Thus, in Coombs v. New Bedford Cordage Co., Justice Hoar
remarks that it cannot be doubted "that it is the legal right of
every person to carry on a business which is dangerous, either
in itself or in his manner of conducting it, if it is not unlawful,
and interferes with no right of other persons." (44) In such a case
if a person is injured, the jury cannot find that his employer is
negligent in not protecting employes from danger by guarding it,
though the evidence may show clearly enough that it would not
have happened had it been guarded, for the reason that the danger,
however great, if known, or might have been by ordinary observa-
tion, is assumed by an employe.
