Kingdom.]

Class 1.— MINING AND MINERAL PRODUCTS.South Side—Areas S. 1 to S. 27.

161

very hard rock is often serious, and a work of great costand time. By the method now used three or more holesare bored as shown at a, a, a, and all fired at the sameinstant of time from the electric battery: the effect of thisis to lift up and separate the entire rock contained in thespace between a, a, a-, after this as many holes as arerequired are bored in the position shown at b, b, b, b, andsimultaneousy exploded; the effect of this is to rend therock from the side of the shaft in masses weighing tonseach; three or four holes if well placed when fired simul-taneously produce more effect than double the number ofholes would do if fired separately. Perfect safety fromaccident to the miners while blasting is secured; and it isnot necessary for any workman to leave the bottom ofthe shaft until the arrangements for firing are completed,and the power of the battery to produce the blast tested.

[The Abercarn stone, worked in the coal-grit of Mon-mouthshire , has an argillo-silicious cement, and is rathermicaceous. There are 25 feet of workable stone, andlarge blocks can be procured. It is very durable, andnot expensive. It weighs about 168 lbs. to the cubic foot.—D. T. A.] ____

431 Wales, J., Newcastle —Producer.

Model of coal mine, old flint wheel, and Davy-lamps.

432 Wood, H. L., Newcastle —Producer.Underground working of coal.

434 Taylor, R., F.G.S., London — Proprietor.

Model of the machinery and apparatus used for dressing

the inferior copper ores called halvans, at the Tywarn-haile mines, the property of His Royal Highness thePrince of Wales, in the Duchy of Cornwall, consisting of—Crushing mill, which pulverizes the ore more effec-tually than the common stamping mills.

Reservoir for receiving the pulverized mineral, andpassing it, by the action of a stream of water, to theshaking-trunk.

Self-acting shaking-trunk, in which the mineral is sepa-rated into proper sizes, for the subsequent processes, bymeans of a revolving cylindrical sieve, instead of theordinary process of shaking or stirring it with shovels ina stream of water.

A tye, for cleaning the rough grain ore which does notpass through the cylindrical sieve, and preparing for salepart of the ore which settles at the head.

Double lever jigging-machine, for dressing the poorerportion of the mineral from the tye, technically calledthe tails: by a single operation of this machine, theearthy matter is separated from the ore, and rendered fitfor sale. With some qualities of halvans, the use of thetye is dispensed with, and the rough grain comes directfrom the shaking sieve to the jigging-machine.

Round huddle, for dressing the fine-grained mineral,which passes through the sieve and settles in the shaking-runk; the ore which it contains is rendered fit for saleby bemg twice buddled.

P 1 *’ f or receiving those portions of the mineral„ f le ,v ec '? c< ;4 t0 so a powder as to be carriedof water the saakln g and other processes, by the stream

th^earfw S tr "nks, for removing a large proportion ofconcentrated m tt Mer r ° ntained in the slimes : when thusbeing twice buddled!™ ^ “ rendered &t f ° r Sale ’ by

naSt^!, menS i °^. l ! le mineral in its several states of pre-P on, and of the clean ore, accompany the model.

435 Ruel, Hugh William, 175 High Holborn—

Manufacturer and Producer.

Crucibles for assaying, &c.

436 Morewood & Rogers, Steel Yard Wharf, Upper

Thames Street —Inventors and Manufacturers.

. i • a i ent S al . van i z ed tinned iron corrugated sheet,m the erection and roofing of buildings; fire-proof,

and not liable to be attacked by vermin. Possesses greatstrength, combined with lightness.

2. Patent galvanized tinned iron sheet, corrugated, andcurved; used in the construction of roofs, verandahs, &c.

3. Patent galvanized tinned iron sheet, applicable tomost of the purposes for which zinc, iron, or tin-plate areused.

4. Sheet of galvanized tinned iron.

5. Patent stamped tile of galvanized tinned iron, usedfor roofing of buildings. Is more easily fixed than anyother kind of metallic roofing; is less liable to be dis-turbed by the wind, or otherwise get out of order; andalso packs close for shipment.

All the above possess the strength of iron, with perfectprotection from rust.

6. Sample of exhibitors’ patent tin-plate, more durableand cheaper than the ordinary tin-plate; used for manyof the purposes to which tin-plate is applied, and ismanufactured in various-sized sheets up to 8 feet longand 3 feet wide.

7. Specimens of moulded gutters and architecturalmouldings, made of exhibitors’ patent galvanized tinnediron.

8. Samples of Morewood and Rogers’s patent plumbiczinc. A new article, consisting of sheet zinc encased inlead; combines the strength of zinc with the power oflead in resisting the action of acids, &c.

9. Sample of patent ferric sheet lead. A new article,combining the pliancy (and power of resisting weatherand acids) of lead with the strength of iron. Used forroofing, and other purposes to which sheet lead is applied.May be used much thinner than sheet lead, which rendersit cheaper than that material, and it is not liable topucker and crack from the action of the sun.

10. Sample of exhibitors’ patent compound iron andcopper wire, the copper being external; possesses thestrength of iron combined with the durability and con-ducting power of copper. Used for electric telegraphand most purposes to which copper wire is applied.

11. Sample of exhibitors’ patent compound iron andbrass wire, the brass being external.

12. Sample of exhibitors’ patent compound iron andlead wire; possesses the strength of iron, with the dura-bility and economy of lead.

437 Vieille Montagne Zinc Mining Company.

H. F. Schmoll, General Agent, 12 ManchesterBuildings, Westminster —Producer.

Colossal statue of The Queen on her throne, in theattributes of royalty, eighteen feet high, in imitation ofbronze, sculptured by M. Dantin, sen., and cast in zincby M. Paillard, Paris. (Nave— Foreign side.)

Busts of The Queen and H.R.II. Prince Albert , lifesize, in imitation of bronze, sculptured by Francis.

Statuette of Sir Robert Peel , two feet high, in imita-tion of bronze, sculptured by Noble.

Eos, favourite greyhound of H.R.H. Prince Albert , lifesize, in imitation of bronze, sculptured by Francis; allcast in zinc by Karl Schroder, of London .

Model of sections of Her Majesty’s ship “ Albion,” two-decker, of 90 guns, bolted with zinc bolts and paintedwith zinc paint; by Philip Trant, working shipwright ofthe Royal Dockyard, Plymouth : these bolts and buttsdo not rust like iron bolts; they have great strength anddurability, and are cheaper than copper bolts.

Model of a frigate of 50 guns, sheathed with zinc andpainted with zinc paint; also by Trant.

[Castings in zinc are bronzed in two ways: one is simplythe application of a kind of paint, and the other is byproducing on the surface an actual coating of copper byelectro-chemical action. The use of zinc bolts is of veryrecent introduction; they appear less liable than iron tocorrosion, unless they form part of a galvanic current,when they are rapidly destroyed. Zinc castings bronzedare very durable, and can be produced at a moderate cost.—R. II.]