Download PDF by Albert G. Ingalls: Amateur Telescope Making Advanced, Book Two (A Sequel to

By Albert G. Ingalls

Backwoods Philosophy-Everest replicate Making Sub-diameter instruments steel Mirrors and residences Astigmatism-Warner Prisms, apartments, Mirrors- creation A Quantitative Optical try out for Telescope Mirrors-King appearing the Ronchi try Quantitatively The Hartmann Test-Calder Flats-Selby Notes the of Optical resting easy methods to Make Eyepiece Lenses The Refractor-Metal elements and Mounting-Taylor The Refracting Telescope-Principles of Operation and ConstructionHaviland as a rule 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)

Example text

Conip~ire tliis ~vitli tlic cli~ilk rnarli tind there's the answcr. One T N ' s wife added a can of cliloride of lime t o the technic. Son-eraporating iiquidi siicli'as tliin oil or glycerine are unnccess;iry for * Let the r e n d e r jiidze mlietlier tiir autlior's hacliwnrd ~vritinx 2nd nrriiiigrsrrirnt ar.. -Erl. d ho quicl

Fifteen seconds of work, and fifteen seconds of pressing is tlie riile. Tlie worlcer iiiust feel tliat lic is pushinp material away from tlie center of the niirror rvitli tlie edge of tlie lap. If unexpected higli zoncs clerelop, tliey rn:iy b r treated u-itli the bleiidiiig overhang. In fact, the final stages of figuriiig \vil1 generally deve1011 into a mixture of long strokes and tlien overh:iiip, alternnted in order t o Iceep tlie curlre smooth. ; tlie presscire mnst be tapered during the stroke t o p r r r e n t the forination of unc1esiral)le zones.

A circular grinding tool of cast iron 31%" (80 crn) iii (li:inieter, ras use<] in al1 of the firic grindiiip of tlie large concave surf;ice. Iii polisliing tliis coricavc, and in bringinp it t o an optically perfect spherical surface preparatory to parabolizing, a 90' sector-shapecl polishing tool of exactly cine-fourth the area of the large glass was used with the best results. 8 cm) in diameter was exclusively used in securirig the necessary cliange of curvature from ceiiter t o edge of the glass; in addition t o t l i i ~the 90° sector tool, used with long diametrical and chordal strokcs, Tras fourid to be of great value in smoothirig out the pnrnboloid:il surf:

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