Furnace, 927; Air Columns, 927; Inclined Air Columns, 928; Calcula
tion of Ventilating Pressure in Furnace Ventilation, 928; Calcula
tion of Motive Column or Air Column, 928; Influence of Furnac
Stack, 929; Mechanical Ventilators, 929; Fan Ventilation, 929; Dis
Fans, 929; Centrifugal Fans, 930; Exhaust Fans, 930; Force Fan
and Blowers, 930; Vacuum System of Ventilation, 930; Plenun
System, 930; Comparison of Vacuum and Plenum, 930; Types o
Centrifugal Fans, 931; Nasmyth, 931; Biram's Ventilator, 931
Waddle, 932; Schiele, 932; Guibal, 932; Murphy, 933; Capell, 933
Sirocco Fan, 933; Direct-Connected Engines, 934; Other Drives
934; Method of Determining Fan Diameter, 934; To Ascertain Far
Speed Required, 934; Horsepower Needed, 934; Size of Motor, 934
Evase Stack, 934; Maximum Inlet Velocity, 935; Loss at Inlets, 935
Standard Air, 935; Inlet Velocities, 935; Special Fans, 935; Equiva
lent Orifice, 935; Murgue's Formula, 936; Sullivan Reversible Fans
936; Sullivan Fans, Sizes, Weights, Dimensions, Table, 937; Fan
Ratings, Tables, 938-940; Table of Capacities, 941; Position of Any
Fan, Etc., 941; Manometrical Efficiency, 942; Mechanical Efficiency,
942; Fan Construction, 942; Size of Central Orifice, 942; Diameter of
Fan, 942; Curvature of Blades, 943; Tapered Blades, 943; Number
of Blades, 943; Spiral Casing, 944; Evase Chimney, 944; High-
Speed and Low-Speed Motors, 944; Fan Tests, 944; Conducting Air
Currents, 944; Doors, 944; Stoppings, 945; Air Bridges, 945; Air
Brattice, 945; Curtains, 944.
Crushing Machinery.-Object, 949; Cracking Rolls, 949; Corrugated
Rolls, 950; Disintegrating Rolls and Pulverizers, 950; Hammers, 950;
Miscellaneous Forms of Crushers, 951; Sizing and Classifying
Apparatus, 951; Stationary Screens, Grizzlies, Head-Bars, or Plat-
form Bars, 951; Shaking Screens, 952; Size of Mesh, Table, 952;
Revolving Screens, or Trommels, 952; Speed, 953; Duty of Anthracite
Screens, 953; Revolving Screen Mesh for Anthracite, 953; Hydraulic
Classifiers, 953; Jeffrey-Robinson Coal Washer, 953; Scaife Trough
Washer, 954; Jigs, 954; Stationary Screen Jigs, 954; Heberle Gate,
955; Theory of Jigging, 955; Equal Settling Particles, 955; Table of
Equal Settling Factors or Multipliers, 956; Interstitial Currents, or
Law of Settling Under Hindered Settling Conditions, 956; Interstitial
Factors, 957; Acceleration, 957; Suction, 957; Removal of Sulphur
From Coal, 957; Preparation of Anthracite, 958; Preparation of
Bituminous Coal, 959; Sizes, 959; Method, 960; Screening Area, 961;
Shaker Screens for Small Sizes, 961; Screen Feeders, 962; Tipple
Design, 962; Washing Bituminous Coal, 962.
Handling of Material.-Anthracite Coal, 962; Weights and Capacities of
Standard Steel Buckets, Table, 963; Elevating Capacities of Malle-
able Iron Buckets, Table, 963; Conveying Capacities of Flights at 100
Ft. per Min., Table, 963; Horsepower for Bucket Elevators, Table,
964; Pitch at Which Anthracite Coal Will Run, Table, 964; Horse-
powers for Coal Conveyors, Table, 965; Horizontal Pressure Exerted
by Bituminous Coal Against Vertical Retaining Walls, Table, 965;
By Anthracite, Table, 966; Cost of Unloading Coal, 966; Briqueting,
967; Machines, 967; Briqueting of Fuel, 967; Of Flue Dust, 968;
Cubic Feet Occupied by 2,000 Pounds of Various Coals, Table, 968.
