History
The history of volumetric mixing comes from several directions;
- The mobile auger mixer was invented in 1964 by Harold Zimmerman, Ephrata, PA USA. His design allowed all of the ingredients (sand, stone, water, and cement) necessary to produce the concrete to be stored in separate bins and compartments directly on the batching unit.
- The drum for trailer mounted volumetric mixer was designed in 1979, by Fred Caron and Neal Surry, Sacramento, California USA. They mimicked the larger transit-mix truck's mixing drum, on a smaller scale and loaded the drum from a batching unit that metered the volume.
- The paddle mixers exact history is unrecorded, but these volumetric mixers have been in use by masons for at least 50-years. Usually these produce smaller batches.
Read more about this topic: Volumetric Concrete Mixer
Famous quotes containing the word history:
“The history of the Victorian Age will never be written: we know too much about it.”
—Lytton Strachey (1880–1932)
“What has history to do with me? Mine is the first and only world! I want to report how I find the world. What others have told me about the world is a very small and incidental part of my experience. I have to judge the world, to measure things.”
—Ludwig Wittgenstein (1889–1951)
“To summarize the contentions of this paper then. Firstly, the phrase ‘the meaning of a word’ is a spurious phrase. Secondly and consequently, a re-examination is needed of phrases like the two which I discuss, ‘being a part of the meaning of’ and ‘having the same meaning.’ On these matters, dogmatists require prodding: although history indeed suggests that it may sometimes be better to let sleeping dogmatists lie.”
—J.L. (John Langshaw)