Download Webb Society Deep-Sky Observer's Handbook: Double Stars by Kenneth Glyn Jones PDF

By Kenneth Glyn Jones

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Additional info for Webb Society Deep-Sky Observer's Handbook: Double Stars (Volume I of Observational Handbook Series)

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T~e grating and:p05ition circ1e5'5hould Ье 50 arranged 5uch that when С е POlnter (рага11е1 to the s1its) shows а РА of 900 or 270 the images th horlzonta11y . a11gned and hence para11e1 to the direction of drift of The pairs 24 Сот (STF гез eca~d gamma Ari (STF 180) have position ang1es of 2700 and 180~ Р tlvely and they сап а1БО Ье used to check the setting. аге ;~5~~uatoria1 star with the te1escope stationary. д" Fig 22. Eyepiece wire method for determining Light flux. 0 P01aris. Duruy used 7 arc seconds) and to orient the grating БО that the images are aligned Е - W in the stationary te1escope.

Graphy (and stellar images essent1ally p01nt 1mages) let us cons1der а photographic emulsio are had previously been un-exposed to light and upon which а point of n ~hat of very small dimension is allowed to fall. The silver halides 119ht . the form of уегу sma11 crysta1s, and for reasons sti11 not comp1аГе lп understood, the action оГ light is to produce in them what is ca1~te1y 'latent image'. This means that if, sUbsequent to exposure the ет 1e~ а is acted оп Ьу а suitable reducing agent, or DEVELOPER, the aг~ 51оп crystals оГ silver ha1ide will Ье reduced to metallic silver, Whichected the fine1y di vided form i t takes, appears blaCk.

2 are read as in the first method and р and е сап Ье obtained from: f vhere rI.. = AdjustabIe vernier. Fig 24. Micrometer case. А method of mounting а То measure the separation configurations which сап Ье used. Locating bolts. а grating to of а pair reflecting telescope. there are two main . -. А • в' ... " .... 1 .... -----!. ~2 • А в" А. \ = (О<::: 1 + 0(2 as in the method of right angled triangles. А". 25(a)) is adjudged to Ье а right angle. The read ing оп the circle ,«1, corresponding to this position is noted.

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