410
Class 10.—PHILOSOPHICAL, MUSICAL, HOKOLOGIOAL,North, North Central, and South Central Galleries.
rusiT® D
Specimen of the movements of the preceding, as madein Lancashire to the exhibitor’s calibre.
Two specimens of watch movements, to the exhibitor’scalibre.
Stethometer, to measure the comparative mobility ofthe chest in cases of disease of the lungs.
[The effect of most diseases of the lungs is to diminishthe extent of the motion of the walls of the chest. Itbecomes consequently often of considerable importanceto ascertain the amount of variation from health in thisrespect, since this points out, with approximative accu-racy, the extent of the disease. The diminished mobilityof one side as compared with its opposite thus affordsimportant results. The method of measuring and re-cording these changes by an index registration was firstadopted by Dr. Sibson, F.R.S. The present instrument,designed by Dr. Quain with the same object, is of verysimple construction, and consists essentially of a dial-plate with a moveable index, which is acted on by thepi'essure of the sides of the chest on a cord which is madeto extend around, or from one point to another of thewalls of the chest.—R. E.]
20 Newington, S., Hastings — Inventor.
Patent clock, or regulator. A common clock withspring and balance-wheel; having the hands and dial-plateremoved, and a dial substituted, which revolves in thesame way as an hour-hand. This clock is placed in a flatround box, and is arranged to show whether a person hasbeen at a particular spot at any required time.
21 Gibbs, H., 2 Nelson Street, City Road— Maker.Watch, showing double time, with improved stop-work.
22 Philcox, George, 89 Great Norfolk Street, Borough —Inventor and Patentee.
Patent marine time-keeper. This time-keeper is in-tended to give correct time in taking observations, wherea chronometer is not at hand, or as a companion to achronometer. It is adapted for use in locomotive railwayengines, to show the engineer the rate of his speed, beingthe only species of escapement not affected by the motionor tremor of a railway carriage. The construction of thecalibre for the train is a going barrel. The advantage isgetting the motive power close to the centre, and by anextra wheel in the train taking the escapement furtherfrom the centre, the defects or irregularities of the mainspring have less effect on the time, consequently theaction, or the arcs of vibration, are more regular, and thetime more correct. This train is well adapted for chro-nometers and watches. The timepiece should be woundup every day, though constructed to go two days. Theescapement beats dead half seconds.
Model of the patent “ diamond escapement,” as in-tended for the use of marine chronometers. It is muchless expensive than the detent escapement now in use ; itis not affected, as that is, by the sudden motion andtremor of the vessel, and is not so liable to stop in coldclimates. The locking is intended to be jewelled. Thiscompensating balance differs from others, having thearms resting on the brass plate.
A model of a new compensating pendulum. This pen-dulum is adapted for astronomical and other purposesrequiring correct time, showing how to correct the errorcaused by the expansion and contraction of the pen-dulum rod. The two brass arms, fixed at each end of abar of hammered steel, will, as they become heated, ex-pand, and increase the arc of the circle, thus taking upthe elongation of the steel rods. The brass expandingabout two-thirds more than the steel, will show the pro-portions required; and should the expansion of the armsbe found more than required for the steel rod, an adjust-
ment of the two screws will correct the error, and, °p cadjusted, will always correct itself. This compensati 3 !pendulum is more simple and correct than mercurial another pendulums.
Patent “ double spring.” This new principle possess*?many important advantages: it eradicates an error d? .existing in the chronometer spring in present use. y * ^the patent spring the balance of the chronometer wm *all temperatures remain in the same position unaffect 6by heat, and at the extremes of tempez*ature make 011 ^uniform rate (the patentee in this instance uses thepensating balance), thus removing the great effect p r °duced on the old principle.
23 Chevalier, Benjamin, 41 Brunswick Street ,Stamford Street —Manufacturer.Chronometer cases.
25 Brookes, Joseph, 5 Berkeley Court, Clerkenwell—Manufacturer.
A chronometer main-spring for a two-day marine cmnometer.
26 Funnell, Edw., 2 Clarence Place, Brighton —
Producer.
Small lever watch, the size of a silver three-halfp eDl1 ^piece of the present reign.
27 Gowland, James, 52 London Wall — Inventor aIlC *
Manufacturer.
Improved free pendulum regulator, for the isochron 3division of time. # , e
Patent tourbillon remontoir chronometer, in whichimpulse is imparted to the balance through the ^ala 11 ^.spring, its stud being advanced one degree or tooththe locking-plate at each oscillation.
Large model of the escapement.
Model of Earnshaw’s escapement. flli
Skeleton clock with improved compensation pendm ,Model of an improved anemometer and wind-dialvane; and of an electric clock. , gg
Various specimens of watches, including gold key 1 ^hunting lever watch, winding and setting the ha^through the pendant, and also unlocking the cover oi ^case by the same means. A gold keyless repeater, ineating the hours, quarters, and minutes, &c.
28 Tanner, William, 83 Upper Street , Islington
Inventor. ,- 0
The polyhorion (or many hour-clock) exhibits, ip 3 jJ( jtion to the local time, the time at Dublin, Paris , **Edinburgh ; it can be made to show the time at any 0 *
four places. This clock is simple and not liable to 8out of order, as one movement and pendulum re&u 1 ^the different times. This clock is represented idfollowing cut. . e •
Lever watch, set to Liverpool and Greenwich ti ^but it can be set to the times of any two places D 1convenient.
30 Davis, William, 37 Gracechurch Street —•
Manufacturer. ^
Watch, horizontal escapement, made entirely by ^f ^jyWatch movement, duplex-escapement, made enti ,by hand. Made by H. A. Davis, 57 New Street,mingham.
31 Cole, Thomas, 2 Upper Vernon St., Lloyd Sp 1 ®^
Clerkenwell —Inventor, Designer, and Maker.
Inkstand, containing requisites for writing; anding the time, the day of month, and the day of . ] a jtlwith thermometer. In metal, engraved and gilt, iwith malachite.