. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . CQ H ra.£c > to,c TO qjTO 03 — C f£H£ o nj cfl toM o to v ■ V ^ £ W &- tdvf ^3- o *°£~ fiOJOC03 o —C 3«o o <* - °-2 c 3 o ,£ TO ~ 03 o5 U c c a .- •<k. TO —*j TO *r £. MIRACLE OF THE AGE 97 off the tremendous amount of excess heat up and into theair and the ice at the bottom remains in its original stateunmelt
. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . CQ H ra.£c > to,c TO qjTO 03 — C f£H£ o nj cfl toM o to v ■ V ^ £ W &- tdvf ^3- o *°£~ fiOJOC03 o —C 3«o o <* - °-2 c 3 o ,£ TO ~ 03 o5 U c c a .- •<k. TO —*j TO *r £. MIRACLE OF THE AGE 97 off the tremendous amount of excess heat up and into theair and the ice at the bottom remains in its original stateunmelted. CONDUCTION. Then, let us for a moment consider this subject of con-duction as applied to solids. To prove that differentsolids have different conductivity the following experi-ment was evolved. A long copper trough is constructedwith several short tubes projecting into it near the bot-tom. Into these, corks are inserted. Through the middleof each cork there is passed a rod of metal, slate, glass orother substance, one end of which is projected into thetrough and the other end allowed to extend about eightto ten inches outside. The outer part of each rod is dippedin paraffin wax, which melts at 140 degrees F. Whenthis wax cools on the rods it forms a solid coating. Thetrough is then filled with oil and heat applied to boil theoil. This heat is carried along the different bars by con-duction, melting the wax coating to a different extent inea
Size: 1257px × 1989px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidradiomiracle, bookyear1922
