400
[United
1 Bennett, John, 65 Cheapside —Inventor andManufacturer.
A regulator, which beats half-seconds, with mercurialpendulum; adapted for reading-rooms, railway stations,and other places where an exact time-keeper is requiredat a small expense, and where economy of space is anobject.
Hall clock—in a carved oak case, of new design;chiming the quarters, and striking the hours on a gong.
Finished specimen of marine chronometer.
Model watch on a magnified scale; constructed to showthe most compact form of the modern watch, with allthe recent improvements; to which is attached a peculiarmode of regulation, by which the wearer, with one touchof the regulator (fixed on an endless screw) can correctany variation of time.
Model watches in gold cases for pocket use; jewelledin thirteen holes. Comprising, in a simple form, essentialsfor its correct performance in all climates; with a goldchain of new design. Exhibited to show the introduc-tion of a variety of ornamental detail, coloured by meansof different bases of alloy, without the aid of eitherenamel or precious stones.
Time-keeper, for railway guards, constructed to com-bine cheapness, strength, and exact performance.
Specimens of standard thermometers, with ivory andbox-wood scales.
Bennett’s registered illuminated night timepiece, at-tached to a Palmer’s candle lamp, by the burning ofwhich a spring gives motion to the hands of the dial withgreat exactness.
Carriage clock, in rosewood case, with detached leverescapements and compensation balance.
A regulator, beating dead seconds, with mercurial pen-dulum, in the simplest form of case and movement com-patible with strict nicety of performance.
Cathedral clock dial of plate-glass, and of new design;weather-proof; with a movement in action.
A wind dial in action from a vane above the roof of theExhibition Building, with a self-recording machine forregistering the wind’s force.
2 Adams, F. B., & Sons, 21 St. John’s Square ,Clerkenwell —Manufacturers.
No. 1. Gold open-face, double-back, cased watch;enamel dial, first class, full plate movement, lever escape-ment, capped, eight holes jewelled, and compensatedbalance, &c. This description of watch is used in thenorthern states of America .
No. 2. Similar watch, with gold dial. This is made atone-third the cost of Nos. 1, 3, or 8.
No. 3. Gold watch; enamel dial, first class, three-quarter plate movement, duplex escapement, ten holesjewelled, compensated balance, &c.
No. 4. Watch like the preceding; three-quarter platemovement, lever escapement, five holes jewelled, andgold balance.
Nos. 5, 6, 7, 8. Gold watches; first class, three-quarterplate movement, lever escapement, full jewelled, compen-sated balance, &c.
Nos. 9, 10. Gold watches ; gold dial, full plate move-ment, lever escapement, jewelled, plain balance (forladies.)
Nos. 11, 12. Gold watches; first class, three-quarterplate movements, lever escapement, eight holes jewelled,compensated balance, cases enamelled, and ornamentedwith diamonds.
No. 13. Gold watch; enamel dial, showing secondsfrom the centre, without additional train.
No. 14. Gold, engraved, double-back, hunter-casedwatch; first class, three-quarter plate movement, duplexescapement, twelve holes jewelled, compensated balance.This description of watch is used in the East Indies,Persia, Spain, and South America .
No. 15. Silver, open face, double-back, cased watch;lever escapement, capped, and four holes jewelled.
No. 16. Silver hunter engine-turned watch, verticalescapement.
No. 17. Silver pair of case watch; vertical escapement*
Nos. 15, 16, and 17, are used by artizans and labourers.
No. 18. A three-quarter plate finished movement Jeve 1escapement; eight holes jewelled, gold balance. This a e 'scription of movement is adopted for the purpose of ob-taining a thin watch.
No. 19. A full plate finished movement, lever escap e 'ment, eight holes jewelled, compensation balance, See.
No. 20. A finished movement, vertical escapement.
The same workmen, in their various branches, ^ ereemployed upon No. 1, the largest, and No. 1Lsmallest of these watches.
3 Olorenshaw, Joseph, and Co., 15 Northampton
Clerkemcell, London , and Oxford Terrace , Coventry'*'Manufacturers.
Two-day marine chronometer.
Specimens of gold and silver watches and watch mo ve 'ments in three-quarter and full plates, with duplex, p ate j\diamonds, and detached lever escapements. Various*/jewelled and finished.
: Ordnance Survey Department. —L ieut.-Col. Ha*' 1 '—Producer.
Base-measuring Apparatus .—Two compensation bars, aIone connecting compensation microscope. 0 f
These compensation bars and microscope form p ar ia base-measuring apparatus, invented by Major-GeneColby, Royal Engineers, formerly Superintendent ofOrdnance Survey .
Description of Compensation Bar. —1. The compensa^jjbar consists of two bars of brass and iron, 10 feet l'hlong, 0-5 inch broad, and T5 inch deep, placed l* 1 jinch apart, supported on brass rollers, at one-fourth aIthree-fourths of their length, and firmly fixed t0 S e . c j aat their centres by transverse steel cylinders 1*5 in ctin diameter, and being free to expand from or coa ^ etowards their centres independently of each other. At , gextremity of, and at right angles to, each of these b a *^aflat steel tongue, 6*2 inches long, 1*1 inch broad,
0*25 inch thick ; projecting 3*25 inches on the side ot ^iron bar, and moving freely on conical brass pivots,into the brass and iron bars, each axis being perpend 10 -, ^to the surface of the tongue, allowing it to be inclineslightly different angles to these bars according toexpansion from, or contraction to, their centres.centres of the two axes are at 0*5 inch and 2*3 inches 1 ,
the end of the tongue next the brass bar. On the tong . gand flush with its upper surface, near the extremity*inserted a silver pin, with a dot marked on it, as the cpensation point. . e p-
The bars are placed in wooden boxes (made of ^asoned straight-grained deal), to the bottoms ofare fixed the plates that hold the brass rollers on
seasoned straight-grained deal), to the bottoms or . c j,are fixed the plates that hold the brass rollers on ^j 09 lthey are supported, and having in the middle a i, e -brass stay, screwed to the box, and passing upwar 1 n. gtween two steel cylinders, to prevent the barsmoved longitudinally in their casing. To protec stongue carrying the compensated point (which t0beyond the wooden box) from injury, nozzles are nxthe boxes, having a small circular orifice with a lm 0 ^ e
upper side to allow the dot, or compensation point,seen. ^ a t-
On one side of the connecting steel cylinders,tached to the brass bar only, is placed the longi* 1 gSlevel, the lid of the box being furnished with overtb 0window and shutter, to enable it to he observed. u p 0 rrollers which support the bars are two pieces ofpreventing any sudden jar from striking the bars , t ],ethe lid of the box. At each end, on the outside> gg 0 fbar-box a thick metal plate is screwed, for the pn sU p-firmly fixing a three-armed groove-stand, intende. ^ a t
port the tripod of the compensation microscope , s ] llL ceach end of the box are two vane sights ("p’j n g tb edown with hinges into grooves), used for P labars approximately in line.