Get Amateur Telescope Making Advanced, Book Two (A Sequel to PDF

By Albert G. Ingalls

Backwoods Philosophy-Everest replicate Making Sub-diameter instruments steel Mirrors and residences Astigmatism-Warner Prisms, residences, Mirrors- construction A Quantitative Optical try for Telescope Mirrors-King appearing the Ronchi try Quantitatively The Hartmann Test-Calder Flats-Selby Notes the of Optical resting how you can Make Eyepiece Lenses The Refractor-Metal elements and Mounting-Taylor The Refracting Telescope-Principles of Operation and ConstructionHaviland mostly at the goal Lens objective Scopes-Kirkham For the Rifleman checking out Convex round Surfaces-King Collimation and Adjustment Diagonal stream Telescope Drives-Lower for better Telescopes Spring Drives for Telescopes The Springfield Mounting-Pattern Making-Porter With of Molding and Casting Molding and Casting Parts-Ferson Molding and Casting a Fork-Mason Springfield Mounting mideligw on Molding and Casting Machining the Springfield Mounting-Porter Motor Drives, Counterweighting, Pier-Springfield Mounting-Porter....

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Additional resources for Amateur Telescope Making Advanced, Book Two (A Sequel to Amateur Telescope Making, Book One)

Sample text

If it doesn't, the pressure sliould be relieved, ancl tlie proper polisliinp d r a g secured by corre<+. adjustment of the roiige mixture. To deteriiiirie tliis, s t a r t witli a niixtiire Iinving tlie consistency of tliick crr:im. Witli tliis the rouge granules will : ~ c tlike so m:iny h;ill benrings, allowing the mirror to slide eti5ily orer tlir Izip nnd making tlie facets inviiible tlirciugh the mirror. This, of coiirse is not a true polisliing action. Graclunlly add water, a few drops a t a time t o exposed areas of tlie 1x11, iiotirig Iiow tlie d r a g grndually increnses as tlie oiitlines of tlie facets begiri t o appear.

For srriall pitcli polisliers, tlie glass feet used iinder furiiiture legs make excellent tools, giviiig a good grip for the fingers. They should be ground t o approxininte ciirrature apaiiist the rnirror wliile it is still ir1 tlie rougli grinding stage, and of course, no further grinding is necessary. Tliese polisliers riiiist be used with the mirror face up, witli a fine grade of rouge to preverit sleeks, :incl tliey require frequent renewal of tlie rouge rriixture. Deforrriing tlie lap to concentrate its action in certain zories, or remove its action in others, is standard practice u ~ i t hmany amateurs.

After a few optical surfaces have been made, the amateur learns frofn past experience how t o appiy the necessary preventire measures t o bring the mirror througli spherical and to elin-inate most of the correction mentioned above. But i t does no harm t o get ihto al1 this mess a t least once, so that tlie trirks will be learncd ancl l~el

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Amateur Telescope Making Advanced, Book Two (A Sequel to Amateur Telescope Making, Book One) by Albert G. Ingalls

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