Remember that the surface must be perfectly cleaned before the heavy oil is applied.
Of heavy oil engines there are some dozens of well-tried types.
Some have dark-red flesh, which usually contains a heavy oil which becomes acrid when stale.
The light oil contains the most hydride of benzoyl, and the heavy oil the most benzoin.
The next fraction is the “heavy oil” or “creosote oil,” of specific gravity 1.04.
This liquor will filter off in the same manner, and thus be separated from the heavy oil.
Each had forty tons of heavy oil for surface propulsion and charging the dynamo which supplied the electric engines under water.
The receiver is changed, and the "heavy oil" comes over; towards the end a thick brown or yellow viscid product is got.
The best method for lubricating grooved bullets is to mix beeswax and cylinder or other heavy oil,—one part oil to four beeswax.
In that year a patent was taken out by Bethell for preserving timber by impregnating it with the heavy oil from coal-tar.