Rachel Hutchinson Telescopic Table
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Replacement Director Chair Cover – Available in Various Colors Replacement Director Chair Cover – Available in Various Colors… |
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9ft Umbrella Replacement Canopy for 6 Ribs in Natural (Canopy only) Replacement umbrella CANOPY ONLY for 9ft 6 ribs -Fits 6 ribs umbrella frame, ribs from 52″ to 54″ -300 denier polyester with UV treated and water repellent -Actual Weight: about 4 pounds -Reinforced Grommet Size: 3/4″ Diameter **NOTE: If the grommet is too small, please cut around it and screw the finial on tightly…. |
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The Telescope $8.45 The Telescope |
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Telescope $17.78 Telescope |
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TELESCOPE: TELESCOPE $8.8 TELESCOPE: TELESCOPE |
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EdIn OMEGA REFRACTOR TELESCOPE $80.99 Educational Insights OMEGA REFRACTOR TELESCOPE. Explore the universe, even deep-sky phenomena, with this powerful 700mm refractor telescope. Great for explorers of any age. SMALL PARTS [1]. Not for < 3 yrs. Grades 3+ Ages 8+ |
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The Telescope and Microscope $24.48 Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: the focal distance of a convex lens. Let a b, fig. 4, be a convex lens, and c d parallel rays Fig. 4. proceeding from the sun; those rays, after passing through the lens, will converge to a point e. Hold the lens opposite to the rays of the sun, and observe where the rays converge to a small spot as at e. This spot is the image of the sun formed by the lens; measure the distance between the lens and the spot; it is the focal distance required. Section III.?Description of common refracting There are various kinds of refracting telescopes, which we shall describe in their order, commencing with that which is the most simple, and most easily understood. 1. The astronomical telescope.?The only parts essential to this telescope are two lenses, A D and E Y, fig. 5. A D is the object-d/ass, and E Y is the eye-glass. Let o B be a/aistant object, from which rays proceed Jrfearly parallel to A D, the object-lens. The ray’s passing through this lens will form an image of the object in its focus at i M, and as the rays cross each other it will be inverted. E r, the eye-glass, is placed exactly at its focal distance from this image, and must be of a much shorter focal distance than the object-glass. The magnifying power in this telescope is in the proportion of the focal distance of the object-glass to that of the eyeglass. Suppose the object-glass to be of twenty- four inches focal distance, and the eye-glass one inch, the magnifying power is then as one to twenty-four; in other words, it makes a distant object appear twenty-four tunes nearer, and twenty-four times larger in size than it is to the naked eye. If the eye-glass had been one and a half inch focal distance, the magnifying power would have been only sixteen times. Through this telescope all objects appear invert… |
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S107 Helicopter Replacement Parts (Blue) $9 S107 Helicopter Replacement Parts (Blue) |
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S107 Helicopter Replacement Parts (Yellow) $9 S107 Helicopter Replacement Parts (Yellow) |
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Roeder Replacement Parts for Manipulation Test $92.48 Replacement parts for Roeder Manipulation Test |
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Amateur Telescope Making in the Internet Age: Finding Parts, Getting Help, and More $41.98 Building an astronomical telescope offers the amateur astronomer an exciting challenge, with the possibility of ending up with a far bigger and better telescope than could have been afforded otherwise. In the past, the starting point has always been the grinding and polishing of at least the primary mirror, a difficult and immensely time-consuming process. But now that the Internet has brought us together in a global village, purchasing off-the-shelf goods such as parabolic mirrors, eyepieces, lenses, and telescope tubes, is possible. There are also a vast number of used mirrors and lenses out there, and it is now possible to track them down almost anywhere in the world. Online stores and auction houses have facilitated commerce regarding all sorts of useful optical components at a reasonable price. This is a book about making telescopes from available parts. It provides guidance on where to look and what to look for in selecting items useful for telescope making and explains how to assemble these components to produce an excellent instrument on a tight budget. At one time, many amateurs made their own telescopes from home-made parts. In today’s rushed world, that has almost become a lost art. The Internet offers a wonderful alternative to either buying a pricey scope fully assembled or making your own from scratch. |
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Automatic Shifter Replacement Parts Shifter Knob $15.99 Shifter Service Parts |
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Making Your Own Telescope $6.98 Complete, detailed instructions and numerous diagrams for constructing a do-it-yourself telescope. No complicated mathematics are involved, and no prior knowledge of optics or astronomy is needed to follow the text’s step-by-step directions. Contents cover, among other topics, materials and equipment; tube parts and alignment; eyepieces, and related problems; setting circles; and optical principles. 1973 ed. Appendixes. Index. 6 plates. 100 figures. |
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Vollrath 9602 Spring, Replacement Parts $11.39 Spring, Sauce Boss and Batter Boss replacement parts |
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Amateur Telescope Making in the Internet Age $19.99 Building an astronomical telescope offers the amateur astronomer an exciting challenge, with the possibility of ending up with a far bigger and better telescope than could have been afforded otherwise. In the past, the starting point has always been the grinding and polishing of at least the primary mirror, a difficult and immensely time-consuming process. But now that the Internet has brought us together in a global village, purchasing off-the-shelf goods such as parabolic mirrors, eyepieces, lenses, and telescope tubes, is possible. There are also a vast number of used mirrors and lenses out there, and it is now possible to track them down almost anywhere in the world. Online stores and auction houses have facilitated commerce regarding all sorts of useful optical components at a reasonable price. This is a book about making telescopes from available parts. It provides guidance on where to look and what to look for in selecting items useful for telescope making and explains how to assemble these components to produce an excellent instrument on a tight budget. At one time, many amateurs made their own telescopes from home-made parts. In today's rushed world, that has almost become a lost art. The Internet offers a wonderful alternative to either buying a pricey scope fully assembled or making your own from scratch. |
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Replacement Sleeve $62.99 Replacement Sleeve |
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George Kovacs Replacement Parts $5.25 Replacement Glass and Metal Shades for George Kovacs fixtures. |
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Pull-Out Piece of Furniture with Two Parts $39.99 Pull-Out Piece of Furniture with Two Parts – Giclee Print |
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Modern Fan Replacement Parts $12 Replacement light kits and replacement blade sets for ceiling fans by Modern Fan Company. |
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Einstein’s Telescope $17.33 Einstein’s Telescope |