By Allyn J. Thompson
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Additional resources for Making Your Own Telescope (Dover Books on Astronomy)
Don't do that over the range. It takes little or no turpentine for this, so use it carefully. Stir completely and back attempt the mood. To harden pitch, cook dinner it for an extended interval. including a volume of rosin will harden it. No pitches are alike, so special proportions can't be given, however the quantity of rosin extra ought to not exceed the amount of pitch. a few laps are made entirel y of rosin; those are best suited for warm climates. whereas the pitch has been melting, in part fill the pail (which has heen completely wiped clean Ollt) with water as sizzling because the hand" fifty one S2 MAKING your individual TELESCOPE can tolerate, and entirely immerse reflect and power, standiug them on their edges and resting them opposed to the perimeters of the pail, on the way to be fast reached whilst sought after. Have a section of cleaning soap available in a fresh dish. The software and replicate may be al- Fig. 27. The channeled lap. lowed to warmth via ahead of you pour the lap. After the pitch has been totally melted and tempered, get rid of it from the range and make allowance it to chill a bit, because it is healthier to not pour boiling scorching pitch at once onto the software. Now get rid of the device from the recent water, dry it, and wrap the paraffined paper collar round it. There could be sufficient warmth within the glass to reason the overlapping ends of the collar to advert· right here. provide the pitch a last thorough stirring and pour it onto the instrument as much as the extent of the collar. while it has thickened sufficient to keep its form, get rid of the collar. cleaning soap the channeling software and press the channels into the nice and cozy pitch all the way down to the glass, as in Fig. 27. commence on the heart, and find the 1st channels in order that the heart of the lap will lie simply THE PITCH LAP fifty three inside of one nook of a sq.. this can be to prevent a uniform radial distribution of the squares, and so hinder zonal earrings at the replicate. Press the channels in a single path first, then press the opposite set at correct angles. Take the reflect from the recent water, quick cleaning soap its floor, and slide it approximately at the lap, progressively expanding the strain. The channels should be ultimate in now, so change the reflect within the scorching water, and move over the channels back. keep on with with the soaped replicate. those steps can have to be repeated or 3 times ahead of the lap has hardened sufficiently to continue its form. through right manipulation, any tendency for concavities to advance within the squares may be ironed out. by the point the pitch has hardened, the lap may still precisely agree to the curve of the reflect. get rid of the replicate and wash it off in transparent water. utilizing a pointy knife, with a company shearing stroke lower away the pitch overhanging the sting of the software. Incline the knife for you to provide a mild bevel to the lap. The knife, or a razor blade, can be utilized to widen any channels which may have closed in. do that carefully or huge fragments of pitch may well get away. an outstanding width for the channels is ljg". Flush the lap below a cold-water faucet to scrub off the cleaning soap and any pitch fragments, and dry it. soften down a few beeswax in a can. arrange a broom for the wax: a skinny stick of wooden a similar width because the squares, with a chisel-shaped aspect, over which 3 or 4 thicknesses of gauze bandage or related fabric are wrapped and tied with string.