A Board of Appeals consisting of five members
and three associate members shall be appointed as provided in MGL
c. 40A, § 12, as amended, which shall act on all matters
within its jurisdiction under this bylaw in the manner prescribed
in said section and subject always to the rule that it shall give
due consideration to promoting the public health, safety, convenience
and welfare, encouraging the most appropriate use of land, and conserving
property values, that it shall permit no building or use injurious,
noxious, offensive or detrimental to a neighborhood, and that it shall
prescribe appropriate conditions and safeguards in each case.