AND SURGICAL INSTRUMENTS.
North, North Central, and South Central Galleries.
429
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tvl n ^ r i n e purposes. House barometer. Patent pocket^veiling barometer.
^ and improved self-registering thermometer.
“ i at ? nt micrometrical and double-image telescope, and| )lriln g* up glass,” according to Brewster, for measuringtti et ances either on sea or land. Applicable as a micro-ti 6l * ^ or t ^ le Purposes of practical astronomy; as a naval“ c eSc ?P e > f° r measuring distances at sea ; and as aglass,” for ascertaining whether a ship ist Ptoaching to or receding from the observer.
Merkyweather, George, M.D,, Whitby , Yorkshire {{ —Designer and Inventor,
jp impest prognosticator,” or, atmospheric electro-th & ne ^ c telegraph, conducted by animal instinct; fore Protection of life and property.
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4 Hewitson, J., Newcastle-upon-Tyne —Inventor„ and Manufacturer.
jA.^f-acting and self-registering tide gauge and tidaltid ator ’ recording with accuracy any variation of the^str’ ari ^ requiring no supervision. Time is kept by anjTonomicai clock, with pendulum vibrating seconds.
“ rs > minutes, and seconds shown on their respectives er C es .’ w ith the height of the tide at the moment of ob-Mt P«on, exhibited on the opposite dial. In connexionto a h t ' le instrument, other machinery is applied to exhibitdist °k ser ver, on a large scale, and to be seen at a greato r . nce , the depth of water on the bar, or over shoals,
’ 111 s iiort, at any given place.
^ Bryson & Sons, Edinburgh —Inventors andj,. Manufacturers.
W >y e models, exhibiting the various escapements ofSelf S a ^ P resen t in general use.
‘■registering barometer clock.
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Ross, Archibald Hilson, 25 Bridge Street,
^ Sunderland —Inventor and Designer.
den 0 x e ^“ c °mp e nsati n g barometer, having the scale whichfl 0at es the height of the mercurial column attached toh* the surface of the mercury in the cistern, to showd\ Sl ei ght of the barometrical column, which is the exactthj a nce between the two surfaces. Design, a Coriu-^el Co ^ Umn » supporting a figure of the late Sir Robert
157 4
Casello, Louis P., and Co., 23 Hatton Garden£ _ —Manufacturers,
an^'^i'ined comparative barometer ; designed, arranged,ri c ,,ip lai mfact u red by the exhibitor; exhibiting the Tor-pie So ^ n ’ the Cartesian , and wheel barometers, and sym-1 , 1 ] ® ter > acting in combination; with varying scales ofIm’ an <I 2 inches respectively.
i. v ed self-registering window thermometer, which,Sett; n lt P ro ‘ e cts the scale from the weather, admits ofS In S, an< l correct reading without opening the window.? oc ket barometer, adapted for measuring heights.'Ui(l ® registered barometer, made by the exhibitor,ibited for accuracy and cheapness.
Ifl8 T -
A n Lovejoy, G., Reading —Proprietor.
centr e of timepiece, consisting of a dial of glass, in thetiiRe, ^. -Wch an index-hand turns and points out thetiftie’. st •i° Ut an y mechanism. It keeps correct
to be’^J 1 the hours and half hours; and requires onlyU1 id up once in twenty-one days.
Grijioloi, Henry, 31 Brooke Street, Holborn —Ittipr Maker.
etl pediment barometer in carved gilt frame.
160 g. -
Ma DEESON , Mansfield, Nottingham —Designer,t^c cou^f coun try twenty miles round Mansfield, inChai »s;o/, 0 LN°„ttingham, upon a scale of one inch to 36’ r ->37fi feet.
160a Negretti & Zajibra, 11 Hatton Garden —.
Inventors and Manufacturers.
Standard open cistern barometer, with adjusting scale.
Self-registering barometer.
New pocket barometer.
Pocket sympiesometer or air barometer.
Standard thermometer, with comparative scales foratmospheric and chemical purposes.
Rutherford’s thermometer.
Sixes’ self-registering thermometer.
Sljet of very sensitive thermometers, for delicate experi-ments.
Registered thermometer for out-door exposure.
Three of the most approved hygrometers now in use :a Damell’s hygrometer: a dry-bulb and wet-bulb thermo-meter, and Regnault’s condenser hygrometer; the latterinstrument is so constructed as to be used like the pre-ceding one, having been altered from Regnault’s originalform, by substituting black glass for silver caps, to avoidthe necessity of cleaning the caps, an operation renderednecessary by the oxidation of metal caps.
Two distinct thermometers in one stem.
Simple and improved pressure gauge, less liable to getout of order than the ordinary mercury gauge.
[The dry and wet-bulb thermometers consist of twoof these instruments, whose readings, when under thesame circumstances, are identical. In use, one of thebulbs is covered with thin muslin, and moistened bymeans of water passing by capillary action from a vesselcontaining that fluid, and will take a temperature depend-ing on the amount of moisture in the air. If the air besaturated with moisture, there will be no difference inthe readings of the two thermometers ; but if the air benot saturated, it will take up additional vapour: thisvapour will be combined with heat, and the reductionof temperature will be shown. The different readings ofthe two thermometers will be according to the quantityof heat which has been required to change the state ofwater on the bulb to vapour. From the readings of thedry and wet-bulb thermometers, nearly all hygrometricalproblems can be solved. Ether is more generally usedfor evaporation with Daniell’s hygrometer.—J. G.J
161 Orchard, John, Kensington —Designer andManufacturer.
Standard barometer, with various improvements.
Series of rack slides for magic lanterns, to show thevaried movements of the planets.
Air-pump—having no valve to interfere between it andthe receiver, so that the air can be exhausted from thereceiver to such an extent as to freeze a vessel of waterplaced over sulphuric acid for desiccation.
162 Pizzala, Francis Augustus, 19 Hatton Garden—Designer and Manufacturer.
Wheel barometer or weather glass, with rack-workmotion, intended to supersede the use of ordinary glassweights. The case is carved in walnut, of novel design,representing the leaves, buds, blossoms, &c., of the lilac,larkspur, collomia, potato-bloom, Solomon’s seal, andother plants. The dial-plate is engraved with a globe inthe centre, surrounded by the signs of the zodiac.
163 Tremlett, Richard, 9 Albemarle Street, St. John’sSquare, Clerkenwell —Inventor and Manufacturer.Marine barometer in metal frame, with thermometer,&c., and enamelled metal scales and springs, to checkoscillation.
166 Dobbie, William, Falkirk , Scotland —Manufacturer.
Barometer, on an improved construction, which hastwo indices, the one of the common range, and the other