Thanks for the information on mine warfare. Has I said given some time defensive mines would be laid. Civil War experience showed them how to do it quickly, and more sophisticated systems would follow. Sweeping mines within rifle range of a hostile shore is a hazardous operation. Your can't sweep mines north of the Verrazano Narrows, and Battleships aren't going to anchor in the Lower New York Bay. See what happened at Gallipoli. Shore based torpedoes would also be used. No British Army is going to land on Staten Island, like in 1776.Splendid. So how do you stop the Royal Navy sweeping the mines with smaller vessels, which they've been doing since the Crimean War, without coastal artillery to shell those smaller vessels? Moreover, how long does it take to build the extensive infrastructure necessary to actually control the mines - and how long would said infrastructure last without coastal artillery to stop the larger British ships shelling it from a safe distance?
'Self-acting mines. — Used for closing channels not needed for our own use. Such mines are dangerous alike to friends and foes... Mines of this class find only a limited application in our system...'Mines under control. — By the aid of electricity it is easy to bar a channel against any enemy by a system of automatic mines which can be made inoperative, and hence absolutely safe for our own vessels, at the will of the operator. This is accomplished by placing a mechanism in the mine which at the blow of a vessel shall, as desired, open or close an electrical circuit in the mine.... and is extended to the shore by an armored cable, like those used in deep-sea telegraphy. At low-water mark the cable enters a horizontal gallery, leading to a vertical shaft, which opens in a secure casemate, where is stationed the operator with his apparatus. This apparatus consists of a powerful firing battery, which will ignite the fuze if allowed to send a current through it; a signal battery too feeble to endanger the fuze, but strong enough to operate an electro magnet in the casemate when flowing through the fuze and mine; some form of relay capable of automatically regulating the flow of these batteries through the circuit ; and, lastly, of various galvanometers and other apparatus for testing the condition of the mines and cables, and a telegraph connecting with an exterior observation station. In such a system everything depends upon the will of the operator... It requires no argument to prove that 4 or 5 miles of channel thus obstructed will be no small obstacle to an advance, and if at the same time it be swept by a heavy fire of modern artillery, and be covered by movable fish torpedoes operated and controlled from the shore, the city in rear will be safe from insult, and the fleet in front will be free to operate in the most effective manner — secure in the possession of a haven of refuge should the fate of battle prove adverse.'REQUIREMENTS.'To make such a system of mines effective, four things must receive careful attention before the outbreak of war: (1) A supply of mines and their accessories must be in store; (2) the galleries, shafts, and operating casemates must lie constructed and ready for use ; (3) a sufficient number of instructed men must be available to plant and operate the mines; and (4) the flanking guns, machine guns, electric lights, and other appliances for defending the mines must be properly mounted in secure land defenses ready for action. Our actual condition in respect to these requirements will now be considered.'(1.) As to the supply of mines in store, the small appropriations granted by Congress have been expended in purchasing such parts of the system as are most difficult to procure and slowest to manufacture. At the depot at Willets Point are stored enough electrical apparatus to supply about forty casemates (five are required in New York Harbor alone), and enough torpedo cable to meet immediate demands. At New York, Boston, Philadelphia, and San Francisco a few mines without anchors or wire cables or other appliances are. in store; but at no other points on our whole coast has any preparation been made... It is not enough to equip our chief harbors; because a proper number of mines, operated even from the old forts, would protect harbors of minor importance, together with the vessels which had sought a refuge in them... An annual appropriation not less than $100,000 for ten years, for submarine mines, may safely be recommended by the Hoard.'(2.) Galleries, shafts, and casemates for operating mines involve little expense. Almost nothing has been done, although funds have been urgently requested for several years. An appropriation of $500,000 would go far to equip our whole Atlantic and Gulf coasts, and half that sum would meet the urgent needs of the Pacific coast.'(3.) An instructed corps of submarine miners is absolutely essential... Until last autumn only about 130 men were under instructions at Willets Point; now the number is increased to about 375. At present this is probably sufficient ; but when moie material is in store the whole strength of the battalion authorized by law, 752 men, should be kept under training. The service is highly technical, and failure would be certain if officers and men without experience should suddenly be called upon to defend the coasts with mines.'(4.) Flanking guns, machine guns, electric lights, etc., should not be neglected. These auxiliaries have in general received but little attention in this country. The old smooth-bore 10 inch and 8 inch guns in the existing casemated batteries (if themselves defended by modern ordnance properly mounted in modern defenses) would be of great service. No provision for machine guns or electric lights has been made except experimentally.'
The 12pdr 6cwt of 1892 is a different gun, but used only by the Royal Horse Artillery. The 15pdr BL of 1895 is literally the 12pdr 7cwt of 1885, with a different shell in it.
