To investigate the transmission of loomvibration to the ground and to investigate thecharacteristics of the influence of vibration onhouses near a weaving mill, measurementswere made of an oscilating frequency of theground and of the vibration of the neighbourhouses, when many looms ran simultaneously.
The experimental results showed that :
(1) Number of proper vibration of a woodenhouse was 23Hz in horizontal direction. On asoft ground where it is easy to make resonanceof the low frequency of 23 Hz caused by abeating-up motion of looms, neighbour housesresonated at this low frequency, resulting in serious environmental problems.
(2) Therefore, in such area, there was noother way to prevent a large oscilatingmove-ment of looms than the construction methodto install many looms on the floating slabs.
(3) On the firm ground where it is difficultto make resonance of the low frequency, vib-ration frequency affecting neighbour houses wascomparatively high. The use of vibration-freedevices already developed was considered effec-tive to some extent.

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The previous reports showed that vegetable matters contained in a wool sliver could be eliminated by the hydrolysis method using dilute sulphuric acid, even if it did not undergo the process of baking and crushing.
As the following step of the study, an attempt has been made to carbonize a first gilling wool sliver by an industrial method carreid out in the system of backwashing machines.
As a result, it has been proved that most of the vegetable matters contained in a wool sliver is hydrolyzed into considerably fragile substances which can ultimately be crushed into powder when they go under the process of gilling and combing. This method makes it possible to remove approximately 95% of the impurities contained in raw materials when treated in a popular way used in most spin ning mills.
In addition, this method appears to have scarcely any unfavorable influence on fiber properties, i.e., fiber length, tensile strength, alkali-solubility, dyeability and colour-fastness of wool.

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