afe launching or landing of the Zeppelins. Then there were to be
airplane factories on the same airdrome. It was at the Staaken plant
that the L-59 was fabricated for the record flight to German East Africa
and return. In all, twelve Zeppelins were built there.

The Duralumin Works

During the war two plants were put up in the vicinity of Friedrichshafen
for making duralumin materials such as angle bars, strips, all kinds of
girders, and other parts of the Zeppelin skeleton. They were operated
for the most part with female labor.

[PLATE 33: The "DELAG" Passenger Zeppelin "Hansa", 1912.

The "DELAG" Passenger Zeppelin "Sachsen", 1913.]

The Woodworking Factory

A woodworking factory (Holzindustrie G.M.B.H.-Meckenbeuren) also was
established near Friedrichshafen for the manufacture of propellers, etc.
It has recently been enlarged and is operating at full capacity
producing materials for buildings, dwellings, etc. During the war the
specially designed Zeppelin propellers were made at Goeppingen.

The Maybach Motor Works

One of the accessory companies founded by Zeppelin in 1909 was the
Maybach Motor Factory (Maybach-Motorenbau) (Plate 18), at
Friedrichshafen. It was enlarged considerably during the war, supplying
practically all the airship motors used. Today the Maybach works include
three large three story factory buildings, parts of which are devoted to
executive offices, two workshops of recent origin occupying two acres,
many engine testing stands, laboratory, and a power plant fully equipped
with the latest machinery. The entire plant is under the management of
Mr. Maybach, inventor of the only motor designed for airships alone. One
reason for the peculiar efficiency of the plant is the special workman's
training department which has received considerable attention from the
executives.

[PLATE 34: "DELAG"-Zeppelin Harbor at Frankfort a.M., 1912.

"DELAG"-Zeppelin Harbor at Baden-Baden, 1910.]

The first Maybach motors were produced in 1912 (Plate 19), and were 140
and 180 horsepower. They contributed largely to the success of the
commercial Zeppelin before the war. In 1915 a 240 horsepower motor was
built, and this was the principal motor used on the military and naval
Zeppelins. Maybach produced an entirely new motor in 1917. It supplied
from 260 to 320 horsepower and is noted as the first supercompression
motor. Quickly recognized as the best engine for airplanes, it became
the