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    "label": "Excerpt from Scientific American Magazine",
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    "id": "7077467",
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    "contentType": "document",
    "title": "Excerpt from Scientific American Magazine",
    "description": "This item contains an excerpt about telescoptics from Scientific American Magazine.",
    "citationUrl": "https://catalog.archives.gov/id/7077467",
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        "Russell W. Porter Papers",
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        {
            "logicalDate": "1940-08-01",
            "month": 8,
            "year": 1940
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{
    "seq": 5,
    "pageIndex": 0,
    "type": "photo",
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    "ocrText": "TELESCOPTICS\nSHORTER POLISHING TIME\nscrews, the polar axis of the instru-\nPierce's #6 Finishing Abrasive gives the best ground sur-\nment can be directly fixed.\nface we have seen in 20 years of experiment.\n\"I find that the time can be relied\n50c per ounce.\non well within one minute. The glass\nNEW HYBRID! The Newtellian Telescope! Excellent\nflask was resorted to in order to pro-\nperformance and easily constructed. Theory of the\ntect all essential parts from the birds,\nHerschellian telescope developed.\nwho seemed to feel that I had made\nRevised Hobbygraf #9\n300\na gadget for their special benefit. The\nPortable Mount with Pipe Tripod. Very rigid yet light.\nFor 6\" or smaller telescopes\n$10.00\nneck of the flask and a part of the\nALL INCLUSIVE TELESCOPE KITS. Proper glass,\nsphere were removed with a 'biscuit\nclean abrasives in tin boxes, including our new #6, best\ncutter' (simply a cylinder of sheet\nrouge, real pitch, an EYEPIECE, an ALUMINIZED\nmetal) and abrasive. The plate of the\ndiagonal mirror, and COMPLETE INSTRUCTIONS.\nclock, having nearly twice the radius\n4\"\n$4.00\n6\"\n$6.00\nof the sphere, was spun to its required\nWithout eyepiece or diagonal,\n4\"\n$3.00,\n6\"\n$5.00\ncurvature. All the machining was\nFree test of your mirror. Write for catalogue of supplies.\ndone on a wood-working lathe and\nTWENTY YEARS OF EXPERIENCE TO HELP YOU\ndrill press in the pattern shop here at\nThe California Institute of Technol-\nJohn M. Pierce\n11 Harvard St.\nSpringfield, Vermont\nogy. Figure 5 is a photograph of an-\nother spherical globe sun-clock made\nKITS OUR SPECIALTY\nBUILD A PRISMATIC REFRACTING TELESCOPE\nearlier and partly similar.\"\nWe will sell you raw glass and rough castings\nAnd still another! Some months\nor finished prisms and lenses and machined\nafter the above descriptions were re-\n4\" kit\n$ 2.95\nPyrex\n$ 4.25\ncastings or finished instruments.\nceived, there arrived from Porter a\n6\" kit 3.75\nPyrex\n5.50\nWrite for free literature and prices. Blue Prints\nand Instructions Furnished.\nnote (Figure 6) and the following\n8\" kit 6.75\nPyrex\n8.50\nAlso, Parabolized Pyrex Mirrors.\ndescription \"The clock to be described\n10\" kit 9.95\nPyrex\n13.95\nROBERT R. CARTER\nis about my tenth design and its per-\n2125 Spaulding Ave.\nBerkeley, Calif.\n12\"\nkit\n14.75\nPyrex\n24.00\nformance has been so satisfactory that\nKits contain 2 glass discs, 8 grades of abrasives\nEVERYTHING FOR THE\n(fewer do not insure an optically perfect surface),\nrouge, pitch or beeswax, and instructions.\nAMATEUR TELESCOPE MAKER\nEQVATORIAL Rino\nMoney-back guarantee that\nPrecision Workmanship, Good Quality,\nLow Prices. Money Back Guarantee\nTHESE KITS ARE SECOND TO NONE\nREGARDLESS OF PRICE\nITS-OUR SPECIALTY\nLENS\n4\"\n$2.95 PYREX\n$4.00\nPYREX MIRRORS\n6\"\n3.75 PYREX\n5.50\nONJECTIVE\nMade to order, correctly figured, polished, and\nparabolized. Precise workmanship guaranteed.