File:Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon (1908) (14779094791).jpg

Identifier: airshipspastpres00hild (find matches)
Title: Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon
Year: 1908 (1900s)
Authors: Hildebrandt, A. (Alfred), b. 1870 Story, W. H. tr
Subjects: Aeronautics
Publisher: New York, D. Van Nostrand company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
an inner coating ofrubber is required in order to protect the calico from its effects.The air-bag was increased to a size of 17,650 cubic feet, and dividedinto three parts; the fan was also arranged in a more convenientposition, and placed closer to the main body. The air-chamberswere so arranged in the first model as to be filled through a longneck which reached down to the car. This was found incon-venient, because at full speed the wind pressure was so great asto make it difficult to pass air into the neck. There was also thegreat danger wThich might arise if flames should break out in theneighbourhood of the motor, and be carried up by means of the 78 AIRSHIPS PAST AND PRESENT. neck. The fan was therefore driven by the motor; if themachine was at rest, an electric motor and a battery of accumu-lators were carried to supply the necessary power. Besides themain valve, there were also two safety valves, which allowed thegas to escape under a pressure of 1*4 in. of mercury. Two small
Text Appearing After Image:
Fig. 40, -Framework and car of Lebaudys dirigibleballoon. windows were provided for inspecting the inside of the balloon.Every possible precaution was taken to ensure the stability ofthe machine. A horizontal oval-shaped sail of blue silk, havingan area of 1,055 square feet, was stretched below the stand; andbeneath it there was a vertical sail, of much smaller dimensions,of the nature of a keel. At the back, which was ellipticallyshaped, surfaces having an area of about 240 square feet, and DIRIGIBLE BALLOONS FROM 1898 TO 1906. 79 shaped like the tail of a pigeon, were arranged round the mainbody, and were crossed at the middle by a small vertical sail.Instead of having only one rudder, the new model had two,which were smaller and placed further back. They were movableabout a horizontal axis, and of the shape of a V, with the pointedend towards the front. When at rest, it was in a state of stableequilibrium ; if one of the sails gave way before the wind, theother merely offered an in

Note About Images