1913 Del. Laws 439, § 18.

No child under the age of fifteen years shall be employed, permitted or suffered to work . . . in or about establishments wherein nitroglycerine, dynamite, dualin, guncotton, gunpowder or other high or dangerous explosives are manufactured, compounded or stored; unless said establishment are insured under the approval of the board of insurance underwriters of the district where said establishment is situated.