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The book is on the use of crochet to make physical surfaces with the geometry of the hyperbolic plane. The full hyperbolic plane cannot be embedded smoothly into three-dimensional space, but pieces of it can. Past researchers had made models of these surfaces out of paper, but Taimiņa's work is the first work to do so using textile arts. [1]
The PC-8801 was a Japanese home computer released by NEC in 1981 - and original PC-8801 games (as opposed to titles from later revisions of the platform) started to be made available through Project EGG on November 24, 2001. There have been 184 original PC-8801 titles available on Project EGG, 25 of which are no longer available for purchase:
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A 'collapsing compass' would appear to be a less powerful instrument. However, by the compass equivalence theorem in Proposition 2 of Book 1 of Euclid's Elements, no power is lost by using a collapsing compass. Although the proposition is correct, its proofs have a long and checkered history. [1]
Data from Jane's All the World's Aircraft 1988–89 General characteristics Crew: one Length: 13 ft 9 in (4.19 m) Wingspan: 16 ft 8 in (5.08 m) Height: 4 ft 6 in (1.37 m) Wing area: 86.0 sq ft (7.99 m 2) Empty weight: 475 lb (215 kg) Gross weight: 850 lb (386 kg) Fuel capacity: 12 US gal (10.0 imp gal; 45 L) Powerplant: 1 × Continental A-80 Horizontally opposed piston, 80 hp (60 kW ...
[1] Ruppelt was the director of Project Grudge in 1949 and then Project Blue Book in March 1952; he remained with Blue Book until late 1953. UFO researcher Jerome Clark writes, "Most observers of Blue Book agree that the Ruppelt years comprised the project's golden age, when investigations were most capably directed and conducted. Ruppelt was ...
MakerPlane is an open source aviation organization, started by a group of Canadian plane building enthusiasts. Its members are designing the first open source airplane, [1] which they estimate could cost about US$15,000 to build. [2] [3] Many do-it-yourself aircraft projects are abandoned before they are completed. [4]
The PDQ Aircraft Products PDQ-2 is a very basic light aircraft originally built in 1973 in the United States, and marketed as plans for a homebuilt aircraft. [1] It was a minimalist design, consisting of aluminum alloy tubes carrying the pilot's seat, a set of monoplane wings and a T-tail.