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

By Albert G. Ingalls

Backwoods Philosophy-Everest reflect Making Sub-diameter instruments steel Mirrors and apartments Astigmatism-Warner Prisms, apartments, Mirrors- creation A Quantitative Optical try for Telescope Mirrors-King appearing the Ronchi try out Quantitatively The Hartmann Test-Calder Flats-Selby Notes the of Optical resting find out how to Make Eyepiece Lenses The Refractor-Metal components and Mounting-Taylor The Refracting Telescope-Principles of Operation and ConstructionHaviland normally at the aim Lens goal Scopes-Kirkham For the Rifleman checking out Convex round Surfaces-King Collimation and Adjustment Diagonal circulate Telescope Drives-Lower for greater 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 info for Amateur Telescope Making Advanced, Book Two (A Sequel to Amateur Telescope Making, Book One)

Sample text

Tliis ciirve, htilrt witli :iboiit oiie-qiinrter strokes for tlie first st;ipe of fininp. (;riii(l

Ari alternatire tli:rt is riot su tedious, perhaps, is tapered pressing a t tlie cornpletion of cticli cycle of full strokes, starting with about 20 pounds additional pressure from tlie Iitinds of ttie o p r a t o r , nnd tapering down t o zeru pressure a t the encl of about 15 seconds, xvlirn tlie strokes are resumed. Except f«r rough grinding wnd zonnl correction with small polisliers, the abore threr strokes, of rarious lengtlis as the occasion demands, will meet the requirernents of amateur mirrors.

Rut remcriit)rr tli:it, witli tlie hard lup, tlir strokes must be niiicli longrr to procliice ;i spliere, aiicl to liuld a p;iraholoid tliey must be lengtliencd t o :rboiit tliree (luartcrs tlie diamctcr of tlie mirror. (>prcdii<,irig rvith one-1i:ilf or eveii five-eiglitlis strokes, whntever is necessary to liold ttie diffrnction line at the eclge or to bring u p tlie center polish. Well, tlikit's al1 tliere is l o tlie writer's metliod of rritikirip a iriirror. As soon as the figure reduces to tlie arabo bolo id, the stroke is lengtliened in order t o liold it there until the polisliing is completed.

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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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