The National Geographic Magazine, Volume 98National Geographic Society, 1950 - Geography Indexes kept up to date with supplements. |
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Page 287
... speed is " more than 350 miles per hour . " Turboprop power is now being tried in transports ( page 321 ) . The National Geographic Magazine = ☆ = National Geographic Society. 287 and at Wallops Island , on the Virginia coast . Results ...
... speed is " more than 350 miles per hour . " Turboprop power is now being tried in transports ( page 321 ) . The National Geographic Magazine = ☆ = National Geographic Society. 287 and at Wallops Island , on the Virginia coast . Results ...
Page 288
... speed in mere miles per hour , each plane now has its " Mach number . " Mach 1 indicates the speed of sound ; Mach .95 is 95 percent of it ; Mach 2 would be twice it ; and so on . Strange Effects at Speed of Sound As they approach Mach ...
... speed in mere miles per hour , each plane now has its " Mach number . " Mach 1 indicates the speed of sound ; Mach .95 is 95 percent of it ; Mach 2 would be twice it ; and so on . Strange Effects at Speed of Sound As they approach Mach ...
Page 420
... speed now made or yet to come ... from 10 to 85 R.P.M. - 7 , 10 or 12 inch ! It's all done with two simple controls a child can operate . Just dial one control for record speed ... 33 % , 45 , 78 or any other speed from 10 to 85 ...
... speed now made or yet to come ... from 10 to 85 R.P.M. - 7 , 10 or 12 inch ! It's all done with two simple controls a child can operate . Just dial one control for record speed ... 33 % , 45 , 78 or any other speed from 10 to 85 ...
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