LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
The Life Raft That Works Either Way Up
Emma

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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.
Miðlungs
About 3 hours

Leiðbeiningar

1

Buoyancy and people

Hleð Jupyter-vinnubók…
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.

Efni fyrir þetta skref:

PET-flaska (kolsýrður drykkur)PET-flaska (kolsýrður drykkur)4 stykki
Paracord-línaParacord-lína1 stykki
KrossviðarplataKrossviðarplata1 stykki
HarðviðartapparHarðviðartappar1 stykki
HurðarlömHurðarlöm4 stykki
TréskrúfurTréskrúfur16 stykki

Nauðsynleg verkfæri:

HleðsluborHleðslubor
BorasettBorasett
Stafræn eldhúsvogStafræn eldhúsvog
LóðLóð
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.

Efni

6

Nauðsynleg verkfæri

4

CC0 opinbert ríki

Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.

Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.

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