INDEX TO TECHNOLOGY, 

[The numbers refer to the top paging of the text.] 
ADIT-LEVELS, methods of working, 115-121. 
Agriculture, general observations on, 139; de- 
scription of the principal soils and the methods 
of tillage appropriate to them, 139-141 ; agri- 
cultural tools, 141-143 ; grain crops, 143-145 ; 
root and fruit crops, 145 ; under-ground drains, 
145, 146 ; double crops, 146, 147; flax, 147; 
cider, ib. ; live stock, 148-155. 
Anemometer, the, an instrument to ascertain the 
velocity of the air-currents in mines, 127.. 
Angers, the slate-quarries near, 113, 114. 
Aqueducts, various early, enumerated, 54; de- 
seription of the Croton aqueduct, 54-56. 
Arkwright’s can-roving frame, 83. 
Atmospheric railroads, 34 ; construction of the 
Kingstown and Dalkey line, 35, 36. . 
Batting or beating machines, for cotton, 77. 
Bees, the rearing of, 153-155. 
Blasting, the, of rocks with gunpowder, 111-113. 
Bleaching, the, of cotton goods, 99. 
Blowing machines, for cotton, 77. 
Bobbin-and-fly frame, the, 83. 
Boring, the process of, and apparatus used in, 
108-110. 
Boulton’s stamping-mill for coins, 104. 
Braithwaite’s steam fire-engine, 67, 68. 
Brakes, for railway carriages, 31. 
Bramah’s fire-engine, 66, 67. 
Brunel, I., the engineer of the Thames tunnel, 9. 
Bridges, the, of the ancients, 36, 37; general 
principles respecting the position and construc- 
tion of, 37 ; details of the construction of stone 
bridges, 37-40—of wooden, 40—42—of iron, 
42-44 ; suspension, 4446; canal bridges, 
a6, 57. 
Buckets, form and position of, for water-wheels, 
70. 
Buffers, the, of railway carriages, 26, 30. 
Butter, methods of making, 150. 
Caissons, 39. 
Canals, high antiquity of, 48; method of making, 
48,49 ; description of the Canal of Languedoc, 
49-51 ; the construction of locks, 51-54 ; aque- 
ducts, 54-56 ; bridges, 56, 57. 
Carding machines, 78-81. 
Carrousel bridge, the, at Paris, 44. 
Cars, railroad, 28-31. 
Causeways, 3. 
Cesse aqueduct, the, 54. 
Chirk aqueduct, the, on the Ellesmere canal, 54. 
Cider, the manufacture of, 147. 
Coal region, the, of Neweastle, 107; of Ron- 
champ, ib. 
Coffer-dams, the construction of, 38. 
Coining, 101 ; the melting process, 101, 102 ; the 
rolling-mill, 102, 103 ; the cutting out, 103 ; 
milling, 103, 104; stamping, 104, 105. 
Coins, variable alloy in, 101. 
Colebrookdale, iron bridge over the Severn near, 
43. 
Cotton, the manufacture of, 74; ginning of, 74, 
75; picking, scutching, lapping, and carding 
machines, 75-81 ; the drawing-frame, 81-83 ; 
the roving-frame, 83-87; completion of the 
rovings, 57-89 ; the mule and mule-spinning, 
89-96; the singing or gassing of yarn, 96; 
weaving, 96-99 ; finishing and bleaching, 99, 
100. 
Coupling-bars or chains for railway carriages, 31. 
Cranes, description of various, 57-59. 
Crossings, railroad, 16, 22. 
Croton aqueduct, the, description of, 54-56. 
Culverts, 7, 15, 17. 
Dairy, the produce of the, 150, 151. 
Dams, various methods of constructing, 47, 48 ; 
in mines, 122-124. 
Danforth’s tube roving-frame, 83, 84 ; throstle- 
frame, 88. 
Danube, the, suspension bridge over, at Pesth, 
45, 46. 
Darby, Abraham, bridge over the Severn con- 
structed by, 43. 
Davy’s safety-lamp, 128. 
Dee, aqueduct over the, 54. 
Dogs, used in hunting, 156. 
Drainage, the, of mines, 129, 130; of the soil, 
145, 146. 
Drains, 15. 
Drawing-frame, operation of the, and changes 
wrought by, in the fibre of cotton, 81-83. 
Drifts, the, of mines, 115-121. 
Earth-borer, the, or auger, 108. 
Ellesmere canal, aqueduct on the, 54. 
Ellet, Charles, suspension bridges erected by, 46. 
Embankments, the construction of, 14; materials 
for, 15, 48, 49. 
Faleonry, 156, 157. , 
Fire-engines, description of several different kinds 
of, 64-68 ; other means and apparatus for the 
preservation of persons and property in case of 
fire, 68, 69. 
Fishing, fresh water and marine, 162, 163. 
Flax, the preparation of, 147. 
Fruit, the drying of, 145. 
Furnaces, description of the different kinds of, 
used in metallurgie operations, 132-136, 138. 
Gauge, the broad and narrow, 21. 
Ginning, the, of cotton, 74, 75. 
Gold, method of extracting from auriferous sand, 
136, 137. 
Gradients, railroad, 13. 
Grain, machines for cleaning, 73, 74; the thresh- 
ing of, 144; double crops, 146, 147. 
| Grinding mills, 72-74. 
ICONOGRAPHIC ENCYCLOPZDIA.—VOL. IV. 
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