M I (re-built 1912), & M II (re-built 1912). Military. [Illustration] ~Length,~ 242-3/4 feet} ~maximum diameter,~ 36 feet (11 m.) ~capacity~, 212,000 c. feet (6,050 kg.) ~total lift~, 13,338 lbs. (6,000 m cubed) _about_ 6 tons ~Useful lift.~--2,756 lbs. (1,250 kgs.)=about 1-1/4 tons. ~Gas bag.~--Continental rubber cloth, diagonal thread. Tapering shape. ~Ballonet.~--One-fifth of total volume. ~Motors.~--2-75 h.p. Daimler. 2 propellers, with 3 aluminium blades. ~Speed.~--About 28 m.p.h. (45 km.). _Remarks.--M I_ was originally built in 1908, re-built and enlarged 1910 and again in 1912. _M II_ built 1909, re-constructed 1912. [Illustration] M III (re-built 1912). Military. [Illustration] ~Length~, 295-1/4 feet (90 m.) ~diameter~, 39-1/3 feet (12 m.) ~volume~, 317,800 c. feet (9,000 m cubed.) ~Motors.~--4 Koerting of 75 h.p. each = 300 h.p. total. ~Speed.~--19 metres per second = 42 m.p.h. (68-1/2 k.p.h.) ~Propellers.~--2, on outriggers from car, chain-driven. Remarks.--Built 1910. Burned 13th September, 1911. Rebuilt 1912. M IV (re-built 1913). Military. +---------------------+ | | +---------------------+ ~Maximum length~, 334-3/4 feet (102 m.) ~maximum diameter~, 44-1/2 feet (13.5 m.) ~volume~, 423,800 c. feet (12,000 m cubed.) ~Total lift.~-- lbs. ( kgs.) ~Useful lift~, lbs. ( kgs.) ~Gas bags.~--Continental. ~Motors.~--2 Koerting, 100 h.p. each = total 200 h.p. ~Speed.~--44-1/2 m.p.h. (70-1/2 k.p.h.) ~Propellers.~--4 (two for each motor.) Carried on outriggers projecting from the car. Remarks.--Departs from previous practice in having two separate cars, each of which contains one motor. Originally built in 1911 of 7,500 m cubed. Re-built 1912-1913 to details as above. =PARSEVAL CLASS (Non-rigid).= Luftfahrzeug-Gesellschaft m.b.H, Berlin, W. 62. When the "Motorluftschiff Studien Gesellschaft" was formed at the instigation of the German Emperor, a committee was formed to acquire an experimental airship of the most promising type. Major Von Parseval's first airship was selected, and since that time the above company has confined itself to improving this type, and to making exhaustive and costly researches, all of which have been embodied in successive ships. The characteristic feature of every one of these craft is its unequalled portability. Almost all other so-called Non-rigid vessels distribute the load by means of a long girder which also serves as a car. This girder is awkward to pack up and transport. Parseval uses a comparatively small car, and distributes the weight by hanging it further below the balloon than usual, and also by using 2 ballonets which are placed one near each end of the gas bag. These 2 ballonets enable the ship to be trimmed by merely pumping air into either at the expense of the other.