In all these
attempts to advance the art of ordnance, it was
the state of art of barrel stock that was
inadequate, and advances in the subject of
metallurgy passed from the mechanic and gun
maker to that of the iron and steel maker.
Rivalry is
considered the greatest stimulant to the
advancement of successful design and
technological advances. This was evident in the
efforts of Sir Joseph Whitworth versus those of
Sir William Armstrong.
What
collector or arms student has not heard of Sir
Joseph Whitworth? And what do they really know
about him? Perhaps only that he was associated
with bolts and nuts and an hexagonal bore rifle.
Born at Stockport
(near Manchester) in 1803 on 21 December,
Whitworth was educated at a school run by his
father. At age 14 he undertook employment with
his uncle, a cotton spinner in Derbyshire,
where, in the ensuing four years, he learnt to
run and repair the machinery associated with the
trade. Subsequently, he served in the
engineering establishments of such able masters
as Maudslay, Clement and Holtzappfel, where he
gained practical knowledge of machinery.
The year 1833 saw
his commencing his own business in Manchester,
manufacturing engineering tools and devoting his
energies to the goal of greater accuracy in
measuring with precision and the achievement of
true plane surfaces. His measuring precision
was down to one ten thousandth part of an inch,
taken at a temperature of 62° Fahrenheit as a
standard. He wrote papers on mechanical
subjects, and a new era was born in the history
of mechanical science, with degrees of accuracy
becoming possible in engineering practice that
had hitherto been considered unobtainable.
Whitworth saw that
there was an urgent need to establish a uniform
system of screw threads and this engaged his
attention. At that time, almost every engineer
espoused an idiosyncratic thread form and pitch,
thus preventing the product of one establishment
from being used in or repairing the product of
another. While producing a uniform system of
pitches and adopting the most suitable
threadform for his system, many of the sizes
Whitworth used were adopted directly from
existing practice. In recognition of this
important work of standardisation, his name was
adopted for the system. Most people recognise
the Whitworth name as being associated with the
thread system that is now being superseded by
the metric system (which is based on divisions
of a metre and a 60° thread angle). The
Whitworth system uses divisions of an inch and a
55° thread angle.
During the course
of 1853 Whitworth visited the USA. While there
he inspected Springfield Armory, amongst other
establishments, and reported on the use of
machinery in the manufacture of firearms. An
approach was made by Lord Hardinge, Master
General of Ordnance, in 1854, for Whitworth to
investigate the manufacture of the Enfield Rifle
and its performance, which had not reached the
expectations of the Board of Ordnance.
Another request by
Lord Hardinge, to supply a set of machines to
manufacture the Enfield rifle, though lucrative,
was deferred until he had established the real
cause of the unsatisfactory performance of the
rifle. This, he was convinced, lay in the
method of manufacture of the barrel.
The Lords of the
Treasury agreed, in May 1854, to build a
shooting range in Manchester 500 yards long, 16
feet wide and 20 feet high, a mobile target,
shooting rest and screens, to identify the
flight of the projectiles. Two military
officers were detailed to assist the
experiments, and an association was formed with
Mr. Westley Richards for his gun making
experience.
The making of the
barrel was considered of the utmost importance,
and we quote from the text of J.E.Tennet:
“For this purpose
it occurred to him to construct a rifled barrel,
cast in longitudinal segments, in each of which,
the line of junction was to follow the course of
the spiral. These, when placed together, so as
to form a barrel of a spiral polygonal shape
internally, were to be secured externally by
hoops of wrought iron or steel, applied in one
or more layers. From this design a barrel about
13 inches long, made to musket size as to bore,
was found to shoot with such accuracy, as to
excel all others tried in competition with it.
This idea was developed in barrels of all sizes
up to the heaviest guns.”
Having settled on
a six-sided, double triangle form as having the
most strength, the application to patent
Hexagonal Rifling was lodged in the same year,
1854.
The Board of
Ordnance had fixed the weight of the rifled
musket, the weight of its charge and projectile
relevant to the load limit for a soldier to
carry as well as the amount of recoil to be
sustained. Improvement in performance was
constricted by these parameters. For an increase
of range and penetration, indications were
favouring a decrease in the diameter of the
projectile.
As Whitworth
experimented with rates of twist, it was to no
avail that the centre of gravity was positioned
towards the front portion of the projectile when
tied to the existing rate of twist. An
inadequate rate of rotation produced by the
twist of one turn in 78 inches was dispensed
with in favour of a rate of one turn in 20
inches, after experiments ranging from 78 to 5
inches.
