cover image: The Journal of the Astronomical Society of India. July 1913

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The Journal of the Astronomical Society of India. July 1913

1913

President.—As this is the last meeting of the current session under Bye-law 10 the Council have to present to the Society the proposed list for the election of the Council at the next224 REPORT OF THE NIKETING. [...] The focus of the mirror is 80 inches and as the focal point is to reach the lens of the eye-piece (which as the telescope is a Newtonian will be in the side of the tube) the distance from the small mirror in the centre of the tube to the eye-piece must be allowed for. [...] Take this off the focal length namely 80" and we have 731" as the distance from the face of the mirror to the centre of the small flat mirror and also the centre of the hole in the side of the tube for the eye-piece. [...] By putting your hand over the edge of the mouth of the tube see what part corresponds to the place where the flat is furthest from the edge of the mirror and bring this part of the mirror inwards by means of one of the three adjusting bolts by which it is fastened to the tube. [...] Having gone through the process roughly you will probably have to do it again more carefully and then on looking through the hole in the eye-piece you should see the following all exactly concentric in the field of the eye-piece ; the field of the flat the mirror the reflection of the tube the reflection of the flat and in the middle of all the reflection of your own eye.
technology medicine science
Pages
29
Published in
India
SARF Document ID
sarf.120325
Segment Pages Author Actions
Frontmatter
i-ii C.T. Letton view
Report of the Meeting of the Society held on Tuesday 24th June 1913
223-228 C.T. Letton view
On the Construction of a Cheap Telescope
228-232 H.G. Tonikins view
Sketches of Jupiter
232-233 J. Mitchell view
Observations with a 5” Cooke Refractor
233-234 J. Mitchell view
Meteor Observed by Revd. C. Stewart
235-235 C.T. Letton view
Extracts from Publications
236-236 C.T. Letton view
Memoranda for Observers
237-241 C.T. Letton view
Notices of the Society
241-243 C.T. Letton view
Officers and Council
244-245 C.T. Letton view

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