422
Class 10.—PHILOSOPHICAL, MUSICAL, HOBOLOGICAL,North, North Central, and South Central Galleries.
I United
from making the batteries air-tight; not only is thispeculiar action stopped, but the evaporation of the waterprevented. In batteries required to act for long periods,one zinc plate should be employed, as when two are used,one of them almost always becomes negative to the other;and although this action is very slight, yet when it con-tinues constantly for several months, its effect is veryperceptible.
This clock, although quite equal to that of St. Paul’sCathedral , occupies far less space; the heavy weights,with the room necessary for their descent, being of coursedispensed with. One of the most obvious advantages inelectro-magnetic clocks is, that precisely similar time willbe kept by any number of dials situated in the differentparts of a large establishment, and connected with onependulum. Such a series has been in operation for sometime at an extensive commercial warehouse. The wholeof the dials are regulated by one pendulum, situated inthe counting-house. The wire required to communicatebetween the pendulum and the dials in the differentdepartments of the warehouse is upwards of a quarter ofa mile in length.]
129 Smith & Sons, John, Lancelot, & William,
St. John’s Square, Clerlienwell —Manufacturers.
Regulator and case, with self-adjusting pendulum,suited to any temperature, by its own action ; with baro-meter, thermometer, &c.
[Astronomical clocks are sometimes made, and yet notused in observation, but kept by clockmakers themselves,for the purpose of being used as a standard by which toadjust other clocks, chronometers, and watches not yetbrought to time; and such clocks, when so used, arecalled regulators, from the use to which they are put; andwhen they have good compensating pendulums, and thebest escapements, they differ from astronomical clocksonly in the name.—J. G.]
Detector clock, or watchman’s timepiece, for indi-cating the precise time of absence or neglect of duty inwatchmen, nightwardens, &c.; forming also a brackettimepiece.
Eight-day office dials. Eight-day church or turretclock. Church clock to chime the quarters.
Skeleton timepiece and almanac, which goes twelvemonths with once winding, and shows seconds, minutes,and hours, with the days of the week, and the month,on one dial. Skeleton quarter clock, which chimes thequarters on eight bells, and strikes on steel wire gong.
Whishaw’s uniformity of time clock and telegraphinstruments.
130 Roberts, Richard, Globe Works, Manchester —
Proprietor.
Patent alpha (church or turret) clock, the wheels andpinions made of cast-iron, with the teeth retaining thescale; it has only one weight to actuate both the goingand striking trains, and the chain or cord, requiring nolateral traverse, can be taken off in any direction. Thependulum (compensation) and the escapement (remontoire)are adapted to keep the clock at an almost uniform rate,whilst the hands being advanced at intervals of thirty(or, if preferred, sixty) seconds, afford opportunity forascertaining the time to a second.
[The striking of the hour is effected through means bywhich the blows are given at equal intervals of time, thusavoiding both the irregularity of the fan and the expen-diture of power to drive it, The upper part of the casein which the clock stands shows a simple mode of con-structing a turret, to consist of four pillars connectedtogether by as many dials, which turret it is proposedshould be placed diagonally with reference to the build-ing on which it is to stand, in which position the dial willbe better seen in all directions.!
| Watch which beats dead (centre) seconds with onlyone train of wheels, &c.
Patent recorder watch with double hands.
Patent normal drill, for drilling all the pivot, screw,and steady pin-holes in the frame-plates of watches, chro-nometers, and small clocks. A boy may drill with tinsmachine any number of watch frame-plates, so preciselyalike, that the parts that fit one of the frames will fit a ‘ lor any of the others.
[It will be seen that by varying the distance of thedrill from the fulcrum of the graduated beam, any sizeof watch-plate may be drilled from the same model-plate;and that by changing the model-plate, the arrangement otthe holes may be varied at pleasure.]
Patent synchronometer model, to show that by the apph'cation of pneumatics, a clock may be made to indicatesimultaneously the time of day on dials in various placesat a distance from each other.
Patent wheel sector. By this instrument the externaland pitch line diameters of wheels and pinions of anypitch and number of teeth are accurately ascertained.
Electro-magnet, 2) inches square, the iron of whichweighs only one pound four ounces and a half; capaM 0of sustaining upwards of 500 lbs.
Electro-magnet, three inches square, the iron of whichweighs only two pounds six ounces; capable of sustain-ing 078 lbs.
131 Young, J., Knaresborough —Manufacturer.
Skeleton timepiece.
137 Rush, G., Llsenharn Hall, Bishop Stortford.
Inventor.
Design for the improvement of the dial-plate, and re-gistering of the aneroid barometer ; so that by the addi-tion of a table engraved upon the face, it will enable thetraveller to determine approximate altitudes by simpleinspection of the dial.
138 Gray & Keen, Liverpool —Designers and
Manufacturers. ,
Wheel barometer, designed for use in naval estabhsments.
Gothic wheel barometers.
140 Abraham, John Aburgiiam, 87 Bold Street,
Barometer, designed to show, without adjustment, ttrue height of the mercurial column.
141 Jones, W. & S., 30 Jlolborn.
A mountain thermometer.
144 Brooke, Charles, 29 Keppel Street —Inventor ah'!
Designer.
Photographic self-registering magnetic, and meteolgical apparatus. » c t
The object of this apparatus is to obtain a more pe' ^knowledge of magnetic and meteorological phenonie >by continuous observation of all the changes that ° csimultaneously in the various instruments. As the u 1 =netic changes are too minute to actuate continuously,"^mechanism, however delicate, a record can be obta>by an imponderable agent only, as light. , e 0 f
Even with a staff of assistants so large that the e Jone of them should be constantly applied to every .scope, the results would be liable to errors of observa ^besides which, the magnetic changes occasionally 0 r ,too rapidly to be continuously recorded by an 0 j, 0 yalSince the apparatus has been employed at theObsei’vatory, Greenwich, the number of the staff h as erV a-reduced, and the fatiguing process of nocturnal 0 ' S u per-tions in the magnetic department has been entirely sseded. The apparatus consists of—
1. A declinometer.
2. A bifilar magnetometer. . ^ the
In these instruments, the torsion circle from whi ^
suspension skin hangs is supported by eight brass