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The Life Raft That Works Either Way Up
A raft thrown from a sinking ship lands whichever way it falls. If it only works one way up, someone in cold water has to right it first.
Maria E. Beasley of Philadelphia filed on 17 January 1881 for improvements to the life-raft of her earlier US 226,264 (6 April 1880); US 258,191 is dated 16 May 1882. Flat, hollow metal floats with bevelled ends are hinged side by side so they fold flat for stowing and open into one plane; grated railings with rowlocks are hinged to swing up on either face; and air-tight provision compartments open from either side, so that "in the event of its being overturned in the water it can be instantly used without any delay in righting or adjusting it."
This rung works out how many people a set of floats will carry and builds a reversible model from bottles.
Intermediário
About 3 hours
Instruções
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1
Buoyancy and people
Buoyancy and people
A carregar o notebook Jupyter…
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2
What keeps it up
What keeps it up
Archimedes' principle sets how much a float can carry. The embedded blueprint measures displaced water.
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3
Read US 258,191
Read US 258,191
The object is "to improve the raft described and claimed in my Letters Patent of the United States numbered 226,264, and dated April 6, 1880, so that it may be more readily used." The improvements consist "in making the ends of the floats of the raft with a bevel upon both sides, attaching the railings by hinges so constructed as to be erected securely upon either surface, and in forming doors and stoppers for the water and provision compartments that may be opened upon either side", sometimes with a double railing, "so that in the event of its being overturned in the water it can be instantly used without any delay in righting or adjusting it."
The floats A are "flat rectangular metallic floats, having both sides of the ends beveled", joined by hinges B, some with chambers C and stoppers D for provisions. Bars E hook across to hold the floats in one flat plane. Hinges G "capable of turning in both directions" carry a grated railing H with an upper rail J and rowlocks K; hinged gates L at the ends complete the enclosure. Seats rest on the gratings, and a flag-staff stands in rings on one gate. Folded, railings and gates lie parallel with the floats.
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4
Build a reversible model
Build a reversible model
Tie four capped PET bottles side by side into two pairs, and join the pairs along their length with loops of paracord through holes in two strips of plywood, so the pairs fold flat on each other like Beasley's hinged floats. Fix a light dowel rail to each long side on small hinges so it can be swung up on either face.
Float it in a bath or pond, load it with weights until the bottles are awash, and compare with the notebook. Flip it over, swing the rails, and load it again: it should carry the same either way up.
Materiais para este passo:
Garrafa de PET (bebida gaseificada)4 peças
Paracord1 peça
Placa de contraplacado1 peça
Cavilhas de madeira dura1 peça
Dobradiça de livro4 peças
Parafuso para madeira16 peçasFerramentas necessárias:
Berbequim sem fios
Jogo de brocas
Balança digital de cozinha
Peso5
5
A model raft that misbehaves
A model raft that misbehaves
Model raft troubleshooting.
Flow
Loading...
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6
History and honest limits
History and honest limits
**Maria E. Beasley** of Philadelphia filed on 17 January 1881; US 258,191 is dated 16 May 1882 and improves her US 226,264 of 6 April 1880. She claims hollow metal floats hinged to fold, with bevelled ends that ride either way up, and railings hinged to stand above either face.
**Honest limits.** Float sizes, raft mass and the reserve in the notebook are examples; real life-saving equipment must meet maritime standards.
Materiais
6- Referência
- 1 peçaReferência
- 1 peçaReferência
- 1 peçaReferência
- 4 peçasReferência
- Parafuso para madeira10% de comissão16 peçasReferência
Ferramentas necessárias
4- 1 vendor sell this, none ship to you yetReferência
- Referência
- Referência
- Referência
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