ADVERTISEMENTS. 



EMIGRATION.— LAND SURVEYING IN THE COLONIES. 



MR. HENRY CASTLE, Lecturer on Land Surveying and Level- 

 lino;, a t King's College. London, Author of a Treatise on the same 

 subjects, and formerly Boundary Commissioner to the Home District, Upper 

 Canada, is forming a FIELD CLASS on the Circumferentor and the method 

 of Surveying peculiar to new Countries. 



Fee for the Course, to commence the 26th April, Five Guineas. Apply at 

 30, Queen-square, Bloomsbury. 



P.S. The College Classes will be resumed at the same time. 



LAWRENCE & CO., 55, PARLIAMENT STREET, WEST- 

 MINSTER, and 10. YORK PLACE. LAMBETH. Successors to the 

 Patentees and Manufacturers in Zinc to her Majesty the Queen Dowager. 

 Original makers of Malleable Sheet Zinc. Bars, and Wire. Drawers of Tubes, 

 and Sash-bars. Perforated Zinc, for Larders. Safes, and Blinds. Roofs and 

 Yerandas covered with Zinc. Rain Pipes. Chimney Pipes, Cowls, &c. Gut- 

 ters, Ridges, and Sky Lights. Baths and Zinc Door Plates. 



Garden Lights, VVardian Cases, and Conservatories. 



N.B. The Trade supplied. Patent Smoke-curers, and Chimney-shafts. 

 Fine Sweedish Steel, wholesale, retail, and for export. 



TO BUYERS OF IRON CASTINGS. 



UNDERGROUND PIPES, for Gas or Water, Railway Chairs, 

 Wheels and Columns. Beams or Girders for Buildings, Palisading and 

 Coping. Sash Weights, Furnace Bars, Hot Water Pipes, Large Doors. Piles, 

 Posts, and all sorts of heavy castings made very expeditiously to order or 

 pattern. — Apply to James Robertson and Co., Jamaica-street, Glasgow, or 

 G. O. Robertson, Esq., 6, Crescent, Minuries. London. 



This day. in Svo., 14s., cloth, lettered. Simpkin and Marshall, London. 



A TREATISE ON LAND-SURVEYING AND LEVELLING, 

 with copious Field Notes, Plans, &c, Logarithms and Traverse. By 

 Henry John Castle, late Boundary Commissioner to the Home District, 

 Upper Canada, and Lecturer on Practical Surveying at King's College, 

 London. 



" Justifies the promises of the preface — a complete vade mecum.'' — Atlas. 



" A very useful book — no pains spared to make it so." — Railway Mag. 



" Invaluable to the young surveyor in our Colonies.'' — Shrewsbury News. 



" A useful book on the general subject — a vade mecum."— Surveyor and 

 Engineer. 



" Treated clearly — bids fair to be useful to the student.'' — Ath 



THE ARTIZAN. 

 A Monthly Journal of the Operative Arts. Price Is. 



No. 3, just published, contains the following: 1. The Association of the 

 Proprietors of Steam Shipping. 2. Sanitary arrangements in large towns. 

 3. Table of the dimensions and cost of Railway Bridges. 4. Expansion of 

 Steam in Locomotives. 5. Carpenter's Mechanical Philosophy. 6. Our Club, 

 No. 3. 7. Transactions of the Institution of Civil Engineers. 8. The London 

 Breweries. 9. Table of Railway Gradients, &c. 10. The Building Arts. 

 11. Metropolitan Improvements. 12. Report of the Railway Department of 

 the Board of Trade. 13. Anatomy of the Steam Engine. No. 3. 14. Physi- 

 ology of the Steam Engine, No. 3. 15. Analysis of Books. 16. Marvels of 

 the Day. 



The two last heads are intended to contain all that is new in the literature 

 of the arts, and an account of all new discoveries, inventions, and construc- 

 tions. All the articles are original, and no letters are admitted 

 Opinions of the Press. 



" Displays technical knowledge, literary ability, and searching investi- 

 gation.'' — Spectator. 



" We are indebted for this searching inquiry to a new scientific periodical 

 of great promise, entitled The Artizan. — Polytechnic Journal. 



" The Artizan, a new Journal of good promise, devoted to the same sub- 

 jects as our own.' — Mechanics' Mag. 



" No. 2 improves upon its predecessor; and the work does much credit to 

 all engaged upon it." — Monthly Times. 



" We have been presented with the first Number of a London Periodical, 

 called The Artizan. a Monthly Journal of the Operative Arts. v. Inch we have 

 much pleasure in recommending to those of our readers who are engaged in 

 Engineering and Ship-buildii g. or who take an interest in scientific matters." 



" A periodical that would give a decided and unbiassed opinion on those 

 subjects has been much wanted, as most of the scientific journals of the day 

 are too apt to state opinions favourable to the inventor or executor of a work 

 of art, without considering that in so doing they are deceiving the public.'' 

 — Greenock Advertiser. 



Simpkin, Marshall, & Co., and all Booksellers. 



TRANSPARENT DRAWING AND TRACING PAPER. 



REDUCED IN PRICE.— TO CIVIL ENGINEERS, ARCHI- 

 TECTS, & SURVEYORS.-] J. DIXON, after a number of years' study, 

 has made perfect a moat beautiful (Crystographic) TRACING PAPER, very 

 transparent, which will take ink, oil. and water colours, without running. The 

 price is very low, and the following are the sizes:— 



30 by 20 ... . Double Crown .... is. per quire of 24 sheets. 

 40 by 30. . . . Double Double Crown . Is. 6rf. 