Rules for First-Aid Corps.-969; Shock, 970; Burns and Scalds, 970; Heat
Prostration, 970; Convulsions, 970; Artificial Respiration, Shafer
Method, 970; Sylvester Method, 971; Treatment for Electrical
Shock, 972; Rescue From Electrical Contact, 972; Fractures, 973;
Drowning, 973.
Method of Moving Injured Persons.-973.
Safety First.-Systematic Timbering, 975; Adequate Supervision, 975;
Premium System and Company Rules, 976; Safeguarding Machinery,
978; Protecting from Electricity, 980; Failure of Machine Parts, 980;
Preventing Mismanipulation of Controlling Devices, 980; Safety
Practices of the H. C. Frick Coke Co., 982.
Mine-Rescue Work. Organization, 984; First Steps, 984; Reversing the
Air Current, 985; Work of Recovery, 985.
Mine-Rescue Apparatus.-Breathing Apparatus, 986; Self Rescuer, 987;
Resuscitation Apparatus, 987.
NATURAL SINES, COSINES, TANGENTS, AND COTANGENTS
Explanation of Tables.-989.
Tables of Natural Sines and Cosines.-991-999.
Tables of Natural Tangents and Cotangents.-1000-1008.
The Coal Miners' Pocketbook
Immediately following each table of weights or of measures is given a table of equivalents showing the relation existing between the different denominations. All figures on the same horizontal line are of equal or equivalent value. The United States unit of length, of which unit all other denominations are multiples or submultiples, is the yard, originally derived from the Imperial yard of Great Britain. Since 1893, the United States Bureau of Standards has been authorized to derive the yard from the meter, using the relationship established by Congress in the act of July 28, 1866, viz., 1 yard:
12 inches (in.).
3 feet..
5.5 yards.
The rod of 16.5 ft.,
in surveyor's measure.
and variously known as the perch or pole, is the same as The furlong is now no longer used.
The land league of 3 statute mi. is 15,840 ft.; the nautical, or marine, league of 3 geographical mi. is 18,240 ft.
The nautical, marine, or geographical mile is the
part of 1° of a great circle of a sphere whose surface is equal to the surface of the earth. This is commonly taken as 6,080 ft., but is more accurately 6,080.26 ft., and is equivalent to 1.1516 stat. mi. One statute mile equals .8684 naut. mi. The fathom of 6 ft. is used at sea in measuring depths of water, and some
times (England) in giving depths of mine shafts.
The pace is commonly 3 ft. The U. S. military pace is 30 in.
SURVEYOR'S LINEAR MEASURE
The surveyor's linear measure is no longer in common use but its denominations are found in descriptions of the boundaries of farms taken from old deeds. Lengths of land lines are now measured and recorded in feet and decimal parts thereof.
Surveyors commonly use the engineer's chain of 50 or 100 ft., the feet b divided into tenths and hundredths.
The annexed scale shows on one side, proportionately reduced, a scal tenths. On the other, a scale of twelfths, corresponding to inches. reduce inches to decimal parts of a foot, find the number of inches and f tional parts thereof on the side marked "inches." Opposite, on the scal
tenths, will be found the decimal part of a foot. Thus, if it is wanted to fi the decimal part of a foot represented by 7 in., find the mark correspondi to 7 in. on the side marked "inches." Opposite this mark may be re 6 tenths, 2 hundredths, and 5 thousandths; or, expressed decimally, .6 This scale may be laid out, full size, upon stiff cardboard and will be found ve useful in figuring lengths in construction work.
DECIMALS OF AN INCH AND MILLIMETERS FOR EACH 1-64TH I
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