Meanwhile, the
Board, requiring such a quantity of rifles as
could only be provided by the Birmingham trade
over a period of 20 years, had proceeded to
obtain American made machinery for stock making
from the Ames company, steel working machines
from several sources, including those purchased
from Robbins & Lawrence in 1851, to equip the
new factory at Enfield Lock. Subsequently
further machines were sourced from Greenwood &
Batley of Leeds.
Into this scene
came James Henry Burton, formerly of Harpers
Ferry Armory, and consultant to the Ames
Stockmaking company. Burton was engaged to
install and oversee the operation of the new
facility. He moved with his family to Enfield
in England in 1855.
Returning now to
the results of Whitworth’s experiments, he found
that by using a round conical projectile in his
hexagonal bore, a much improved result occurred
when the bore was reduced to .450. This was
even further improved by the introduction of an
hexagonal projectile, which was a mechanical fit
in the bore. It did not need to be upset to fill
the bore, thus obviating any loss from gas
escape by an imperfect upset of a circular
projectile.
This hexagonal
design was incapable of stripping the rifling
due to its mechanical fit. By using a
composition of 10% tin and 90% lead in the
projectile, this optimum alloy of metal was used
over a charge of 2.5 drachms of black powder to
give 15% greater penetration at the target.
Thus a bore of .451, a charge of 70 grains of
black powder, and a projectile of 530 grains
weight became the optimum specifications to fit
the Board’s criteria. There remained only to fit
a lubricating wad (wax & tallow) between the
powder and projectile to soften the fouling so
that it could be blown out at the next
discharge. All of this was made available in
the existing kind of paper cartridge, encased in
a tear off cover with a tape tag. This
tear-off idea is still in use by tobacco
manufacturers in their cigarette packs.
Once again we will
quote from J.E. Tennett:
“The Whitworth
Rifle was first formally tried in competition
with the best Enfield muskets at Hythe in April
1857 in the presence of the Minister of War, and
a large assemblage of the most experienced
officers, including amongst others the Superintendent of
the Enfield factory, and General Hay, the chief
of the School of Musketry for the Army. The
success was surprising; in range and best figure
of merit obtained by any rifle at home or
abroad, was 27; that is to say the best shooting
had given an average of shots within a circle of
twenty seven inches radius at 500 yards
distance; but the Whitworth lodged an average of
shots within a mean radius of four inches and a
half from the same distance; thus obtaining a
figure of merit of 4.5. At 800 yards its
superiority was as 1 to 4, a proportion that it
maintained at 1,000 yards and upwards. At 1,400
yards the Enfield shot so wildly that records
ceased to be kept; and at 1,800 yards the trials
with it ceased altogether, whilst the Whitworth
continued to exhibit its accuracy as before.
“The chief of the
Government School of Musketry at Hythe, General
Hay, than whom from his official
responsibilities no authority could be more
impartial, when called on in 1860, by the
President of the Institute of Civil Engineers,
to state his opinion of the merits of the
Whitworth rifle, placed on record his judgment,
in the following words, extracted from the
printed proceedings:
‘As to the merits
of the Enfield and Whitworth rifles, that is a
matter upon which any man who has carefully
considered the subject is competent to come to a
conclusion. The small bore would of course, in
accurate shooting, beat the large bore. There
is a peculiarity about the Whitworth small bore
rifles, which no other similar arms have yet
exhibited; they not only give greater accuracy
of firing but triple power of penetration. For
special purposes any description of bullet can
be used in them from lead to steel. The
Whitworth rifle, with a bullet composed of one
tenth of tin, penetrated through 35 planks
whereas the Enfield rifle (with which a soft
bullet is necessary) only penetrated 12
planks.’”
Due to the greater
efficiency of the action of the Whitworth rifle
concern was felt as to the wear entailed on the
metals currently in use in small arms. Also the
longer paper cartridge would not stand up to
service conditions. Therefore only limited
issue to marksmen was recommended.
Into the scene now
intrudes the self-contained metallic cartridge
which put paid to the value of the ever hopeful
but ever leaky capping breech loaders. With the
quantity of pattern 1853 Enfield rifled muskets
on hand, the most pressing need was for an
economical way to convert them to breech
loading. This new trend overshadowed
Whitworth’s muzzle loading rifle concept. The
lessons learned concerning a smaller bore were
not forgotten, however, and were applied to the
next new breech loading rifle adopted, the
Martini Henry Rifle in 450 calibre.
