David Crosthwait

David Crosthwait was born in May 27, 1898 and holds 39 patents in the U.S. and 80 patents internationally for his advances in air ventilation, and heating and cooling methods for such devices such as air conditioning, refrigeration, and heating systems. In 1913 he earned his Bachelors of Science

See-through Laptop Display

Among the news from CES: a prototype AMOLED laptop display sports 40% transparency, so one can see through the screen. Two questions: first, what does the display look like from the backside? Second, how and why does a screen that appears harder to use than a normal opaque display evoke so much exci

Developing Nonlethal Weapons

All kinds of nonlethal weapons are being perfected. These include laser dazzlers to warn the opposition to retreat, long-range acoustic devices that deliver ear-piercing warnings, electromagnetic pulse (EMP) cannons that disable vehicles, and more. Notably effective against civilian uprisings like r

No Place for Screens?

Automakers want us to have internet-connected dashboard computers. Should drivers be able to check their Facebook pages while on the highway? Do you find yourself texting, talking, or otherwise distracted while driving? Car makers are giving drivers Internet access because (they say) that's what dri

inverter

hey guys!!!!!! i saw an inverter ckt which i cant undrstnd one thing.in that ckt they used 13 0 13/230V transformer(for stepup the supply from battery,after conversion to A.C).but the amazing thing is they connected the battery red terminal directly to the 0 terminal of transformer and the other two

Cheap Timer

Looking for very cheap timer circuit

Spec

Supply is 9v needs to be activated by simple push button (no hold) & have a switch selector to enable timer to operate for 1 min, 5min & 15min.

Looking for this to be extreemly small due to space avaialble so No relays

Thanks

Pipe Robot

My associate has designed a wireless piping robot that can take continuous 360 degree photos and measurements good for 300 ft. travel. Present unit is suitable for diameters of 6 inches to 16 inches. We are interested in adding to the capabilities so if you have any suggestions on added features fo

Green sand

Good day,

If i where to add new silica sand on green sand system, what are the factors to consider? or what test do i have to conduct in order to know how many silica sand will i put into green sand? can anyone please help me, thanks.

Camouflaging An Airplane Factory

From mental_floss Blog:

I found these pictures on Think or Thwim and was blown away. Back in the 40s, during the war, the Lockheed Air Terminal in Burbank was not only Los Angeles' main airport, but a massive facility that produced warplanes from the P-38 to the B-17 bomber. Lo

Rebecca Cole

Rebecca Cole broke through many barriers for both women and African Americans. Cole was incredibly dedicated to helping less fortunate women and giving them access to an education. During her medical education, Cole herself benefited from the work of others who wished to give women access to

Garrett A. Morgan

Garrett A. Morgan was born in Kentucky in 1877. He was the seventh of eleven children born to Sydney Morgan, a former slave who was freed in 1863. Garrett Morgan spent many years teaching himself to repair sewing machines before opening his own business specializing in sewing machine sales and re

<I>Avatar</I> Shmavatar?

Mechanical exoskeletons are being advanced by military and industrial organizations to amplify human muscle functions. Related research has been funded by governments and corporations but the only visible evidence of such technology appears in Hollywood film fantasies such as Avatar. Do you think th