Yellou Imitation of French 12s. „ ,, 



Also, DRAWING PAPER MADE TRANSPARENT, for Tracing on, 

 all the dirlerent sizes from 20 by 15 to 66 by 47 in. Which can be sent to 

 any part ot the three Kingdoms, by a remittance of Cash, or a Post Office 

 Order. Address to the Manufactory. H. DIXON, No. 194, Strand, near 

 Temple Bar, London. 



THOMSON'S IMPROVEMENTS IN HORTICUL- 

 TURAL HEATING, Sec. 

 J THOMSON, late Head Gardener to His Grace the Duke of 

 • Northumberland, at Syon House, and for many years in the Garden 

 Establishment of Her Majesty, has introduced an improved mode of applying 

 the Pipe Tank ami Trough System, for bottom and top heat to hothouses 

 and other horticultural erections, by which the perpetual nuisance and labour 

 attending the continual renewing of tan. dung, and other fermenting mate- 

 rials, commonly used to produce bottom heat, are obviated. The apparatus 

 can be fixed so as to produce a humid or dry atmosphere at will ; and the 

 expence does not exceed half that of any other plan of hot water. 



F'9-S. 



Pipes for Bottom & Top Heat. Troughs for ditto 



The above plan of applying the Pipe T:ink and Trough System of Heating, 

 combined with his newly invented and economical boiler, has been adopted 

 by. and may be seen at, the two largest Horticultural Establishments in 

 Great Britain, viz., Messrs. Lees' Nursery, Hammersmith, and Mr. Wilmot's, 

 Brentford or Isleworth. — Designs and Estimates for warming horticultural 

 erections, public or private buildings, &c, may be obtained on application to 

 J. Thomson, Landscape Gardener, 4, Chapel Place, Hammersmith. 



J. T. has applied the above system for bottom heat to pines, and for other 

 purposes at Lord Prudhoe's, and several other places in England, with great 

 success, within the last six years. 



TO ARCHITECTS, ENGINEERS, SURVEYORS, AND OTHERS. 



WHOBCRAFT respectfully calls the attention of the above, 

 • and all persons requiring accurate Rules, Scales, and Mathema- 

 tical Instruments, that from the advantages he possesses, being a Manufac- 

 turer, he is enabled to supply them with goods of a superior quality, at 

 prices reduced considerably below those usually charged, by which from 15 

 to 25 per cent may be saved. Rules and Scales of every description for Me- 

 chanical and Scientific purposes made to order on the shortest notice. Le- 

 velling Staves, Optical and Philosophical Instruments, equally reasonable. 

 Merchants, Captains, and the Trade supplied on advantageous terms. Coun- 

 try orders, containing a remittance or an order for payment in London, 

 promptly attended to. 



W. Hobcraft. 38, Princes-street, Leicester-square, London. 

 Books of Instructions, gratis, with Sbde Rules. 



AMERICAN STEAM EXCAVATING (Ottis', New York) AND PILE 

 DRIVING MACHINERY. 



COMPLETE DRAWINGS to a large scale, together with every 

 detail of these machines, may be had of 



GEORGE SPENCER, 

 26th March, 1842. Draftsman for Machinery and Patents. 



G. S. respectfully offers his services to the profession'and to patentees in 

 preparing working' or finished drawings of every description of machinery. 



SEY'SSEL ASPHALTE COMPANY', " Claridge's Patent." Estab- 

 lished March, 1838. — The extensive patronage which this valuable 

 MINERAL production continues to receive from the most eminent ARCHI- 

 TECTS and ENGINEERS in this country and abroad, distinguishes it from 

 the numerous fictitious compositions which its reputation gave rise to, but 

 which having been found very inferior to the original material, most of them 

 have ceased to be used. Its merits being well known, it is only necessary to 

 refer to a few of the public works already executed and now in progress.— 

 On the London and Greenwich Railway, and Joint Station, London Bridge, 

 430,000 superficial teet ; several thousand feet at the Great Western, Bir- 

 mingham, Midland Counties, South-western, Brighton, Blackwall, and other 

 Railways: covering of Arches at the South Metropolitan. Highgate, and 

 Nunhead Cemeteries; the covering of the Casemates at the Perch Rock 

 Batterv, Liverpool ; the Pavement m Whitehall ; the Carriage-drives at the 

 Horse 'Guards, and at the entrances to the Park by A ps ley House ; the 

 Cells anil other apartments of the new Prison at Hereford : several works at 

 jhe Stations on the Dublin and Kingstown Railway ; and many other public 

 and private works in different parts of England. Ireland, and Scotland. 



A Scale of Prices, with Books of Testimonials, can at all times be had at 

 the Company's Depot, where specimens of its various applications maybe 

 seen. J- FARRELL, Secretary. 



Seyssel Asphalte Depot, Stangate, near Westminster Bridge. 

 March, 1843. 



FROM "THE TIMES." 



December 5, 1842. 

 " Many of our readers may, perhaps, remember that some years ago, ami 

 previously to the introduction of Asphalte into this country, we expressed 

 our admiration of the pavement, composed of that substance, in Paris, and 

 especially of that in the Place de la Concorde, the whole of which has been 

 long since paved with Asphalte. It now behoves us to point out the piece of 

 Seyssel Asphalte laid down in April, 1838. in Whitehall, opposite the Horse 

 Guards, as equal to the pavement in the Place de la Concorde, or in any part 

 of Paris, and considering that its thickness is only half an inch, its having 

 so long stood the traihc of so great a thoroughfare, without any apparent 

 change, except a greater smoothness of surface, is very remarkable." 



