Chapter XII: Rules of Thumb

(MINING APPLIANCES AND METHODS)

A temporary forge--Making charcoal--Rough smelting on the
mine--Misfires in blasting--To prevent loss of rich
specimens in blasting--Simple retorting of small quantities
of amalgam--Simple mode of ascertaining nominal H.-P. of
engine--Scaling copper plates--How to supply mercury and
water to mortar-boxes--Power for mills--To avoid loss in
cleaning up--Iron extractor--To silver copper plates--How to
make a dolly, rough windlass, puddler--A makeshift
pump--Squeezing amalgam--Sluice plates--Measuring inaccessible
distances--To set out a right angle with tape--Simple levelling
instruments--Levelling by aneroid barometer--To determine
heights--To find depth of shaft--Plan for re-using
water--Cooling compound for heated bearing--Cleaning greasy
plummer blocks--An excellent anti-friction compound--To
clean brass--A solvent for rust--To protect iron and steel
from rust--To keep machinery from rusting--Fire-lute--
Rope-splicing pp. 140-166