• To obtain good heating efficiency, this ratio is usually 3:1 when the work is to be heated all the way through and 10:1 when it is to be surface hardened.
НАСКВОЗЬ
Русско-английский перевод НАСКВОЗЬ
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012