HOROLOGICAL INSTRUMENTS. [ 3218 ] Adams, F. B., & Sons, 21 St. John’s Square, London.—Patent reversible chronometer; duplex and lever watches. [ 3219 ] Agar, William, Burr/, Lancashire.—Specimens of working men’s watches and independent centre seconds, manufactured in Bury. [ 3220 ] Armstrong, Thomas, Inventor and Manufacturer, Manchester. ■ watchman’s detector clocks, steam or speed clock, &c. The following are exhibited:— Armstrong’s improved Armstrong’s Improved Watchman’s Clock is an ordinary office Timepiece and Watch man’s clock combined, for indicating punc tuality and registering the neglect of it. It is entirely self-acting, portable, simple in construction, and requires little attention. Price, in plain mahogany case, dial 14 inches diameter Armstrong’s Improved Watchman’s Clock, same as the above, but in a more highly ornamented ease, dial 12 inches diameter . Armstrong’s Improved Steam or Speed Clock indicates the amount of work done in all establishments where steam-power is used. It also compels the engineer to work at the required pressure, by indicating any neglect. In mahogany case complete, for fixing 5 10 0 [ 3221 ] Aubert & Linton, 252 Regent Street.—Watches with’ recent improvements; ornamental clocks for the table and mantelpiece. [ 3222 ] Bailey, John, & Co., Albion Works, Manchester.—Improved turret clock in tower, suitable for a market-place, &c. [ 3223 ] Barraud & Lund, 41 Cornhill, London.—Chronometers and watches. [ 3224 ] Bayliss, William, Finmere, Oxfordshire.—Model of new remontoire escapement, as put up in Finmere church clock. [ 3225 ] Bennett, John, F.R.A.S., 64 & 65 Cheapside, and 62 Cornhill. — Marine and pocket chronometers; public and private clocks; every description of gold and silver watches. Class XV. ( 65 ) F