Kingdom,
AND SURGICAL INSTRUMENTS.
North, North Central, and South Central Galleries.
431
■^8 Richards, N., 3 Somerset Street , Aldgate—
Grlobe, -with an endless rotary action, named “ the geo-Pnical instructor/’
Morrison, James Darsie, (i Rankeillor Street,m*. Edinburgh — Manufacturer.
^ea lnera ^ teeth in gold plate, with compound swivels, by< 1 5 Us ,°f 'which the mouth may be opened wide withoutPacing the plates from the gums,et of teeth, the under gold-screwed,the upper gold-lined.WL? carved teeth made from the hippopotamus’ tusfc;^variety of other teeth of different styles and manu-
^ Ryles, Moses, Cobridge , Staffordshire Potteries —
* Inventor.
e v,r 11 a Pparatus, of a peculiar construction, showing the
^d flow of the tides.
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V Paxon, William, Hampstead —Proprietor.
Pha U " ar ' an ’ w * tl1 improved contrivance for showing theses of the moon.
Mathews, Mary, 16 Westbourne Street, Hyde< c Park Gardens — Inventor.
c 0n Astrorama,” with a sketch explaining its use. Adi u Cave representation of the heavens, with the apparentp] a rnal motion of the stars, and the real paths of theDe ts, folding up in the form of an umbrella.
Ashe, W. Austin, 15 Brampton Crescent — .q . Proprietor.
Ash 6a ^ c ' rc le course indicator, invented by Lieut . E. D.coj’ Ae Royal Navy. Its object is to point out theci^trhieh a ship must steer in order to sail on a greatstee/ ^tween any two places on the globe, instead ofb° u '."S by the true bearings of the port to which she iss °me • an< * thereby materially shortening the voyage, inr? '“stances to the amount of 600 miles.
Ara 1S known that the shortest line which can bei s between any two places on the surface of the globegj e arc of the great circle intercepted between them ;but . Clrc M sailing, however, cannot always be practised,Thi 11 “'“y he usefully combined with other sailings.t mstrument is adapted as a companion to Mr.l; s l/ s °n’s tables for “ Great Circle Sailing,” lately pub-e “ hy order of the Lords of the Admiralty.]
b Facy, Richard, Wapping Wall— Designer anda Manufacturer.
Plot; Vert 'cal orrery, exhibiting the diurnal and annual
of the planets ; also, showing the path of a cometof Perihelion distance is less than the mean distanceth e f erc “ r y> an <l whose aphelion distance extends beyondjg^ art hest known planet in the solar system.
ADn" 1 *™’ Major R. J., Woolwich Common —Designer.itieejFaratus, and a few small tools in a case, contrived toAurai,:,. e mss of the right hand: its objects—simplicity,
Proprietor.
ot the right hand: its objects—simpucuRereec 1 *?’ a “A cheapness. Manufactured by Gaze, 14This*-- ® tree I> Woolwich.
a Pparatus is shown in the annexed cut.
Major Little’s Artificial Hand.
197 Roper, W., Bath —Manufacturer.
The “ reelinia.” Invented by Henry Lawson, Esq.,for the purpose of enabling astronomers to use large tele-scopes with greater speed and comfort.
198 Johnston, W. & A. K., Edinburgh —Manufacturers.
A terrestrial globe, 30 inches in diameter, showing thegeological structure of the earth, the currents of the airand of the ocean, the trade winds, trade routes, mon-soons, and isothermal lines, or lines of equal temperature.The stand is carved in walnut, and was designed andmanufactured by W. Davidson. It has, at the four cornersof the base, heads emblematical of the four seasons. Sur-rounding the compass-box are figures which represent thefour quarters of the globe, with their appropriate emblems;and the circular supports of the horizon are composed ofclusters of fruit, indigenous to the quarters of the worldover which they are suspended.
[The temperature of any particular month, or any place,varies very much in different years, and its true value canonly he determined from observations made during a longseries of years. Professor Dove, of Berlin, has collectedthe observations made at nearly 900 stations on the globe,and from them he has constructed maps of the isothermallines, by joining those places, hy lines, whose temperaturewas found to be the same.—J. G.]
200 Fletcher, Peter, 11 South St. Andrew Street,Edinburgh —Manufacturer.
Pair of globes, terrestrial and celestial, with cases;showing the various stages in globe making.
201 Allan, Thomas, 20 St. Andrew’s Square, Edinburgh—Inventor.
Two pairs of patent electric telegraphs.
[The general principle upon which electric telegraphsdepend for their indications, is the remarkable fact dis-covered by Professor Oersted, that a magnetic needlefreely moving on its axis is capable of being turned to oneside by the transmission of an electric current through awire placed parallel and near to it. It was subsequentlyfound, that by placing the needle so as to surround itwith a coil composed of many lengths of insulated wire,this effect was immensely multiplied, and a very feeblecurrent became sufficient to defleet the needle so placed.The galvanometer was thus invented, and subsequently—the needle-telegraph. It is obvious that a means ofcommunicating signals was discovered when this fact wasfirst developed, since a needle thus placed might be ar-ranged at any distance, and being connected with theoperator by insulated wires, he could cause it to turn toone side at pleasure. Such is the principal feature of theneedle-telegraphs. These instruments consist essentiallyof the following parts—a source of the electric current,or voltaic battery, a medium through which it can beconveyed without loss, or insulated wires, and a magneticneedle arranged so as to be influenced by its passage,which is generally suspended in front of the index-plateof the apparatus, upon which certain marks are arranged.The movements of two such needles, and the combinationof signals which these obviously afford, form the alphabet,or signal code of the electric telegraph.—R. E.]