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<p>[QUOTE=&quot;wlwhittier, post: 9751644, member: 76316&quot;][USER=54]@springfld.arsenal[/USER]</p><p><br /></p><p>As nearly as I can measure; 10&quot; within ~1/8&quot;.</p><p>A 10&quot; sphere has a volume of ~524 cubic inches.</p><p>Cast Iron weighs ~0.254 lb/cu. in.</p><p>Sphere <i>should</i> weigh ~133 lbs if <i>solid.</i></p><p>Sphere actual weight: ~61 lbs 6 oz.</p><p>So this sphere only weighs a little less than half (0.4615) what it would <i>if it were solid.</i></p><p>That tells me the hollow is a sphere with a volume of ~282.2 cu in., which matches closely with the phantom weight of ~71.2 lbs.</p><p><br /></p><p>The sphere is featureless, save for the surface rust an&#039; pitting. There are no obvious ports or plugs (I&#039;ve looked it over carefully) that would allow powder or shrapnel to be admitted into the hollow.</p><p>I&#039;ve had it stored in an outside room at my son&#039;s place, but he took one look at it an&#039; insisted it be removed, as he considers it may be filled with powder or other explosive material. So it&#039;s on my deck.</p><p><br /></p><p>All of this is preamble to my question: Is this a cannonball?</p><p>If not...what in the world do I have?</p><p>Then there&#039;s the problem of how an iron sphere is cast with a hollow core?</p><p>I know I&#039;m missing something important here...but hope y&#039;all will chime in an&#039; relieve my puzzlement. Thanks for lookin&#039;!</p><p><br /></p><p>[ATTACH=full]478654[/ATTACH] [ATTACH=full]478655[/ATTACH] [ATTACH=full]478656[/ATTACH][/QUOTE]</p><p><br /></p>

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