Mr Whitworth was
elected a fellow of the Royal Society and the
degree of L.L.D. was conferred upon him by the
Senate of Trinity College Dublin. Not to be
outdone, a degree of D.L.C. was conferred on him
by the University of Oxford.
The Exposition
Universelle of Paris in 1867 saw a fine
collection of Whitworth’s engineering tools,
rifled ordnance and projectiles being allotted a
Grand Prix. The French Emperor, on witnessing a
trial of one of his field guns at Chalons,
conferred on him the Legion of Honour. On the
founding of the Whitworth Scholarships in 1869,
he was created a baronet for his assistance and
encouragement to young students of mechanical
and engineering science.
Sir Joseph
Whitworth stands high among the great engineers
and inventors of the 19th century
through his vigour, perseverance, and skill.
Many of his principles and practices remain
unchallenged in the 21st century.
Sir Joseph Whitworth died in January 1887 at the
age of 83, sorely missed.
It is now
pertinent to examine the life and activities of
Sir William George Armstrong. Born on the 26th
of November 1810 in the city of
Newcastle-on-Tyne and educated at a school in
Bishop Auckland (near Durham, Shropshire), he
grew up to choose the profession of solicitor,
joining the firm of Donkin, Stable and
Armstrong, from the years 1833 till 1847.
Having a side
interest in engineering, Armstrong was involved
in the design and building of a rotary water
motor in 1839, and he published several papers
during 1842 on the subject of` “The Electricity
of Effluent Steam”, this being a discourse on
static electricity. This resulted in his being
elected to the Royal Society of Engineers. The
Elswick Engineering Works was established in
1847 in the city of Newcastle-on-Tyne, with a
share capital of £22,500, to build hydraulic
cranes. By 1850 the company was building,
besides cranes, hoists, turntables, capstans and
dock gates. Attention soon turned to gun making
and the building of cannon barrels.
Reports from the
battle of Inkerman in the Crimean war of
1854-1856 highlighted inadequacies of the
artillery in use. Only the range and accuracy
of two eighteen pounder naval guns brought
ashore from the squadron at anchor were able to
silence Russian counter fire with greater
numbers of guns with superior range. Perhaps the
charge of the Light Brigade could have been
avoided. All of which made the point that field
artillery needed much greater range and accuracy
within their weight limitations
The Elswick
Ordnance Works was established in 1859 with
William Armstrong as supervisor (and in this
company he had no financial interest) to develop
the methods of producing superior cannon
barrels. The first gun built on the design of a
reinforced breech was loaded with an elongated
projectile of lead instead of a round ball and
other types. This was an experimental three
pounder, which being regarded as inadequate, was
bored up to a five pounder. As a result of the
experience gained, the War Department requested
another to be made as an eighteen pounder. This
exceeded the expectations of the Royal Artillery
Committee. A further twelve pounder and two
eighteen pounders were then produced for field
trials.
Field carriages
were also to receive Armstrong’s attention,
which resulted in the provision of an improved
elevating screw as well as a horizontal screw
which allowed a fine adjustment to the lay of
the barrel. Complementing these improvements, a
recoil slide was fitted on an inclined plane to
absorb recoil. After the discharge the slide
returned by the force of gravity to its original
position.
The Armstrong 32
pounder, using 5 pounds of black gunpowder,
would throw a projectile five miles with a mean
lateral deviation of 28 inches compared with 325
inches for a service gun. In simple terms the
Armstrong gun could hit a 30 inch target at
1,000 yards, while a service gun could only
occasionally hit a hay stack. The rifling of the
barrels was multi-grooved and in a spiral form
(like Sako micro grooves) going from 8 grooves
in a 3 pounder to 38 in a 9 pounder and 78 in a
100 pounder of 7 inch bore.
The main
departures from standard practice of barrel
making were firstly to produce an inner tube of
steel with longitudinal strength. Onto this
tube were shrunk circular wrought iron bands
made up by the forge welding of bars with a
fibrous quality twisted like threads in rope and
similar to the development of Damascus small
bore barrels. The idea was not originally
Armstrong’s, merely an application of an idea
claimed by Captain Blakeley, who quoted the
ideas of Longridge and Mallet. Another
application of this idea was used by the French
for the manufacture of tyres for railway
wheels.
