GUNS, WEAPONS, &o.
West End Gallery and South-West Gallery.
341
gdom. ]
3- Paddle-wheel frigate, on the wave principle; same
cl aw as the “ Terrible:”
q ' failing corvette, on the same principle, proposed by5 Pishboume, and constructed by Dr. Phipps.Princijj ™ 118 mode ^ s °f y achts an ^ steamers, on the same
128 -
U By Lieut.-Col. Hall —Producer.
Surro CI t\ ^ on °f specimens forwarded by the Ordnance
j y Department:—
scal e ~'f^ e O r .d nan ce map of England and Wales , on thereal si s 1 °- le .* ncb to a m ’ le ( e< l ua l t0 B 33 S 5 tb P art °f tliesheets Z R 111 * ts P resent state °f progress, consists of 90ip™ ’ double elephant size, mounted on linen, and form-the ^nneeted map 28J feet by 23 feet 5 inches nearly,conven ' 16 r “y published sheets having, for greaterThe 'c nce “ engraving, been divided into four parts,and the i 34 sbeets °f part of Essex were published in 1805,of la8t . sheets included in this map, consisting of partsThe C h lre an d Yorkshire , were published in 1844.now j s “eets of the north of Lancashire and Yorkshire ,fro m th C0 . ur ? e °f preparation, are obtained by reductionto ma P those counties; it being intended
an <i Wai tbe rema ’ning portion of the map of EnglandThe 1CS ° u tbe one_ inch scale,sold to^tn atest number of impressions from any one platelished i i P'llilic has been 5,500 for sheet No. 7, pub-■hvpress ' 1 * 822 ’ and on account of the large number ofrally, m° nS * ;ba4 have been taken from the plates gene-Thi s ’ w;ri n \ them are now in want of extensive repair.
du Plicat ‘ , n ever, be avoided in future, by preparingai 'e finishJjj es by *he electrotype process, as new plates
s bc 'nch ^ 6 ® r dnance map of Lancashire , on the scale ofJa°Unted S to ,? mde ( ec l ua lto isiroth P ar t of the real size),hy 27 f ee j B bneu > and forming a connected map 40 feet
°f the l'l'o^T was commenced in 1841, and the engravingCoi hpospri i . ts (each 3 feet by 2 feet), of which it isThe ph • i ust been completed.e>f hibit^ ? sica l relief and features of the ground areahitude a seiaes °f contour lines, or lines of equalthese com eve . r y 2 5 feet vertical distance apart; and“re mean , 0ur hues, together with the altitudes (abovehrarkg — ? ve I °f the sea), of a large number of benchlec orderi „ , ° n convenient and permanent sites, are
, A very ? ! be ma P-
rredge-fQ^, ?'S e Proportion of the ornament (woods anda®graved 0 , +i, nd tbe w h°le °f the altitude figures, arethe tinti n ~ tbe C 0 PP er -plates by the aid of stamps, andr. ai ’ ks and* adin g on noblemen's and gentlemen’s0r med bv amesnes > as well as that of the lands, is per- .
Ill__ eam machinery, recently introduced.
8c ale of g * Gidnance map of the city of Dublin , on th® a l sizev eet t° one mile (equal to IB ' 5B th part of th;{? 20 fg et ,»*ed on calico, and forming a connecte<l "he survey/ 14 feet 6 !nc hes.
,. av e been <.£j' as ™ a h e in 1838, but the principal detailappli ca i 1 i ec t te< \ to i847 - To render it more pecuPresent <,„ e t0 tbe Purposes of sanitary improvement. ater have bpo^ ara ® e and the pipes for the supply o3 „ e rva] s of « inserted, together with contours at equasheets eapb i et ln height. This map is published iith IV -The a u 16et 3 feet b J 2 fe ehthp SCa le of fiL nance map of the town of Liverpool, or. in., Ieal size! ml . 1 , t0 one mile (equal to ^Vth part o:jP pi 26 feg t by'j^f ° n bnen > an( l forming a connectec
W? be sufvev wn iD 0utline ’ and coloured by hand.
