Backyard Ballistics by William Gurstelle

By William Gurstelle

This bestselling DIY instruction manual now good points new and accelerated initiatives, permitting usual parents to build sixteen impressive ballistic units of their storage or basement workshops utilizing low-cost loved ones or ironmongery store fabrics and this step by step consultant. transparent directions, diagrams, and images exhibit tips to construct tasks starting from the easy match-powered rocket to the extra complicated tabletop catapult and the offbeat Cincinnati hearth kite. The vintage potato cannon has a brand new evil twin—the piezo-electric spud gun and the electromagnetic pipe gun has joined the corporate of such favorites because the tennis ball mortar. With a robust emphasis on safeguard, the publication additionally offers tips about troubleshooting, explains the physics in the back of the initiatives, and profiles scientists and impressive experimenters resembling Alfred Nobel, Robert Goddard, and Isaac Newton. This publication can be essential for the legions of yard toy-rocket launchers and fireworks lovers who want on a daily basis was once the fourth of July.

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43 44 Part I: Digital SLRs and You Figure 2-10: Digital SLR viewfinders show lots of information along with the big, bright view of your subject. Through the looking glass All cameras form their images by grabbing light through a lens, a series of precision-made elements of glass, plastic, or ceramic. The components are arranged to gather the light and focus it onto the film or sensor at a certain distance, called the focal length. Fixed-focal-length lenses, or prime lenses, always produce the same magnification.

Many offer only poor quality clips at, say, a herky-jerky 10 or 15 frames per second (fps) instead of the standard 30 fps, and resolutions are as low as 320 x 240 or 160 x 120 pixels. You might be limited to 30- or 60second clips, tops. Higher-end, non-SLR digital cameras might give you virtually TV-quality 640 x 480 resolution at 30 fps with decent sound, and recording times as long as the available capacity of your memory card. You can even find in-camera trimming and editing facilities. Because a dSLR’s mirror can’t flip up and down 30 times a second (the current fastest burst capability tops out at around 10 frames per second), you won’t find motion picture capabilities on any dSLR that I’m aware of.

Divide the total number of pixels by 1 million to get the number of megapixels your camera needs to collect for the print. 2MP in my case, but a ballpark figure of 6MP will do. ) Using an image of this same resolution (2,400 x 3,000 pixels), you can print in other sizes, of course, but your printer or the software that drives it must drop or add pixels by using a process called interpolation, or resampling, which applies intricate computer calculations to come up with a reasonably good-looking representation of your original image at a different size.

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