XVII. On metallic titanium

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The Effect of Compressibility on the Pressure Reading of a Prandtl Pitot Tube at Subsonic Flow Velocity

Errors arising from yawed flow were also determined up to 20 degrees angle of attack. In axial flow, the Prandtl pitot tube begins at w/a approx. = 0.8 to give an incorrect static pressure reading, while it records the tank pressure correctly, as anticipated, up to sonic velocity. Owing to the compressibility of the air, the Prandtl pitot tube manifests compression shocks when the air speed approaches velocity of sound. This affects the pressure reading of the instrument. Because of the increasing importance of high speed in aviation, this compressibility effect is investigated in detail

Phototesting and photoprotection in LE

Photosensitivity and induction of skin lesions following UV radiation is a common problem of patients with cutaneous and systemic forms of lupus erythematosus. The detrimental effect of UV radiation to patients with lupus erythematosus was already recognized in the last century. Skin lesions can now be provoked under standardized conditions allowing the diagnosis and classification of patients with photosensitive disorders. The aim of this review is to give an overview on the history, test procedure and test results in patients with lupus erythematosus

NACA Technical Memorandums

One of the problems of modern cavitation research is the experimental determination of the wing loads on airfoils during cavitation. Such experiments were made on various airfoils with the support of the naval ministry at the Kaiser Wilhelm Institute for Flow Research at Goettingen

NACA Technical Memorandums

Errors arising from yawed flow were also determined up to 20 degrees angle of attack. In axial flow, the Prandtl pitot tube begins at w/a approx. = 0.8 to give an incorrect static pressure reading, while it records the tank pressure correctly, as anticipated, up to sonic velocity. Owing to the compressibility of the air, the Prandtl pitot tube manifests compression shocks when the air speed approaches velocity of sound. This affects the pressure reading of the instrument. Because of the increasing importance of high speed in aviation, this compressibility effect is investigated in detail

Kleine Romane und Erzaehlungen / [C. Walchner]

KLEINE ROMANE UND ERZAEHLUNGEN / [C. WALCHNER] Kleine Romane und Erzaehlungen / [C. Walchner] (1) Einband (1) Titelseite (3) Frontispiz (4) Titelseite / Titelvignette (5) Faust in London, eine Erzählung ... (7) Ibrahim. (47) Pradock oder Tugend auf der Probe. (94) Anekdote. (129) Frater Franz. Eine Geschichte aus dem Tagebuch eines Längstverstorbenen. (138) Noch eine Geistergeschichte. (163) Die Wirthstochter. Ein Beytrag zur Geschichte des menschlichen Elends. (181) Spaziergänge am Bodensee. Aus der Handschrift eines reisenden Britten. (194) Kastel. (195) Reichenau. (210) Kapitel (233) Illustration (234) Ursula von Rheinach. Gebohrne von Homburg. Romanze. (235) Rache an Untreu. Eine Romanze aus dem Mittelalter. (242) Die Erweiterung der Burg Nellenburg. (255

Systematische Geschossmessungen im Windkanal

Wind-tunnel measurements on projectiles are discussed. Tests at the Gottingen Tunnel are described. The tunnel operates on the Prandtl principle, that is, a brief stationary air stream produced in an evacuated tank by induction of atmospheric air