leading German aviation motor until late in 1918 when other motors
built on similar principles appeared and were found more adaptable to
the planes. Maybach, meanwhile, developed other types (Plate 20),
principally 160 and 260 horsepower units for heavier-than-air craft.

The following table illustrates the development in types and performance
of engines:

Performance of Engines--1892-1918

================================================================
| | | |Weight| Unit | Fuel |
| | |Revolutions| Kg. | Weight |Consumption |
Year | Motor | H. P.|per minute | |Kg./H. P.| Gr./hp-hr |
----------------------------------------------------------------|
1892 | Daimler | 11 | 440 | 500 | 45,5 | 500 |
1899 | Daimler | 15 | 680 | 385 | 25,7 | 400 |
1905 | Daimler | 90 | 1050 | 360 | 4,00 | ... |
1907 | Daimler | 100 | 1080 | 400 | 4,00 | 265-240 |
1909 | Daimler | 115 | 1100 | 420 | 3,65 | ... |
1910 | Daimler | 120 | 1100 | 450 | 3,75 | 225 |
1910 | Maybach | 145 | 1100 | 450 | 3,1 | 240 |
1913 | Maybach | 180 | 1200 | 462 | 2,56 | 225 |
1914 | Maybach | 210 | 1250 | 414 | 1,97 | 225 |
1915 | Maybach | 240 | 1400 | 365 | 1,52 | 200 |
1917 | Maybach | 260 | 1400 | 400 | 1,54 | 200 |
1918 | Maybach | 260 | 1400 | 390 | 1,50 | 200 |
----------------------------------------------------------------

The Employment and Training System

Apprentices and girls are given a thorough examination and test to
determine their fitness for the work, which requires the utmost
accuracy. Then they enter a twelve weeks probationary service. Their
apprenticeship lasts four years. All apprentices are given instruction
by engineers and foremen in physics, chemistry, knowledge of materials,
model making, foundry work, algebraic calculation methods, the handling
of graphics, curves, statistics, price calculation, machines and tools
and particularly the principles and functions of internal combustion
engines.

On January 1st, 1918, 1980 workmen were employed, 416 of them women.
There were 57 women on the executive and office staff of 217. On
November 1st, that year, 3300 workmen and 349 others were employed, 599
of them women.

[PLATE 35: "DELAG"-Zepp