Date:

Author: Bernard Cleyet

Subject: Re: Bed of Nails -- RE: High speed video

Post:


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Bill A.!

You confirmed my point.

In reply: How many high school students or frosh U. students have
been construction apprentices or DIYers? i.e. "... worked with
them ..."

> convincing noise.

Right; so they don't know it has low shear strength.

Remember the problem two posters had w/ a "real" cement block?

BTW, most steels at RT aren't brittle.


bc thinks the demo is fake, i.e. no nails and friable block(s).

p.s. fence post concrete is also not immediately hydrated, which
also results in lessened strength


On 2009, Aug 31, , at 14:36, Bill.Alexander@humboldt.edu wrote:

> Because a cardboard box doesn't shatter with a convincing noise. I
> see nothing invalid about using a "green" cinderblock, anyone who
> has worked with them knows they are not particularly strong and if
> dropped will sometimes break. Nowhere do we say it is a nearly
> unbreakable block. If you want that, get a steel box fabricated. It
> is sort of like breaking a board with your hand when you hit it
> with the grain.
>
> Bill A.
>
> ----- Original Message -----
> From: "Bernard Cleyet"
> To: tap-l@lists.ncsu.edu
> Sent: Monday, August 31, 2009 1:58:11 PM GMT -08:00 US/Canada Pacific
> Subject: Re: [tap-l] Bed of Nails -- RE: High speed video
>
> This calls into question the validity of the demonstration. Why not
> use a cardboard box painted to look like a cement block?
>
> bc


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Bill = A.!

You confirmed my point. =


In reply: How many high school students = or frosh U. students have
been construction apprentices or DIYers? = i.e. "... worked with them
= ..."

convincing = noise.


Right; so they don't know = it has low shear strength.

Remember the problem = two posters had w/ a "real" cement block? =

BTW, most steels at RT aren't = brittle.


bc thinks the = demo is fake, i.e. no nails and friable = block(s).

p.s. fence post concrete is = also not immediately hydrated, which also
results in lessened = strength


On 2009, Aug 31, , at = 14:36, Bill.Alexander@humboldt.edu wrote:

Because a cardboard box doesn't shatter with a = convincing noise. I
see nothing invalid about using a "green" = cinderblock, anyone who
has worked with them knows they are not = particularly strong and if
dropped will sometimes break. Nowhere do we = say it is a nearly
unbreakable block. If you want that, get a steel box = fabricated.
It is sort of like breaking a board with your hand when you = hit it
with the grain.

Bill A.
=

----- Original Message -----
From: = "Bernard Cleyet" To: tap-l@lists.ncsu.edu
=
Sent: Monday, August 31, 2009 1:58:11 PM GMT -08:00 US/Canada = Pacific
Subject: Re: [tap-l] Bed of Nails -- RE: High speed = video

This calls into question the validity = of the demonstration. Why not
use a cardboard = box painted to look like a cement block?

=
bc


=

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