JFKaboom-69, We sure are glad you liked our choice. We were beginning to wonder if everyone had turned into cannon builders and were just to frickin busy to comment.
Additionally i'd like to add that this is the best choice for a project yet. I have often drooled over the very picture you posted. That gun is an intimidating behemoth and I am sure that they made quite a boom when it was fired.
After finally collecting 36 images of Woolwich guns in every country of the British Empire, I kept coming back to the one that I just posted and also the one with a Tube and Carriage only at the South Gate of the Gibraltar complex which Fredstaple posted. I finally decided on the one you and I both liked, 'ole No.75, the number 2 gun in York Redoubt near Halifax, Nova Scotia, Canada. Too bad the British didn't have that gun centuries ago when the Norsemen arrived in their Dragon boats. The Englishmen could have blown the horns off the Norsemen's helmets at 50 yards and would have blown their bodies back over the beach to the boats from which they came. Talk about INTIMIDATION. HA!!
Right now I am working on another posting which will explain how some of the special equipment works on the gun Carriage and Chassis. I am using the picture below to use for illustration:
Brought up to the top for ease of reference is this pic of the RML 10 Inch 18 Ton Mark II Gun manned by the artillerymen in the Long School of Gunnery at Middlehead Battery in Fort Jackson near Sidney, NSW, Australia. When I finish detaching various illustrative portions of this great photo in about an hour, I will post them right here as informative additions to this posting. Tracy
In this segment of the larger photo you can see a handwheel which is attached to a worm which rotates a worm gear. A spur gear is on the same shaft as the worm gear and turns the mating spur gear on the nearest shaft to the rack. That spur mates with the gear teeth on the rack to drive it up for Tube depression and down for Tube elevation.
This segment of the main photo shows an artilleryman holding a brass vent punch with which to run down the vent and punch a hole in the powder cartridge so fire from the friction primer can communicate to the powder in the cartridge, firing the gun. What most of you don't know is that the artilleryman in question has the vent punch in approx. the correct spot to place it in the vent. You see, in these large seacoast and naval guns the vents were 45 degrees from vertical to the right or left of top dead center. In an ironclad with two 10 Inch guns side by side, the right hand gun would have a right side vent and the other a left side vent for obvious reasons. We are not aware of any other service which had large gun vents so placed.
We do not have a manual of operations for the 10 Inch RML Gun, but we believe this segment shows the artilleryman at the right rotating the eccentric axle so that the right front carriage wheel goes into its lower position where it rests on the rail and is held there by a cross pin not visible in the photo. After this has been done on both sides of the carriage, then four artillerymen can embar the rear eccentric axle in the two places to the right and the left of the right cheek and the same on the other side and pull backward using their weight to assist them. This lifts the rear of the carriage up and makes the front wheels bear weight also. After the axle locks are set, the carriage is ready to be pushed or lowered down the ramps into battery at the Chassis front.
This segment of the photo shows the equipment which assists the artillerymen in lowering the Carriage, now on four wheels, down the 4 degree slope to the front bumpers into battery. You can see that there is a block and tackle attached to the rear of the carriage and the inside rear of the Chassis with the rope's end going over a single pulley on the outside top edge of the Chassis and down to a small take-up drum attached to a shaft with a large gear which engages a small gear at the end of a bevel gear shaft which engages with another shaft with a mating bevel gear and has a large crank on the other end outside of the Chassis to facilitate artillerymen in cranking it. This way the carriage can be gently lowered down the ramp to the in-battery position.
Any questions? Ask away.