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The Life Raft That Works Either Way Up
Emma

Erstellt von

Emma

27. September 2026SE
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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.
Fortgeschritten
About 3 hours

Anweisungen

1

Buoyancy and people

Jupyter-Notebook wird geladen …
2

What keeps it up

Archimedes' principle sets how much a float can carry. The embedded blueprint measures displaced water.
3

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.
4

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.

Materialien für diesen Schritt:

PET-Flasche (Kohlensäuregetränk)PET-Flasche (Kohlensäuregetränk)4 Stück
ParacordParacord1 Stück
SperrholzplatteSperrholzplatte1 Stück
HartholzdübelHartholzdübel1 Stück
ScharnierScharnier4 Stück
HolzschraubenHolzschrauben16 Stück

Benötigte Werkzeuge:

AkkubohrschrauberAkkubohrschrauber
BohrersatzBohrersatz
Digitale KüchenwaageDigitale Küchenwaage
GewichtGewicht
5

A model raft that misbehaves

Model raft troubleshooting.

Flow

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6

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.

Materialien

6

Benötigte Werkzeuge

4

CC0 Gemeinfrei

Dieser Blueprint ist unter CC0 veröffentlicht. Sie dürfen dieses Werk für jeden Zweck frei kopieren, ändern, verbreiten und verwenden, ohne um Erlaubnis zu fragen.

Unterstützen Sie den Maker, indem Sie Produkte über seinen Blueprint kaufen, wo er eine Maker-Provision von Anbietern festgelegt, verdient. Oder erstellen Sie eine neue Iteration dieses Blueprints und verbinden Sie ihn in Ihrem eigenen Blueprint, um Einnahmen zu teilen.

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