*Read Carefully:* Place your name and full address at the head of the paper. Any cheap, light paper like the sample previously sent you may be used. Do not crowd your work, but arrange it neatly and legibly. _Do not copy the answers from the Instruction Paper; use your own words, so that we may be sure you understand the subject._ 1. What essential features of design did Meusnier’s first dirigible incorporate? 2. Describe the difference between rigid, semi-rigid, and flexible types of dirigibles. 3. State the laws governing the increase of resistance with speed, the increase of power necessary for a given increase of speed, and the ratio in which the volume and area of the gas bag increase with increased dimensions. 4. What provides the lifting power of the dirigible and how is this lifting power utilized? Why should this lifting power be so much less at night than in the daytime? What is net lifting power? 5. What are air balloonets? How and for what purpose are they used? 6. What is the most efficient form of envelope for the dirigible, and why? 7. Why cannot the ordinary spherical balloon be propelled as a dirigible? 8. Is the form of the stern as important as the bow? 9. What is longitudinal stability and how is it obtained? 10. How is stability of direction obtained? What are stabilizing planes? 11. Why must a form of suspension for the car that cannot be accidentally displaced with relation to the balloon be provided? 12. Theoretically, where should the propulsive effort be applied to a dirigible? What factors affect the placing of the propeller and what has been proved to be the most practical solution of the problem? 13. Discuss the advantages of the kite balloon over the aeroplane for observation. 14. What is the effect of the wind on a modern kite balloon? 15. What is the difference between "pounds per horsepower" and "pounds per horsepower hour" as applied to the motor of a dirigible? Which is more important? 10. Sketch and explain the Astra-Torres suspension. 17. What differences exist between a Zeppelin and a Schutte-Lanz dirigible? 18. Describe the "L-49", discussing power plant and control. 19. Define static and dynamic equilibrium as applied to the dirigible. 20. Is the Zeppelin effective? Discuss fully. *After completing the work, add and sign the following statement:* I hereby certify that the above work is entirely my own. (Signed)