THE EARL OF DENBIGH asked the Secretary of State for War what progress had been made in the re-arming of batteries of horse and field artillery... their Lordships would remember that the horse and field artillery batteries were not long ago armed with the 12-pounder breechloading gun. It was an excellent gun, found to be too heavy for horse artillery and not heavy enough for field artillery; and it was decided to convert the old 12-pounder into a 15-pounder for the field artillery, not by altering the size of the gun but by giving a longer and heavier shell, while the horse artillery were to be armed with the new 12-pounder gun... At the present time he understood that they were going to practise with the old 12-pounder ammunition for the purpose of using it up...THE SECRETARY OF STATE FOR WAR (The Marquess of LANSDOWNE). The rearmament to which the noble Earl's question refers is that which was mentioned in the explanatory Memorandum laid upon the Table with the Army Estimates for this year. It was explained in that Memorandum that two operations were in progress—first the rearmament of the Horse Artillery with the new 12-pounder gun; and secondly, the conversion of the whole of the guns of the Field Artillery from 12-pounders to 15-pounders... It was decided, as I have already said, to adopt a heavier shell for the 12-pounder gun. The shell first issued, and which weighed 14½ lb., was found to be slightly too heavy. This shell, which is known as "Mark I." shell, was given up after a very small number only had been manufactured, and a lighter shell, weighing very little over 14 lb., known as "Mark II." shell, was adopted in its place. The whole of the Field Artillery will have this shell, and we are now turning them out at the rate of between 3,000 and 4,000 a week. No Field Artillery guns have been sighted for "Mark I." shell, and no sights have been or will be issued for that shell. These guns all retain their old 12-pounder sights, and they will also be sighted for the 15-pounder "Mark II." shell. I can explain why, for the present at all events, it has been thought desirable to retain the old as well as the new sighting. It is intended that the whole of the Field Batteries should practise this year with the 12-pounder shell. This decision has been come to, first, because we have a considerable quantity of that shell in stock and do not desire to waste it, especially as it is held that instruction gained with it at gun practice is, for general purposes, equal to that gained from the new ammunition; and, secondly, because it is not thought desirable that we should begin using the new shell until we have accumulated an adequate supply of it to complete our ammunition columns.
Here's the manual for the 15pdr 7cwt Mark 1. Page 7 describes the sights: 'The bars are triangular in section, and are graduated on the left face in the case of converted sights with a yard scale graduated for 5,100 yards, reading to 25 yards (for use with the charge and projectiles of the 15-pr BL gun)… the rear face with a yard scale for use with the charge and projectiles of the 12-pr BL 7cwt gun. New sights, Mark III, for guns on Mark I carriages, and Mark IV, for guns on Mark II carriages, differ from the converted sights described above in not being graduated for the 12-pr charge and projectile'. The reason that some 15pdrs are fitted with converted sights featuring a scale graduated for the charge and projectiles of the 12pdr 7cwt is because, as we keep telling you, it's the same gun.
Perhaps because the problems weren't actually that bad. We are, after all, talking about a gun whose two flaws were:
The latter was fixed with a new carriage, although for most of the world it wasn't a problem. The former was fixed by giving the horse artillery a slightly lighter gun. However, as we do keep telling you, the gun itself was not taken out of service.
- it was slightly too heavy for horse artillery, with a total behind-the-team weight of 37cwt. However, as its replacement weighed 33cwt, the 13pdr RML which had preceded it weighed 43cwt, and the 9pdr RML which preceded the 13pdr had weighed 35cwt, we aren't exactly dealing with large numbers here.
- the axle traverse mechanism, which allowed the crew to aim the gun a little way to the left or right without having to move the whole carriage, could seize up in the phenomenally dusty conditions of India. Notice that this was observed in the cavalry manoeuvres of 1891, which one would expect to create far more dust than comparable infantry manoeuvres in India or cavalry manoeuvres almost anywhere else in the world.
Interesting that the maximum range for the 12pdr BL is given as 5,000 yards, because the range table for the 12pdr BL shows a range of 6,000 yards at 15 degrees 30 minutes on the Mark I carriage (p.27), and 15 degrees 24 minutes on the Mark II carriage (p.28). Even if you take Wikipedia as accurate, the Ordnance rifle weighs 5% more to fire a 25% smaller shell 20% less distance - at maximum range, not at the actual achievable distance by a professional artillery crew versus a part-time state militia one. And then you compare bursting charges for the US 3.2in M1885 with the 12pdr 7cwt BL to realise that the British shell contains more than three times as much explosive as the most modern US field gun, and things start to get really interesting...
Thanks for the article about the BL 12 pounder cwt 7. So if you send a gun back to the factory, to be rebuilt to a new design, with new carriages, sights, ammo, and limbers it's not the same gun, it just has the same barrel. That's why it had a new model designation, when it was used in the 2nd Boer War. At any rate it's not the same gun being used in 1890. India isn't the only place on earth were a marching army kicks up a lot of dust. In the age of dirt roads you could see armies moving by the dust clouds hovering over them. Wagons, guns, limbers, caissons, horses, and thousands of marching men kick up choking dust, unless it's raining, which creates other problems.
It would be rare for these guns to be firing at their max ranges, except in bombarding fixed locations. Guns of the era were mostly used in direct fire roles. There not used like howitzers in the 20th Century. The earth isn't a table top, direct fire at thousands of yards isn't possible in most places. North American isn't the Russian Steppe, or the North African Desert. British doctrine was to push their guns up into rifle range, to support the infantry in the attack. They thought they were following Prussian doctrine, but they misunderstood what they were doing. When they did that in South Africa it didn't work out well, and it wouldn't in the first few battles with the Americans ether.
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