The Sun.
London, England, 1840-12-18 00:00:00

1. On the expansive property of steam, according to the
density of the atmosphere and the power exerted on the piston.
This to include stationary engines, whether condensing or high
pressure, as well as the locomotive. 2. On the mechanical
structure of the steam engine. S. On the velocity of bodies
on planes, when a certain force is applied, particularly referring
to inclines or declines, in order to show when it is necessary to
increase or diminish the force of the engine. 4. On the tan-
gent at which, at any given velocity, the engine is likely to go
off the rails when running en the curves. 5. On the strength
or size of ropes or chains necessary to draw weights or loads on
the railroad, whether on inclined planes or not. 6. On the
strength of tubes 17.quisito for boilers, aid on the proper weight
with which to load the safety valve. 7. On the power of trac-
tion on engine or rail. if. Oa the quantity of water and coke
required per mile. 9. On the resistance of the atmosphere in
high winds.
The Course will consist of Lectures occupying Three Months,
at the rate of Three per Week ; and the Hours of attendance
are from Seven until Eight in the Evening, is the Theatre of
the Establishment. Fee for the Course, Two Guineas. The
Theory of Steam and of the Engine will be taught by the Pro-
fessor of the Institution, assisted by an experienced DRIVER
(originally a LOCOMOTIVE ENGINE MANUFAC-
TURER) in the PRACTICAL DEMONSTRATIONS.
The Pupils will have the use of large Sectional and Working
Models, of Locomotive, Stationary, and Marine Engines, with-
out additional expense. An Examination of the Pupils will
take place at the end of each Course of Lectures, to which the
Directors and Officers of the Railroads will be invited; and no
Pupil to receive a Certificate from the Institution unless he
passes this public examination satisfactorily.
N 11. Analyses, and Assays of Minerals and Earths.
Further particulars may be had, by applying to Mr. Long-
bottom, Secretary, at the Institution, 309. Regent-street.

39, ALBEMARLE-STREET, PICCADILLY, (opposite
the York Hotel), and
76, KING WILLIAM-STREET, BANK of ENGLAND.
QIGHT .AND HEARING. - 'TESTI-
MONIALS on the Messrs. S. arid SOLOMON S'
newly-inverted SPECTACLE LENSES and INVISIBLE
OPERATIVE VOICE CONDUCTOR for leaf Persons.
,‘ We, the undersigned, have been for some time making
use of Messrs. Solomons' newly-invented Spectacle Lenses;
the astonishing relief they afford to imperfect vision gives
them the decided preference to every other kind of Lens
—the clearness of the transparency brings every object very
distinct, and enables individuals to view the most minute par-
ticle with perfect accuracy. They are particularly pleasant
by candle light, as they appear cooling to the sight, and soften
bright and brilliant lights :
James Blundell, Esq., 101. D., 1, Great George-street, West-

minster.
George G. Sigmond, Esq., M.D., 24, Dover-street.
T. J. Pettigrew, Esq., 74. D., F.R.S., Saville-row.
John Ramshotham, Esq., 111. D., Broad-street-buildings.
Anthony White, Esq., Surgeon, 3, Parliament-street.
John Hooper, Esq., Surgeon, 99, Newington-place, Kennington
Frederick Leighton, Esq., M.D., 7, Upper Gower-street.
R. Noble Elwyn, Esq., Surgeon, 36, Albemarle-street.
Messrs. Griffiths and Duncan, Surgeons, 3, Leadenhall-street.
W. Day, Esq., Surgeon, Isleworth.
T. Dally, Esq., Surgeon, 33, New Broad-street.
R.H.Lucas, Esq., NI.D., Exeter.

J. Taylor Gordon, Esq., M.D.
Wm. Bowie, Esq., M.D., Bennett-street, Bath.

C. Heywood, Esq., M.D., Blandford.
Henry Lawrence, Esq., M.D., Tenby.
Wm Jeafreson, Esq., Surgcon-oculist, 21, South Audley-street.
S. D. Robinson, Esq., M.D., Cheltenham.

C. Shillito, Esq., M.D., Brighton.
William Conolly, Esq., M.D., Cheltenham.
E. H. Allnatt, Esq., M.D. Wallingford.
Thomas Willis, Esq., M. D., Brighton.
G. Griffiths, Esq., Surgeon, Hammersmith.
John Kenderick, Esq., Surgeon, Manchester-street, Munches-

ter-square.
Charles Tunally, Esq., Surgeon, Camden-town.
Colebourn, Esq., Surgeon, 2, flarleyford-place, Ken-
nington.
N. 111.Cann, Esq., Surgeon, 50, Parliament-street.
Samuel Banner, Esq., Surgeon, 26, Berkeley-square.
W. Jones, Esq., Surgeon, 15, Lower Brook-street, Grosvenor.

