Kisqdom.] AND SURGIGAL INSTRUMENTS.
North, Norti-i Central, and South Central Galleries.
411
masm
Tanner’s Polyliorion.
^ or a P orta hie eight-day timepiece, showing thejj ? a nd days of the week and the month.etl esi gn for a flat., portable clock, with calendar ; metal,Slaved and gilt, inlaid with malachite.t eri) Sht-day night and day timepiece, or horological lan-
fratne^ e ’S^i'" ( ^ a y clock. Improved calendar, in metal
fluart 1 e %ht-day striking clock, to repeat the hours andter s, in engraved and gilt case.
as ^* le substance here called “ malachite” is also known’"oaatam green. It is a beautiful mineral of a fine greench ° U ^’ var i e gated in a pleasing manner. It consistsen Ucally of carbonate of copper, and is found native in0ra Wall and Cumberland.—R. E.]
^ Jackson, W. H. & S., Red Lion Street, ClerkenweMjj . —Inventors and Manufacturers.
a ess lstere d soliclave lever watch : exhibited for cheap-v ar ; a, 'J 'various improvements. Specimens in gold ofand specimens incases enamelled, set in gems,
thi s d^* 63 designs; the enamelling the work of
died three-quarter plate lever watch, with enamelledGon Welled t n s ' x holes, of the same construction.doin e tt , lev . er watch, with compound balance crystalQ ’ showing the motion of the escapement,cent,.?. x timepiece with whole or dead seconds fromLev ’ a new ca iihre.
(j 0 >? r 'watch, with whole or dead seconds.
1'yfo Pocket chronometer.
hal aric 'd a y marine chronometer, and a compensationPart ’ adjustment for extremes of temperature.
°f watches, showing their construction.
33 M -
t°ORE, John, & Sons, 38 Clerkenwell Close —t-hixr,' Manufacturers,
in ro s „ m S skeleton clock to go a month. Chiming clock°od case. Skeleton clock.
34 r> -
arraud & Lund, 41 CornMtt —Inventors andMarin 1 , Manufacturers.
Co,ll Pens e t' r ° n01ne * er ’ w * t * 1 a m °d e t °P a newly-inventedt° all ,... atlon balance, constructed for exact adjustment
temperatures.
Marine chronometer, of ordinary construction.
Very small gold pocket chronometer, a specimen ofminute English manufacture.
35 Parkinson & Frodsiiam, 4 Change Alley, Comhill—Manufacturers.
Astronomical clock, with mercurial pendulum, in ma-hogany case.
Eight-day chronometer with ordinary compensation.Lever watches with compensation.
Gold chronometers for pocket.
Gold watch-cases and carriage clocks.
3G Fairer, Joseph, 17 Bishopsgate Street Without —Inventor and Manufacturer.
Improved railway guards’ timekeeper.
Improved railway station clock, showing the day of themonth.
Pocket watch for engineering purposes.
Improved electric clock, to show uniform time, irre-spective of distance, from one prime mover.
37 Robinson, P., Bishop Auckland —Designer andManufacturer.
Skeleton spring clock, which strikes the hours andquarters on modulated bells; with a compensator forcounteracting temperature. The clock and frameworkare a representation of the clock-tower and entrance tothe palace of the Bishop of Durham, at Bishop Auckland.
39 Elisha, Caleb, 13 New Bond Street —Inventorand Manufacturer.
An eight-day timepiece (regulator), to go by a weight,in a mahogany case, with a compensating pendulum.This pendulum has a brass ball, seven inches diameter,and three-quarters of an inch thick, on the face of whichis screwed a brass rim, a quarter of an inch thick and oneinch broad ; on the inside of this is a steel rim, securedto the brass, one-eighth of an inch thick. The outerdiameter of this rim, composed of brass and steel, is alsoseven inches. This rim is divided or separated at thebottom of the ball, leaving two arms of equal length ; atthe end of each is screwed a brass cup, to admit glassesof a conical shape containing mercury, about 4A incheshigh, the lower diameter being about 1| inch, and theupper about the half. The adjustments for variations intemperature are made by the compensation rim withmercury in the glasses. The escapement of the clock isof George Graham’s construction, dead-beat, but thepallets are jewelled. The vibration is made as short aspossible.
A silver lever watch, with compensation radii, composedof brass and steel united. The proportions are about 1 ofsteel and 2 of brass. The bar is screwed on to the upperplate at one end, and at the other end a hole is drilled,to admit the pendulum or regulating spring, where it ispinned in.
A silver lever watch, with compensation radii, com-posed of brass and steel, fixed on the index on the cock,the two shifting together, and acting up and down thespring as the regulator is shifted. In the outer end ofthis radii compensation, are drilled two holes for the pins,between which the pendulum spring plays.
Model of a mahogany door, with machinery. In theposts of the inside of the door are fixed two staples.. Aniron chain, case-hardened, rather longer than two widthsof the door, is drawn through the staples, and when onthe outside, the chain is pulled, so as just to admit thehand to secure a padlock into the links of the doublechain. The chain is then drawn, with the padlock, outof sight. The lock catch must also be case-hardened.