The rigging is referred to as "Tackle", cited in the following letter from R.D. Minor.

September 20, 1861.
MY DEAR SIR: Brooke and I have read your letter with suggestions for the armament of the Merrimack, and as you say heavy guns are to be mounted, but not one of X-inch but rather of IX-inch, the heaviest to be cast of this caliber, say 14,000 pounds. Buchanan will probably be her captain, and I hope you will be her first lieutenant. I am overwhelmed with duty, some of it, too, not mine, and as rifled guns and projectiles are all the go, I am kept hard at work preparing them for service. A steamer from England has come into Savannah with powder (thank God!), blankets, and munitions of war. North, who is in England, had a hand in it, I believe. I hope this supply will not make the people in power here relax their efforts to make a supply for ourselves. I am glad to say that our prospects for a plenty of this munition are improving, and on yesterday I had the pleasure of obtaining a quantity of saltpeter and sulphur for a mill at Raleigh. Good news, is it not? and I confess that my breath comes easier now than it did when our prospects were so blue. Officers are being sent off to New Orleans for defenses there, and it seems to be the opinion now that Fernandina will soon be attacked.
I send eight tackles for Whittle at Spratley's farm, which please have forwarded to him. How shall I send other and heavier things to him? I did not mean to rifle an old 32, but to ask the charge for a new gun of 33 hundredweight just made. How much? Three and a half pounds?
Excuse haste. Very truly, yours, R. D. MINOR.