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The Life Raft That Works Either Way Up
Emma

작성자

Emma

27. 9월 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.
중급
About 3 hours

안내

1

Buoyancy and people

Jupyter 노트북 불러오는 중…
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.

이 단계의 재료:

PET 병 (탄산음료)PET 병 (탄산음료)4 개
파라코드파라코드1 개
합판합판1 개
단단한 나무 목심단단한 나무 목심1 개
문 경첩문 경첩4 개
나사못나사못16 개

필요한 도구:

무선 드릴무선 드릴
드릴 비트 세트드릴 비트 세트
디지털 주방 저울디지털 주방 저울
추추
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.

재료

6
  • 플레이스홀더
  • 플레이스홀더
  • 1 개
    플레이스홀더
  • 플레이스홀더
  • 플레이스홀더
  • 나사못10% 수수료
    16 개
    플레이스홀더

필요 도구

4

CC0 퍼블릭 도메인

이 블루프린트는 CC0로 공개되었습니다. 어떤 목적으로든 자유롭게 복사, 수정, 배포 및 사용할 수 있습니다.

제품 구매를 통해 메이커를 지원하세요. 판매자가 설정한 메이커 커미션 을 받거나, 이 블루프린트의 새로운 반복을 만들어 연결로 포함시킬 수 있습니다.

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