Environmental Engineering Reference
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production during the period 1905-1934 can be followed. It
culminated from 1909 until 1915, when around one windmill
per week was delivered, but in 1920, the yearly production had
declined to less than 10 windmills.
Figure 3.14
The annual number of windmills during the period 1905-1934
from the producer D. M. Heide reflects the development of
the wind power market. Heide maintained production through
the 1920s and 1930s, but at a reduced level (Data from
copies of Heide's notebooks in the Danish Wind Historical
Collection, DVS).
During the following years, Heide and other producers found a
new market ofering a technical upgrade for the traditional Dutch
windmills, which were in close competition with industrial flour
and grain producers using steam power and electricity. The cap,
the original four blades and part of the wood-based transmission
were removed. Instead an iron tower with a 5- or 6-bladed rotor
was mounted at the top of the mill house, giving more wind
power and higher production capacity.
Another survival strategy was used by the Lykkegaard Machine
Factory of Funen. The founder, Niels Hansen, was one of the two
winners in Poul la Cour's contest for practical construction of
the “ideal windmill” in 1901. The name of the family farm
“Lykkegaard” was adopted both for the firm and for the next
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