PROCEEDINGS OF THE POLYTECHNIC ASSOCIATION. 463 



pistol, and breech-loading carbine; each launch having- a twelve-pounder 

 rifled cannon, to protect the crossing of troops, or in laying a pontoon 

 bridge, as at Fredericksburg, where such service had to be performed by- 

 infantry, with pontoon boats. The cost of preparation for five regiments 

 with sixty guns would not be greater than the cost of ten batteries of field 

 artillery with the same number of guns, and the ''dale of the roads" would 

 not render their arrival at an appointed place at anajjpointed time uncertain. 



The proper equipment of marine artillery for a regiment with twelve 

 guns is: 



Two light-draught steamboats, with supplies. 



Twelve launches, 8 feet wide, 30 feet long. 



Twelve boat howitzers. . 



Twelve sliding carriages. 



Twelve limbers. 



Thirty horses and harness. 



One hundred and twenty ammunition boxes, with partitions for 10 rounds 

 for the smooth bore howitzer, and 12 rounds for the rifle. 



Seventy-two spars, five feet long, three inches in diameter, for carrying 

 guns. 



Two hundred straps for do. 



Twelve awnings for launches. 



Twelve lines, 200 fathoms in length, with spring hook at one end. 



Twelve sets of oars, boat hooks, and poles, for launches. 



Twelve boxes spare articles. 



Twelve sets of gun implements. 



Twenty-four pivot bolts for sliding carriages. 



Twenty-four grapnels, Avith 30 fathoms of line to each. 



Twelve pairs of skids for landing guns. 



Twenty-four tow lines for copper tanks, when overboard the launches. 



Twelve balls of strong twine. 



Four canvas slings to put horses overboard. 



Twenty-four corn sacks. 



Twelve wooden buoys. 



Twelve paulins. 



Six hundred boarding pikes, staves eight feet long*. 



THE STEAMBOATS, AND EQUIPMENT FOR ONE BOAT. 



Six launches. 



Two anchors, 600 pounds each, 60 fathoms chain. 



One large kitchen range, and the usual cooking utensils for four hundred 

 men. 



One set of cabin furniture for officers' cabin. 



Sixteen sets of state-room furniture, and bedding for three berths in each. 



Two ship's compasses for pilot-houses. 



One glass. 



Six copper magazine tanks for small arm ammunition. 



One portable forge for machine shop. 



One anvil for machine shop. 



One bench vice for machine shop. 



