The following Official Report was hand-copied by Assistant
Engineer Ezra Jabez Whitaker of the USS LACKAWANNA and is
graciously provided by his granddaughter, Sara Whitaker Hale.
United States Steam Sloop “Richmond”
Inside of Mobile Bay, August 13th 1864
Rear Admiral D. G. Farragut
Commanding W.G.B. Squadron
US. Flag Ship Hartford
Sir: In obedience to your order of the 6th inst. hereunto
appended, we have the honor respectfully to report that we have made a strict and careful survey of the iron clad casemated steamer “Tennessee”, captured from the rebels in the engagement in the bay, on the morning of the 5th inst. by the fleet under your command, and submit as follows, namely:
Description of Tennessee’s Hull
The hull of the vessel appears to be exceedingly strongly built in every part. the materials being oak and yellow pine, with iron fastenings. Length from Stem to Stern on deck, two hundred and nine (209) feet. Greatest breadth of beam on deck, forty eight (48) feet. Mean average draft of water about fourteen feet. The
deck is covered fore and aft with wrought iron plates two (2) inches thick. The sides of the vessel are protected by an overhang, sponsoned and covered with two layers of two (2) inch wrought-iron.
This overhang extends about six feet below the water line. The sides of the vessel below the deck are beleived to be eight (8) feet thick and the distance from the knuckle, or outside of the overhang on deck,to the base of the casemate on either side, is ten (10) feet.
The vessel is provided with a strong beak or prow, which projects about two (2) feet under water, formed by the continuation of the sponsoning and covered with wrought-iorn plates.
Casemate
The casemate of the vessel is very strongly built, It is seventy eight (78) feet eight (8) inches long, and twenty eight (28) feet nine (9) ins wide inside, the sides of the vessel extending ten (10) feet from it on either side at the greatest bredth of beam
The framing consists of heavy yellow pine beams, thirteen (13) inches thick, and placed close together vertically, outside planking of yellow pine, five and a half (5 1/2) inches thick, laid on horizontally, and outside of this horizontal planking, therethere is a layer of oak timber four inches thick, bolted on vertically, upon which the iron plating is secured.
The plating or armor of the casemate forward is six (6) inches thick, consisting of three two (2) inch iron plates, of about six (6) inches wide each, and abaft, and on the sides five (5) inches thick, consisting of two (2) two (2) inch and one (1) one (1) inch iron plates of the same width.
The yellow pine framing of the casemate is planked over inside with two and a half (2 1/2) inch oak timber laid on diagonally.
The whole of the armor plating is fastened with through bolts, one and a quarter (1 1/4) inch diameter, with washers and nuts inside
The casemate is covered on top with wrought-iron gratings, composed of bars two (2) inches thick and six (6) inches wide, laid flat, and supported on wooden beams twelve (12) inches square, and about five (5) feet distant from each other. Some of these gratings are ringed and fitted to open from the inside.
There are ten (10) gun ports in the casemate, two (2) in the broadside, on either side, three (3) forward and three (3) aft.
The forward and after ports, to port and starboard, are placed so as to enable the forward and after pivot guns to be used as broadside guns. The directly forward and after ports are on a line with the Keel.
The ports are elongated and made just wide enough for the entrance of the muzzle of the guns in training, and only high enough to allow a moderate elevation and depression of the gun.
The wooden backing is cut away on each side of the ports inside of the casemate, to allow the guns to be trained about one point forward and aft. The gun ports are covered with wrought iron sliding plates or shutters five (5) inches thick; those for the four broadside guns are fitted in slides, The sliding plates or shutters for the pivot guns are pivoted on the edge, with one bolt
that can be knocked out, detaching the shutter, if necessary, and are worked by a combination of racks and pinions.
Armament
The armament of the Tennessee consists of six (6) rifled guns, called by the rebels Brook’s rifles.
The two (2) pivot guns are 7 1/8 inch bore, and the four (4) broadside guns are 6 inch bore. These guns are reinforced abaft by two wrought-iron bands two (2) inches thick, respectively, weight of projectiles ninty-five (95) pounds and one hundred ten (110) pounds solid shot.
The pivot guns are fitted on wooden slides, with a rack let into them, On an arm attached to the carriage there is a pinion for running out the gun, and by raising the arm the rack is thrown out of gear to allow the gun to recoil.
The arrangements for working the battery, and the
impliments and machinery employed appear to be very good.
