, benches; several pairs of stocks, with taps and dies; surfacing plates, maundrills, catches, drills, rosebits, boring rods, bits, rimers, steel cutters, chasing tools, turning tools, for iron and wood; circular saw, with cast iron planed table; grindstones, cupboards, fitters’ and joiners’ benches, driving straps, bar, rod, and scrap iron, steel, twelve smiths’ hearths, with anvils; tongs, swages, hammers, and bolt tools; six smithy cranes, and a powerful fire engine, with branches and hose. To be viewed on Monday and Tuesday, the 17th and 18th August, when catalogues may be had on the premises, or before, by applying to the Auctioneer, 21, Princess-street, Manchester.'
1849 Sale of Equipment 
1849 Advertisement: 'To Coal Proprietors. Engineers, Millwrights, Machine Makers, Rope Manufacturers, and others.—
'Sale of Six Steam Engines, on a new and improved plan ; Large Cutting Machine, Drilling do. Surface Polishing do.; Two Pentographs, One Drawing Frame, for hemp ; and Four Spinning Frames, for do.; Lathes &c. By JAMES DREW (by order of the late firm of Messrs. J. G. Bodmer and Co. machinists), on Wednesday and Thursday, the 2lst and 22d days of November, 1849, at the warehouse opposite the Atlas Works, Great Bridgewater-street, Manchester.
'THE Valuable MACHINERY, comprising one condensing steam engine, equal to 100 horses' power —his engine was made for a coal pit, and the piston rods are coupled to the pump rods; one steam engine, equal to 30 horses' power, for high-pressure or condensing, not quite finished - one do. equal to 30 horses' power, not finished ; two high-pressure steam engines, equal to 10 horses' power each, with propellers on a new plan, for steam navigation, with high pressure steam boiler on the locomotive principle; one steam engine equal to 8 horse's power, fitted up for high-pressure or condensing; parts of a 60-horse steam engine, one large excellent cutting machine, for cutting wood spur and bevil wheel patterns to 28 feet diameter— specimens of wheels cut by the above machine may be seen by applying on the premises ; one very superior machine for drilling throstle and mule spindle rails, with regulating screw and dividing index, will bore three holes at once ; - machine for grinding and polishing slide lathe beds, surface plates, &c. from 1 foot to 12 feet long; two pentographs, for making wheel cutters for 1 to 12 inches diameter; one drawing frame, for preparing hemp; four machines, of four spindles each, for spinning hemp—these are the best machines that have ever been made for the above purpose, the screws that work the gills are 4½ feet long by three inches diameter, one on the same principle is now working at the dockyards, Plymouth, and is much approved , of; two apparatuses for boring nuts of regulating screws, for 5 and 12 inch slide lathes ; machine for boring and turning parallel or cone spindles, for hemp machines ; two sets of rollers, for making spherical springs for railway carriages ; spherical apparatus, for turning governor balls, valve balls, and seat or circular steps ; do. for boring and turning circular steps; machine for drawing and flattening wire, for reed makers; machine or rest for shaping keys, for staking on wheels, pulleys, &c. drawing frame for cotton, and three lap machines; self-acting slide lathe, eight feet on the bed, for turning and boring carding engine cylinders ; maundrill, for turning cast-iron doffing cylinders for carding engines ; one very excellent eight-inch turning lathe, with face plate, bell chuck, and cone speeds; a number of hollow and round steel and case-hardened guages or templates, from ½in. to 4in.; about fifty yards of new bright wrought-iron shafting, from 2in. to 3in diameter, with couplings, keys, hangers, brass steps, and turned cast-iron pulleys; one 12-inch slide rest; cast-iron division wheel, 3 1/3 feet diameter; large casting for slotting machine; cast-steel screw taps and cutters, various sizes; screw nuts, finished and unfinished ; new forged work for turning lathes; a complete set of wood patterns of 100 horse steam engine ; one complete set of grid patterns for a 60-horse steam boiler; ditto for 20-horse; ditto for 8 horse; one complete set of wood patterns s for hemp machinery; a quantity of wood corebeses [core boxes], a good assortment of spur and bevil wheel patterns, a large quantity of packing boxes and other articles. Sale to commence each day at eleven o'clock—
'Catalogues are in course of preparation, and may be had seven days prior to the sale; on application to the Auctioneer, No. 1, New Cannon-street, Manchester; or at the place of sale.'