It is the name of a prominent Christian saint, Saint Jerome, the translator of the Vulgate.Jerome ranked among the top 200 names given to boys born in the United States between 1903 and 1985. It has since declined in popularity and was ranked as the 616th most popular name for American boys born in 2008.t is the name of a prominent Christian saint, Saint Jerome, the translator of the Vulgate.
Expected Levels. Total hardness in freshwater is usually in the range of 15 to 375 mg/L as CaCO3. Calcium. hardness in freshwater is in the range of 10 to 250 mg/L, often double that of magnesium. hardness (5 to 125 mg/L). Typical seawater has calcium hardness of 1000 mg/L, magnesium.
More exactly and described in form of numbers is the determination of the crushing hardness also known as Vickers- , Rockwell or Brinell hardness. The hardness of a slate depends on the hardness, splitability and the amount of the different slate building minerals as well as from the fabric that means their spatial orientation to each other. Compared to other rocks like granite slate is suppose to be a relatively soft rock. For roofing slates the hardness is not so important. Yet, it is possible to distinguish the production hardness in respect to the mining, producing and finishing on the roof.