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

APPENDIX

1. SELECTED DATA FOR MINING MEN.

To find lost part of a vein--Calculation of ore reserves--Hydraulics--Boring--Durability of ropes--Diamond drilling--Notes on timber--Laying out areas--Mensuration--Mine surveying problems--Rainfall--Belting notes--Weight and bulk of materials--Chemical elements and their symbols, &c.--Common names of chemical substances--Thermometer readings--Freezing, fusing, and boiling points--Heat values of fuels--Signs and symbols used in expressing formulas--Weights and measures--To find contents of a tank--Sizes and weights of corrugated iron sheets--Thickness and weight of sheet iron--Qualities of ropes--Atmosphere--Fresh and salt water--Velocity of falling fluids--Pressure of water--Table of squares and cubes, and their roots--Wages and interest tables. pp. 167-193

2. AUSTRALASIAN MINING REGULATIONS pp. 194-201

INDEX pp. 203-206

GETTING GOLD