The second
departure was into breech loading, again not an
original idea from Armstrong, as the Chinese
were known to use it, and every European nation
seems to have tried it at some time. Even
cannon on the Mary Rose, of Henry VIII’s
time, were breech loading, and over 10 patents
had been recorded in England in the previous
century. It was the development and application
of the idea to accommodate elongated projectiles
that was of importance. However, a projectile
of lead was found to be impractical, as it was
likely to suffer distortion in storage and
handling. Thus a compromise was reached by
using a bullet of iron coated in lead.
Advantages for the
system included:
1.
avoidance of accident from improper loading
procedure
2.
speed
of reloading especially in cramped naval
conditions;
3.
ease
of concealment in field situations;
4.
reduced exposure to enemy sharp shooters for the
gun team;
5.
increased ability to clean and service the
piece.
6.
facility for inspection of the bore.
Mr. Westley
Richards was to state, “The good qualities of
muzzle loading guns are also contained in breech
loading guns. Though the system was not perfect
in its construction, the advance was such that
it confers a great advantage to our forces.”
The design of the
Armstrong breech loading system was unique in
that it consisted of a powerful hollow screw as
a back up to a vertical sliding vent piece with
a mitred face to match a mitre at the rear of
the barrel. This screw, being hollow, allowed
the projectile and its wad to pass into the
breech ahead of the charge. The vent piece
containing the touchhole was intended to be
replaceable, as wear in the touchhole of solid
cannon needed to be plugged and rebored
regularly. Two vent pieces were supplied with
each cannon. The main engineering
objection to the system (as stated by Captain
Blakeley) was “ . . . as the vent piece is
primarily a valve, the principle of valves is
that pressure should render it tighter, whereas
in the Armstrong system it forces it looser with
resultant escape of some gas. The hollow screw
does not support the centre of the vent piece
and may swell and seize in the slot rendering
the gun unserviceable.”
With
the application of elongated shot, it was
desired to retain the properties of Shrapnel and
canister effects. This was accomplished with a
design of segmented shell, which was composed of
42 segment shaped pieces of cast iron, arranged
about a cylindrical cavity, the centre of which
contained the bursting charge and fuse. The
exterior was coated in lead by placing the shell
assembly in a mould and pouring in molten lead,
which percolated among the segments. The central
cavity was maintained by a removable steel
core. It had great strength in a forward impact
while having little resistance to a bursting
charge. This charge was inserted from the nose
and was confined by the time fuse screwed into
the apex. On a closed test of this design of
shell, 106 pieces of cast iron, 99 pieces of
lead, and 12 pieces of fuse were recovered.
In 1863 the
Elswick Ordnance Works was merged with the
Elswick Engineering Works and William Armstrong
resigned his position. The War Office became
disenchanted with breech loading, as wear on the
breech seal caused escaping gas, and this
happened all too rapidly on campaigns where
field replacement was not a viable option. So a
reversion was made to the muzzle loading system.
By 1880, developments in improved breech sealing
on the Continent and the advances of the Elswick
Works forced the War Office to re-examine their
decision. This was in light of the service of
the Elswick product as supplied to the Colonies
and the use of steel wire as reinforcing for the
breech.
William Armstrong
was raised to the peerage and became a lord in
1887. In the years from 1873 to 1897 he wrote
books and professional papers.
The Elswick
company was restructured in 1897 as Sir W.G.
Armstrong–Mitchell & Co. at this time with a
capital of £2,000,000 and continued the
manufacture of warships while the Mitchell yard
concentrated on mercantile construction and some
cruisers as needed. The year 1897 saw the
purchase of the Whitworth Works at Manchester to
make armour plate, capital now exceeding
£4,000,000. This year also saw the erection of
a new naval slipway at the Walker Yards for the
building of larger war ships.
Sir William
Armstrong passed away at the turn of the
millennium in 1900. After WWI, all armaments
factories experienced a slump and in 1927 the Elswick and Openshaw works were sold to a newly
established company, Vickers Armstrong Ltd.,
while the Sir W. G. Armstrong–Whitworth Ltd.
became Sir W.G. Armstrong & Co. with a capital
of £180,000. By 1929 the title had changed
again to Armstrong–Whitworth Securities Co.
Finally in 1937 the Admiralty secured the
Scottish Works and the company went into
liquidation.