7 finished in ij S e°mpleted in 1849, and the engraving
ana . ,s Publisbpa® ptember 1850.
to geth IS c °nsidered to bp 6618 ^i 30 * 1 sheet 3 feet by 2 feet )
(trop r f°r anv n, “ b on as lar S e a scale as can be puiare ! S and «ffi^ lected P ublic ma P- The ornament:rj,, n graved bv ® ures > an< I small words and initialslbe altitudes stam Ps.
are given above the mpan level of the sea.
V. —Specimens of hill drawings made by G. W. Carring-ton, Esq., formerly employed on the Ordnance Survey , pre-pared for and used by the engraver as a guide in etchingthe hill features of the one-inch map of England andWales .
VI. —Specimens of hill engravings of the same sheets,by which the fidelity with which the engravers have fol-lowed the drawings may be seen.
VII. —Two engravings of hills, in trio-tinto, by Mr.James Duncan, principal engraver at the Ordnance Survey -Office, Dublin.
1 . Map on the scale of one inch to a mile of part of thecounty of Kilkenny, Ireland .
2 . Map of the same, on the scale of half an inch to amile.
The natural features of the country have been engravedon these maps (which have been reduced from the Ord-nance Contoured Survey) in a new and peculiar style,which has been named trio-tinto by the inventor, Mr.Duncan, because it combines the effects of mezzotinto,aquatinta, and stippling. It is not a tedious or a costlyprocess, and is applicable to other subjects in art, as wellas that of engraving hills upon maps.
VIII. —Contoured index map to the townland surveyof the county of Kilkenny, Ireland ; mounted on a modelof the ground in papier-machd, by Mr. William Dalgleish,engraver at the Ordnance Survey Office, Dublin .
As there is no limit to the number of models whichmay be cast in a single mould, maps mounted in a similarmanner can be produced at a cost very little exceedingthat of the same maps unmounted, and such maps willbe of essential service in elementary schools, by givingthe pupils a more correct knowledge than they wouldotherwise obtain of the relief traced out by the contourlines.
IX. — 1 . Engraved sheets of part of the Ordnance Sur-vey of the county of Kilkenny , on which the hills havebeen shaded by aid of the contour lines. Scale six inchesto one mile.
2. Outline map of the same, reduced from the above.Scale one inch to a mile.
3. Part of the contoured index map of the county ofKilkenny . Scale half an inch to one mile (equal to jj C jj r) thpart of the real size.
These specimens are intended to show the facilitiesafforded by the contours on the Ordnance maps fordrawing the hills upon them, and for giving a correctdelineation of the features of the country. *
X. —1. South-east and north-east quarters of sheet 91,of the one-inch map of England and Wales , showing- thephysical relief of the country by contour lines, or linesof equal altitude, at equal vertical distances apart; re-duced from the six-inch map of Lancashire and York-shire.
2 . The same sheets shaded as hill drawings, for theguidance of the engravers in executing the one-inch mapof England and Wales , prepared entirely from the in-formation afforded by the reduction of the contour linesfrom the six-inch map.
XI. — Small model of a portion of country nearBangor, in North Wales , and corresponding drawing ofthe same, by G. W. Carrington, Esq., late of the OrdnanceSurvey .
XII. —Plan of the borough of Southampton , on thescale of six inches to a mile, by Charles Holland, pen-sioner from the corps of Royal Sappers and Miners.Reduced from the five-feet map of the borough, preparedby the Ordnance Survey Department for the use of thelocal authorities in 1847.
XIII. —Diagram showing the principal triangulation ofthe United Kingdom of Great Britain and Ireland, ofwhich an account is now being prepared for publication.
XIV. — Specimens of electrotyping:—
1. A copper-plate of the townland survey of the countyof Donegal , engraved in 1837, and an impression from it.
2 . An electro-matrix of No. 1 , with the details erased,which have undergone alteration since the townlandsurvey was made.