http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/ Yesterday's tomorrow, today. Fri, 10 Feb 2012 20:39:58 +0000 hourly 1 http://wordpress.org/?v=3.1.4 http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/comment-page-1/#comment-1080394 M.S.W. Fri, 20 Aug 2010 15:05:16 +0000 http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/#comment-1080394 Wow 500Watt bulb. Must have cost a fortune back then to keep that thing going. Wow 500Watt bulb. Must have cost a fortune back then to keep that thing going.

]]> http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/comment-page-1/#comment-1080372 Timmay Thu, 19 Aug 2010 15:06:37 +0000 http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/#comment-1080372 Very informative, thank you. And yes I do remember the last one quite well. Right down to the trapezoid door to access the bulb. Very informative, thank you.
And yes I do remember the last one quite well. Right down to the trapezoid door to access the bulb.

]]> http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/comment-page-1/#comment-1080346 Firebrand38 Thu, 19 Aug 2010 00:56:17 +0000 http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/#comment-1080346 You were told wrong. 1939 Principle used in bowling alleys http://www.google.com/patents?id=XSRiAAAAEBAJ&pg=PA1&dq=2250174&source=gbs_selected_pages&cad=2#v=onepage&q&f=false 1941 same inventor http://www.google.com/patents?id=Dq9gAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q&f=false 1944 civilian http://www.google.com/patents?id=iLtwAAAAEBAJ&pg=PA1 1948 (filed) civilian http://www.google.com/patents?id=1CpJAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q&f=false 1948 another civilian http://www.google.com/patents?id=pYVxAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q&f=false 1963 The one we all grew up with http://www.google.com/patents?id=Tj5zAAAAEBAJ&pg=PA1&dq=overhead+projector&source=gbs_selected_pages&cad=2#v=onepage&q&f=false You were told wrong.
1939 Principle used in bowling alleys http://www.google.com/patents?.....38;f=false
1941 same inventor http://www.google.com/patents?.....38;f=false
1944 civilian http://www.google.com/patents?.....038;pg=PA1
1948 (filed) civilian http://www.google.com/patents?.....38;f=false
1948 another civilian http://www.google.com/patents?.....38;f=false
1963 The one we all grew up with http://www.google.com/patents?.....38;f=false

]]> http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/comment-page-1/#comment-1080345 Timmay Thu, 19 Aug 2010 00:10:41 +0000 http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/#comment-1080345 I was once told that the over-head projector was invented by the military so that instructors could keep an eye on sleepy GI's. I was once told that the over-head projector was invented by the military so that instructors could keep an eye on sleepy GI’s.

]]> http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/comment-page-1/#comment-390508 iswandoyo Thu, 09 Aug 2007 08:51:45 +0000 http://blog.modernmechanix.com/2006/05/12/new-projector-throws-illustrations-behind-speakers-back/#comment-390508 good one ! good one !

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