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

By Albert G. Ingalls

Backwoods Philosophy-Everest replicate Making Sub-diameter instruments steel Mirrors and residences Astigmatism-Warner Prisms, residences, Mirrors- creation A Quantitative Optical try for Telescope Mirrors-King acting the Ronchi attempt Quantitatively The Hartmann Test-Calder Flats-Selby Notes the of Optical resting the right way to Make Eyepiece Lenses The Refractor-Metal components 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 move Telescope Drives-Lower for higher 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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Extra info for Amateur Telescope Making Advanced, Book Two (A Sequel to Amateur Telescope Making, Book One)

Sample text

Prt,h,iire used, c1i;imrtir :irid tliiclíness of tlic f:icets. Pitcli 1i;irdiiess is liriiitrcl to tlie point wliere ileeks are likcly t o result. With fine optical rouge, 20 sec. pitcli for plate glass ;ind 40 sec. for Pyrex ieem t o I)e íil)out the maximum safe limits. Witli cnre in washing the roiige and applying it t o the l;iy:, tliese limits may be e x c e d e d by experienced worlcers. Hut, for safety a i t l i super-hard laph, it is good insurcince t o piiint on the tliiriiiest possible laminkition of aboiit 10 sec.

Hren some\vliere nrnr nn nvertipe of tlie tmo :lbore conditions, very little c1i:iiige will be seen. Tlie average worlcer docsn't rrnlizr the nmount of lie:it gener:rted. t :rll j~olisliirig mork is dissipatcd i r i tlie forrn of lie:it, iii contrast t o gririding wliere rnoit «f tlie work pcrfornird goes into the actu:il rerriuval of glass. , a 10" to lS0 F. rise in temperature will be found to be a iiorixi:il oc- MIRROR MAKING 31 currence after a sprll of polisliirig. Sliis w;is iictiinlly clirckrtl hy n tlicrrnocouple sealed in tlie bottoiri of a liole drilled ne:irly througli a mirror.

I n using the blending overhang stroke, t o rcmove a central bump, the marginal f:icets should be well pressed down, using an overliang well out t o the edge of the lüp. As soon a s this is done the overliang should be pulled in a bit t o prevent forming a hole. If a hole shoulcl start, remove the crater around i t at once with a ~ p i n n i n g overhang, rotating the mirror rapidly with the palrns of the two Iiands against the side of tlie handle flange, keeping tlie crest of the crater just inside the rim of the l a p and gradually w o r k i n ~the mirror t o new positions t o equalize ttie facet action.

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