\n8\"\n6.50 PYREX\n8.00\nPrices on request.\n10\"\n9.75\nPYREX\n13.75\nPYREX\nWE DO POLISHING, PARABOLIZING, AND\nOTHER SIZES PROPORTIONATELY LOW\nFLASK\nSUN'S\nALUMINIZING\nEach kit has 2 glass discs, correct thickness, tem-\nIMAGE\npered pitch, rouge, 8 assorted abrasives (fewer may\n(Send for our NEW, ENLARGED, and ILLUS-\nnot give perfect optical surface), instructions, etc.\nEYE PIECE\nTRATED catalogue.)\nFREE ALUMINIZED DIAGONAL with each kit\n6\" kit with book \"Amateur Telescope Making\" $6.25\nM. CHALFIN, 1425 Longfellow Ave., New York, N. Y.\nALUMINIZING\nPINION AND\nThome SCRIW\nA harder and brighter aluminum coating that\nproduces a lasting and superior reflecting\nsurface. Guaranteed not to peel or blister.\nLATITUDE ADJ.\nFY\nFor\n6\"-$2.50\n8\"-$3.50\n10\"-$5.00\nADJUSTING\nOther Sizes Proportionately Priced\nSCALWS\nScientific and Technical Books\nMIRRORS TESTED FREE OF CHARGE\nKELLNER EYEPIECES\nPier\ntry our BOOK DEPARTMENT\nU. S. Government 1\" F. L. Kellner achromatic re-\nmodelled and fitted into our standard 1¹/4\" brass\nSCIENTIFIC AMERICAN\ncells. You should own one-no matter how many\neyepieces you have.\nFigure 4: The bird fooler clock\nWORTH $8.00. SPECIAL PRICE\n$4.00\nMIRRORS, ALL SIZES, MADE TO ORDER\nPRISMS - EYEPIECES - ACCESSORIES\nI have decided to call it quits and turn\nFREE catalog Telescopes, Microscopes, Binoculars,\nthe information over to those who\nmay wish to have a gadget in their\nSurface Hardened\netc. Instructions for Telescope Making, 10c.\nPRECISION OPTICAL SUPPLY CO.\n1001 E. 163rd Street\nNew York City\ngardens demonstrating an interesting\nALUMINIZED\nproblem in celestial mechanics.\n\"The drawing (Figure 7) is a meri-\nCoatings\nC. C. YOUNG\ndian section through the instrument\nSupplies for Amateur Telescope Makers.\nand for economy of space I have in-\nare uniformly superior in reflectivity and im-\n6\" Equatorial Mounting $35.00\nserted, or superposed, the clock face\nprove the performance of telescope mirrors,\nWrite for new Catalogue\nprisms, diagonals, camera mirrors, range\n517 Main St.\nEast Hartford, Conn.\nin the central area, but its true posi-\nfinder mirrors and other optical front surface\ntion is shown in Figure 8.\nmirrors.\n\"A is a 12-liter Pyrex flask (Corn-\nThese Surface Hardened Coatings are dur-\nable and cohesive. They do not blister or peel\nMake a Galilean Telescope with which Galileo\ning Glass Works-it cost $3.50), whose\nand can be removed easily without repolish-\nupset a world!\nneck B has been removed with a bis-\ning and refiguring mirror.\nTelescope Objective, 40\" focal length, 3\" clear\nUsed in some of the largest observatories on\ndiameter.\ncuit cutter. The flask is remarkably\nmirrors which are famous throughout the\nNon acromatic. Ground and polished by the\nspherical.\nworld. Have your mirrors coated with the best.\nworld's largest optical company. Optical sets\n\"To this sphere are attached the\nPrices -$1.75, 6\" $2.50, \"-$3.50, 10\"-\nconsisting of objective and 1 negative eyelens.\nlens C and the brass strip D on which\n$5.00 and 12¹/2\"-$8.00. Up to 36\" on request.\nChoice of powers 4¹/2 dia. or 61/2 dia.\n$3.00 postpaid.\nis pasted the analemma.\nLEROY M. E. CLAUSING\nHARRY ROSS-Scientific & Laboratory Apparatus\n\"In the space removed by the bis-\n720 Greenwood Ave.\nWilmette, III.\n68-70 West Broadway, New York, N. Y.\ncuit cutter is the clock dial E, carrying\na minute hand. Behind the clock face\nis a reduction gear box operated by\nthe thumbnut F. Only two pairs of\nWhen you write to Advertisers\nstock, 32-pitch spur gears (Boston\nGear Works, Cat. No. 1-G 159, 161,\nThe Editor will appreciate it if you will mention that you saw it in\n177, 179) are necessary to make the\nS\nA M E R C A N\nminute hand revolve 24 times during\nAUGUST 1940\nSCIENTIFIC AMERICAN\n107"
}