Attachment_0001_Specifications_British_3-pounder.docx

Specifications for purchase of a 3-pounder iron cannon and carriage and including associated cannon equipment:

SPECIFICATIONS FOR REPRODUCTION 18th CENTURY IRON CANNON USED IN NATIONAL PARK SERVICE HISTORIC WEAPONS DEMONSTRATIONS

* Gun shall conform in all principal dimensions and weights as specified period manuals: AMERICAN ARTILLERIST’S COMPANION by Louis de Tousard or TREATISE OF ARTILLERY by John Muller or any other relevant source.

● Tube must be cast of cast ductile iron.

● Tube will be cast solid and bored. Core castings are not acceptable.

● Liner:

o ⅜ inch-thick D.O.M. (Drawn Over Mandrel) steel tubing for bore diameters less than 4 inches.

o ½ inch thick D.O.M. steel tubing for bore diameters greater than 4 inches

● Tube will not be cast with the liner in place.

● The bore of the liner will be of uniform diameter for its entire length.

● Internal breech of the steel sleeve must consist of an appropriate radius steel plug threaded into place and secured in sleeve with a deep fillet weld around the circumference exterior surface of the plug.

● Trunnion diameter not to exceed measurement of original design.

● Where appropriate the tube will have lathe turned external finish.

● Vent and vent piece: Where appropriate the tube will be vented with a brass or copper vent piece, as per the original guns. The vent will be on a vertical plane passing through the axis of the bore and makes an angle of 80 degrees with it. The vent enters the bore at a distance from the bottom equal to one fourth the diameter of the bore. The diameter of the vent will not exceed .2 inches.

● Barrel markings: The barrel manufacturer may place their company’s identification stamp ONLY on the underside of the barrel between the trunnions or on the left rim base. Any additional stampings are at the discretion of the purchasing park.

● Paint-minimum standards: one coat of metal primer and one coat of semi-gloss black, oil base enamel.

● Changes or substitutions: No changes or substitutions of materials or design shall be made without the written approval of the contracting officer after consultation with the park Historic Weapons Program Supervisor and a Regional Inspector

● Inspection and acceptance: The U.S. Government shall have the option of inspecting the gun at the contractor’s location or at the park site. The government shall have seven (7) days to perform the final inspection, if the gun is delivered to the site. The contractor agrees to perform the necessary changes or the purchase order shall be cancelled.

● Contractor’s Warranty: The contractor shall warrant all parts and labor for a period of two years from the date of acceptance of delivery. The contractor shall replace without cost to the U.S Government any part that fails due to manufacturing or material defect during the warranty period. All cost of transportation of the gun for the repaired covered by warranty will be at the expense of the contractor.

Carriage Specifications:

· carriage constructed to proper fit of 3-pounder gun tube, with no binding of trunnions against the trunnion plate or cap squares or tube against the cheeks of the carriage.

3-Pdr Revolutionary War Grasshopper Carriage (Laminated Carriage, Trail not to exceed 2 beams) All lumber to be #1 Kiln-dried White Oak or Ash. Wood to be treated with copper naphthenate, two coats boiled linseed oil,one coat bonding primer,one coat oil base enamel, and Two coats 100% acrylic enamel. All metal parts to be either ductile iron or steel, treated with two coats of rust prim All wooden parts of carriage to fit together evenly and cleanly, with no noticeable gaps.

Trunnion caps to fit over trunnions so that the plate runs parallel with the top of the carriage.

All metal parts fit snugly onto/into the wooden carriage.

· A quoin or similar elevating device to be provided with the carriage.

· The whole carriage to be painted to National Park Service specifications.

Ammo Chest for Grasshopper carriage that fits between the double brackets of the trails. This method is shown in the drawings of Colonel Pattison's three pounder gun.

Ammunition chest:

Interior is made of non-sparking materials Nails are countersunk and puttied over Lid fits snugly

Equipment to be provided/Specifications:

· Oak Sponge rammer staff, Sponge made of sheepskin. Synthetic sponge covers cannot be used.

· Iron worm or wad hook attached to oak shaft.

· Linstock

· Cartridge Former sized to bore of cannon tube.

· Tampion (Muzzle Plug) sized to bore of cannon tube.

· Leather apron (vent cover).

· Brass vent pick sized to vent hole of cannon tube.

· Vent punch sized to vent hole of cannon tube.

· Vent brush sized to vent hole of cannon tube.

· Sponge bucket

Specifications for cannon implements:

Sponge Rammer:

Sponge head fits securely to staff Sponge cover is oak-tanned sheep skin Tacks are copper/brass and are not protruding Rammer head fits securely to staff Staff is free of cracks or splintering Worm:

Worm head fits securely to staff Staff is free of cracks and splintering Linstock:

Linstock head fits securely to staff Staff is free of cracks and splintering