Quarters for Officers and Crew
The cabin is large and comfortable for an iron-clad vessel,
The ward-room is situated directly over the engine, and is open to it, and although sufficiently commodius, we are of the opinion that it would be impossible for officers or others to preserve their health or to live there comfortably for any considerable length of time, in the absence of a better and more perfect ventilation than is at present provided.
The quarters of the crew are excellent, and exceedingly comfortable for an iron-clad vessel of her description. These quarters consist of a roomy berth deck, with rooms fitted up on
either side for the junior officers.
The berth deck communicates with the casemate by means of a large hatch, and is provided with two large ventilators through the deck, outside of the casemate.
When in port, and in moderately smooth sea: it is believed that the berth deck will be found to be sufficiently well ventilated to ensure a reasonable degree of comfort to the crew: but when the ventilators are unshipped, it is believed that the one blower now on hand (and which is also used for forcing the fires) is not sufficient to produce a proper circulation of fresh
air.
The steering arrangements appear to be very defective, and the accommodations for the pilot and helmsman bad. These defects can, however, be easily remedied and at a small cost.
Machinery
The Machenery of the vessel consists of two geared non-condensing engines. Cylinders twenty-four (24) inches diameter and seven (7) feet stroke, with poppet-valves arranged as is the usual mode on
board of western river steamers
These engines were taken out of the river steamer called the “Alonzo Child.” They are placed fore and aft in the vessel, geared to an idler shaft by spur gearing with wooden teeth, and
from the idler shaft to the propeller shaft by bevel cast-iron gear.
Boilers
There are four horizontal flue-boilers, twenty four (24) feet long, placed side by side, with one furnace under the whole of them; the products of combustion returning through the flues are delivered into one smoke pipe. The engine and fire rooms are insufferably hot and very badly ventilated.
Injuries received in the action.
The injuries to the casemate of the Tennessee from shot are very considerable. On its after side nearly all the plating is started; one bolt driven in; several nuts knocked off inside; gun-carriage of the after pivot gun damaged, and the steering rod or chain cut near that gun. There are unmistakable marks on the after part of
the casemate of not less than nine (9) eleven (11) inch solid shot having struck within the space of a few square feet in the immediate vicinity of that port. On the port side of the casemate
the armor is also badly damaged from shot. On that side, nearly amidships of the casemate, and between the two broadside guns, a fifteen (15) inch solid shot knocked a hole through the armor and backing, leaving on the inside an undetached mass of oak and pine splinters, about three (3) by four (4) feet, and projecting inside of the casemate about two (2) feet from the side. This is the only shot that penetrated the wooden backing of the casemate, although there are numerous places on the inside, giving evidence of the effect of the shot.
There are visible between forty and fifty indentations and marks of shot on the hull, deck, and casemate, varing from very severe to slight; nine of the deepest indentations on the after part of the casemate, (evidently being eleven (11) inch shot) and the marks of about thirty of other calibres on different parts of
the vessel.
There are also a few other marks, being, however, merely scratches or slight indentations of the plate.
The smoke-stack was shot away, although it is not
improbable the heavy ramming by the Monongahela, Lackawanna and Hartford, had previously prepared it for its fall.
Three of the wrought-iron port shutters or slides were so much damaged by shot as to prevent the firing of the guns.
There are no external visible marks or evidences of injury inflicted upon the hull of the Tennessee by the severe ramming by the Monongahela, Lackawanna and Hartford; but inasmuch as the decks leak badly, and when there is a moderate sea running in the bay, her reported usual leakage of three inches an hour being now increased to five or six inches an hour, it is fairly to be
inferred that the increased leakage is caused by the concussion of
the vessels.
The Tennessee is in a state to do good service now.
To restore her to the state of efficiency in which she was when she went into the action with this fleet on the fifth instant, it will be necessary to overhaul much of the iron plating on the port and after sides of the casemate, and replace some of it.
The iron gun-port slides or shutters, which were damaged, must be either removed or repaired.
A new smoke stack is required, and additional ventilators should be fitted.
Blowers are required to produce proper ventilation in the engine-room and on the berth deck.
When these small repairs and additions shall have beem made, the iron-clad Tennessee will be a most formidable vessel for harbor and river service, and for operating generally in smooth
water, both offensively and defensively.
The original of this report is accompanied by sectional views of the Tennessee and a sketch showing the effect of shot on the outside.
We are, very respectfully, your obedient servants,
(signed) Thornton A. Jenkins, Captain
(signed) James Alden, Captain
(signed) William E Leroy, Commander
(signed) T. Williamson, Chief Engineer