square.
W. English, Esq., Surgeon, Denmark-hill.
A. Barklemon, Esq., Surgeon, 10, Charlotte-street, Blooms-

bury.
R. J. Pollock, Esq„ Surgeon, Kensington.
E. Stoddart, Esq., Surgeon, 32, Golden-square.
J. H. Walker, Surgeon, 23, Charlotte.street, Bloomsbury.
C. lligham, Esq., Surgeon, 46, Davies-street, Berkeley-square
Edward Nasals, Esq., Surgeon,Nuneaton, Warwickshire."
In placing the above list of Testimonials before the public,
the Messrs. Solomons, Opticians and Aurists, state that their
INVISIBLE OPERATIVE VOICE CONDUCTOR, by
which thousands of Deaf Persons have been greatly benefited,
is not larger than a seven-shilling-piece, and when fixed into
the cavity of the ear is soft and easy, and not more uncomfort-
able nor perceptible than having a piece of wool in its place.
By its use the faintest whisper at a public assembly is heard
witA distinctness.
These important new inventions are patronized by their Ma-
jesties the King and Queen of Hanover and their Royal High-
nesses the Princesses Augusta and Sophia, her Serene High-
ness the Princess Esterhazy, the Princesses Mary and Rosa,
her Grace the Duchess Dowager of Bedford, and their Graces
the Archbishop of Canterbury, the Dukes of Devonshire and
Manchester, &c. &c.
39, Albemarle-street, and 7d, King William-street, Bank.

TO SHIPPERS, ONVANERS, CAPTAINS, and OTHERS.
Copies of Testimonials, Gratis, by all Agents.
GRIMSTONE'S EYE SNUFF.—linder the
Patronage of his late Majesty, her Royal Highness the
Duchess of Kent, and the Lords of the Treasury, is universally
recommended by the Faculty for its efficacy in removing dis-
orders
incident to the Eyes and Head.
tSIGHT RESTORED!—NERVOUS HEAD-ACHE
AND DEAFNESS CURED!
By the most simple, delightful, and fragrant Compound !
Its mode of application is fraught with pleasure. ; many thou-
sand cures have been accomplished by its use, at a trifling ex-
pense, yet certain in its operation. If testimonies be necessary
to induce' the sufferer to make trial, Kings, Lords, and Com-
mons have used it. The Lords of the Treasury have sanctioned
its use. Their late Majesties, the Duchess of Kent, the most
eminent Oculists, Medical Practitioners—with that gigantic
balance, the Press—have eulogised Grimstone's celebrated
Herbaceous Compound, known as " Grimstone's Eye Snuff,"
for its efficacy in removing all diseases incident to the Eyes and
Head. G. J. Guthrie, Esq., F.R.S. See J. B. Lachfield,
Esq.'s Letter, Whitehall. Dr. Thomas. Dr. Andrews calls
it a national blessing—see his Reports touching its utility. The
late Mr. Abernethy, with many others, recommend Grim-
stone's Eve. Snuff, and call it " Man's best Friend," and the
" Student's Vade Mecum."—See the many thousand Letters
of Testimonies, of undoubted medical authority, with others of
the first respectability.
Abstract of a letter from Mrs. L. S. Brewer. Dress-maker,
3, Edge-terrace, Kensington Gravel Pits.
To Mr. Grimstone, Inventor of Eye-Snuff.
Dec. 5, 1840.

Sir,—l have been a sufferer for seven years, both eves being
so swollen as to cause blindness. Among the many Medical
Gentlemen who attendea me was the famous oculist, Dr.
Alexander ; indeed. I do believe my case was beyond all their
skill. " Physic, Bleeding, Blistering, with a seton, of all
kinds of Lotions, but no relief," till chancing one day, being led
by your house in 39, Broad-street, Bloomsbury, my guide
inquired if I had tried your Eye-Snuff, on which I purchased
a Is. 3d. Canister, opened it in the shop—took some, and was
greatly relieved before I reached my home. I can with truth
assert, and make oath if required to do so, that it was your Eye-
Snuff cured me. Shall be happy to answer any inquiry.

I Dili,- Sir, yours grtefully,
L. S. BREWER.
Observe the Caution*.--W" GRIM
STONE is the sole in-
• . in-
ventor, and the only genuine is prepared by him.
This Odoriferous Herbaceous Compound of Herbs is sold in
canisters, at Bd., is. 3d., 2s. 4d., 4s. 4d., as., and 15s. 6d.
each, by the Proprietor, W. Grimstone, at 39, Broad-street,
Bloomsbury, and can be obtained in all the principal towns and
cities. A liberal allowance to shippers, owners, captains, and
all vendors of Grimstone's Eye Snuff. This celebrated Snuff
is shipped to all quarters of the globe, and retains its benign
qualities in every climate. All Snuffs and Cigars shipped on
the shortest notice.