From the August 1951 ish of Mechanix Illustrated, a modest HOWTO describing a "Snooperscope" that requires a 4,000 to 6,000-volt power-supply to fire infrared light at and through the materials around you.
Construction of the snooperscope: The image converter tube is mounted in a plastic drinking cup 3-1/2 in. high by 2-1/2 in. in diameter. The optical system required depends upon your intended use. We used a small tripod type magnifier lens of 10 power (1 in. focal length) for the front lens and objects from three inches to one and a half feet can be focused. There is no reason why a greater range cannot be had with this lens by moving it closer or farther away from the tube.
After selecting the lens system mount it in a hole cut into the bottom of the cup. A jeweler’s saw or coping saw is ideal for cutting the hole. Paint the inside of the cup with black paint. Black airplane dope works fine. No light other than that from the lens must be permitted to hit the tube. Place an infrared filter between tube and lens to reduce effects of stray white light.
The image converter tube is inserted with the graphite side toward the front lens and the metal ring toward the mouth of the cup. A thin flexible lead from the metal ring connects to the positive side of the power supply. Some tubes were manufactured without this lead, in which case a piece of spring metal pressed against the metal ring will work just as well. The front end of the tube has a graphite ring around it. This is the end where the infrared image is to be focused. The graphite coating is the cathode or negative lead. Connect this lead to the B minus side of the power supply. A piece of spring brass or even the flat sheet metal carefully removed from a tin can should be formed with the fingers so it fits snugly around the cathode terminal.
make this SNOOPERSCOPE and see in total darkness (Aug, 1951)
Five years ago, Derek Deville launched an amateur rocket into the stratosphere in less than a minute. It still stands as a remarkable achievement, and the onboard camera gives a dizzying sense of the speed and height.
Ryan Scott Miller outdid himself with this terrific wheelchair costume that Jeremy will be sporting this Halloween: “This year we put it to a vote and our friends choose the Ghostbusters Ecto-1!” Well-played, sir!
Jason Allemann built a neat LEGO Drawing Machine, inspired by a Spirograph and a 1950s toy called the Hoot Nanny or Magic Designer. It can create many different patterns by changing the configuration of the model,” Allemann writes. “You can also draw multiple patterns on the same piece of paper to create even more complex […]
TV antennas are making a comeback, and the Ghost Indoor HDTV antenna is a great example of why. Unlike the old bunny ear-style antennas, this compact antenna is barely noticeable and picks up channels easily. Plus with the addition of streaming services like Netflix, we find ourselves with plenty to watch without a pricey monthly cable bill. The Ghost […]
I’ve never really felt the need to purchase a smartwatch because a lot of them aren’t very functional, but at just shy of $30, the Martian Notifier Smartwatch was worth checking out. For that low of a price, it actually does feature an impressive amount of functionality, and comes in handy when you don’t want to be carrying around your […]
Geek Fuel is a subscription delivery service that caters to those of us that love comics, gaming, and general geek culture. Every month, Geek Fuel will assemble a box of goodies with a value of $50 or over. The specific items are a mystery, but you’ll always get an exclusive t-shirt not found anywhere else, a full […]