There are several forms of filters, they may be in the form of sheets or " candles ", or they may be a fine powder such as diatomaceous earth, also called kieselguhr.
12.
Dusts have been used to ward off insects from grain storage for centuries, including " plant ash, lime, dolomite, certain types of soil, and diatomaceous earth ( DE ) or Kieselguhr ".
13.
Swedish chemist and inventor Alfred Nobel found that when nitroglycerin was incorporated in an absorbent inert substance like " kieselguhr " ( diatomaceous earth ) it became safer and more convenient to handle, and this mixture he patented in 1867 as dynamite.
14.
Some methods involve filtration media such as sheets or candles, while others use a fine powder made of, for example, diatomaceous earth, also called kieselguhr, which is introduced into the beer and recirculated past screens to form a filtration bed.
15.
Liquid nitroglycerin was widely banned elsewhere as well, and this finally led to Alfred Nobel & Company's development of dynamite in 1867, made by mixing the nitroglycerin with the diatomaceous earth ( " kieselguhr " ) found in the Kr�mmel hills.
16.
Since the advent of silicification, diatoms have made a significant impression on the fossil record, with major deposits of fossil diatoms found as far back as the early Cretaceous, and some rocks ( diatomaceous earth, diatomite, kieselguhr ) being composed almost entirely of them.
17.
"Brisance " by lead block compression ( Hess crusher test ) is 30.0 mm, versus 18.5 mm for NG and 16 mm for TNT . Brisance by sand test, determined in mixtures with 40 % kieselguhr, gave for NGc mixtures slightly higher results then with those containing NG.
