The cup experiment was tested for tone and found to be quite good. A padded stick tapped against the bottom yielded a distinct yet familiar latin sound. The percussive tone was in fact good enough to lead to the next experiment, via complex human thought patterns, "Hmm, how about a little bigger?" A balloon would have worked but a little 1/4‚" square hardware cloth was within ready reach.
The wire is not meant to add strength, it could have been wrapped in plastic and removed like the paper cup. The string at the bottom is a quick and easy way to pull across the oblong direction and make a more perfect circle.
Burlap applied outside and, the next morning, inside.
Twenty-four to thirty-six hours is required for the mixture to harden sufficiently to shape rough edges with a wood file, even-so, some filling and shaping can be done as a test anytime, if the file tears damp fibers instead instead of grinding a composite media, you'll know.
The ferrocement conga; le Ferrónga. The tone is okay, though not quite as good as the cup.
This drum traveled from North America to Europe and was used as an example of how the membrane for innovative structures made of bamboo supported space-age mud and wattle would feel. It should now travel from town to town with a drummer performing at concerts. Le Ferrónga is a little hard on the hands, being concrete, even so, it needs a vibrant drummer,** one who would occasionally pull it out and play a brief rhythm, a song explaining how everyone on the planet shares the human need for shelter equally, and, since little houses made like this are less than half the delivered cost of an emergency tent, per unit of area. Provision for the basic human need for shelter is readily available, it awaits a cultural decision in favor of justice and liberty for all. The next chapter advances from materials to consider figurative sculpture.
Continue to Chapter 9
** Percussionists, please apply online.