Part 148

=Will= people all be bald sometime? 144 the sky ever fall down? 255

=Windows=, how an explosion breaks them, 62

=Wireless=, accidents, prevention of, 449 aerial on R. R. stations (illus.), 451 aerial on ship (illus.), 455 antennæ, 447 antennæ on trains (illus.), 450 battery, 447 coil, 447 compass, 454 development of, 454 direction finder, 454 distance of sending, 448 equipment, 446 first Marconi station, 452 how it reaches ships at sea, 446 icebergs (illus.), 449 in the army (illus.), 447-448 inventor of, 452 key, 447 masts, height of, 448 G. Marconi, portrait, 452 on trains (illus.), 450 prevents accidents, 449 principles of, 455 receiving station in U. S. Army (illus.), 451 spark gap, 447 stations, shore (illus.), 446 stations on trains (illus.), 450 transmission automatic (illus.), 453 transmission of messages (illus.), 453 what kind of signs are used in? 446 why don’t the message go to the wrong stations, 455 world-wide use, 454

=Wires=, copper telegraph, 266 how put underground (illus.), 76 wire-wound gun, 54

=Wonders= performed by electric lift magnet (illus.), 326

=Wool= beaming (illus.), 89 bobbin in weaving machine, 86 Burling (illus.), 88 burr picker, 87 carding, 85 carding, finisher in cloth making (illus.), 89 chloride of aluminum in making cloth, 87 cleaning, 85 made clothing from, 81 combing (illus.), 86 cost of in a suit of clothes, 83 crop of the United States, 82 dyeing, 85-87 fabrics, 85 fiber description, 83 finishing, box (illus.), 87 finish, perching (illus.), 90 fulling cloth (illus.), 90 gilling after carding (illus.), 86 gilling and making top after combing (illus.), 86 gilling (illus.), 87 greasy matter in, 84 how we get it off the sheep, 82 how much does a sheep produce, 83 how much does America produce, 82 how made into cloth, 85 how woolen cloth is made perfect, 88 how shipped, 82 loom, 86 mending, perching (illus.), 88 mending room (illus.), 88 woolen mule spinning (illus.), 89 napping, 89 next to food as a vital necessity, 81 piece dyeing (illus.), 90 quality of a hundred years ago, 83 raised to sell to manufacturers, 81 reducer machine in wool making (illus.), 87 ring twisting (illus.), 89 shipped to manufacturers, 82 shuttle in weaving, 86 scouring (illus.), 85 sorting (illus.), 84 spinning process, 86 spinning, 89 English cap spinning, 89 in one suit of clothes, 83 sulphuric acid solution in making cloth, 87 teasel, 89 tramper, 82 in United States, bulk of, 82 warp thread, 86 web, 86 weaving (illus.), 88 where does most of our wool come from? 81 woof of, 86 made into yarn, 86 yarn inspecting (illus.), 89 yolk of, 84

=Woolen cloth=, ready for market (illus.), 90

=Woolens and worsteds=, difference between, 84

=Woolworth building= (illus.), 395

=Words=, formation of, 19 the first over a telephone, 74

=World’s= bread loaves (illus.), 459

=Worry=, definition of, 207 what it is, 207 Why we, 207

=Worsted= carding (illus.), 85 fabrics, 85

=Worsteds and woolens=, difference of, 84

=Wright Brothers=, first successful flights, 130

=Wrinkles=, what causes, 196

=Writing=, brush, the (illus.), 13 earliest ways of, 12 first done upon rocks, 11 first imitation of, 12 first metallic pen introduced, 15 fluids for developing, 13 how man learned to, 11 how the monks did their, 14 how a pen writes, 18 modern way of, 16 paper for, earliest, 14 pen, invention of, 11 pen, first steel (illus.), 15 quill, the (illus.), 14 Reed, the, in (illus.), 12 steel tube pen in (illus.), 15 steel pen, modern (illus.), 16 Stylus, the (illus.), 11 with chalk, 18 why a pencil writes, 18

=X-rays=, what are they? 307

=Yankee=, where word originated, 243

=Yarn=, made from wool, 86

=Yawning=, why do, 173 is it infectious, 192

=Yeast=, what it is, 288 why it makes bread rise, 288

=Yes=, meaning of nod, 19

=Zollner, Casper=, inventor of rifling, 46

Transcriber’s Notes

The language used in this ebook is that of the source document, including unusual or archaic spelling. The book was partly written by representatives of the industries concerned; inconsistencies in grammar, spelling, punctuation (including the use of decimal points and commas), style, lay-out, etc. have been retained. Contradictions and repetitions have not been addressed. Alphabetical sorting inconsistencies in the index have not been corrected.

Page 218, ... and have them meet as shown in Fig. 13 ...: The illustrations in this chapter are not numbered. The illustration on page 215 shows the described meeting of the shields.

Page 305, ... (as shown in Fig. 4): the illustrations with this article are not numbered.