cover image: Journal of the Asiatic Society of Bengal  Part II.—Physical Science  1875

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Journal of the Asiatic Society of Bengal Part II.—Physical Science 1875

1875

While in the bridge method the balance is obviously independent of the resistance of the receiving instrument in the differential method the balance is clearly a function of the resistances of the two coils of which the receiving instrument consists and as these two coils may altar their resistances independently and not in proportion as indicated by the balance equation a now clement of distu [...]. The apparatus is constructed so that the plane of the sensitive collodioti film shall exactly coincide with that of the focussing screen of the camera and in order to adjust the instrument so as to obtain an image of any dsired portion of the solar limb or disc it is arranged that when the sensitive plate is in the proper position for receiving the first image of the sixty the observer can [...] To facilitate the examination a piece of the film was cut away across the lines in different parts of the plate and the course of the uncovered part of the lino compared with the covered part. [...] The only chance of error I could see in this plan was the sticking of the film to the rough surface of the engraved lines ; but in the cases where the film blistered it was found that the blistering was more marked on the lines than elsewhere and so it would appear that the lines did not exert any particular influence on the free motion of the film. [...] This was due partly to reflection of light from the polished surface of the wood-work of the slide and the brags-work of the under suface of the exposing disc which was partially obviated by covering with dead black varnish all the surfaces capable of reflecting light on to the sensitive plate and partly to the ruby-red glass fixed in the revolving disc not being perfectly impervious to the a
history
Pages
68
Published in
India
SARF Document ID
sarf.120250
Segment Pages Author Actions
IX.—On the General Theory of Duplex Telegraphy. By Louis Schwendler
47-63 unknown view
X.—Photography in Connection with the Observation of the Transit of Venus at Roorkee December 9th (Civil) 1874.—by Captain J. Waterhouse Assistant Surveyor General of India
64-82 unknown view
XI.—Description of New Marine Mollusca from the Indian Ocean. By G. and H. Nevill
83-104 unknown view
XII.—List of Mammalia Collected by the Late Dr. Stoliczka When Attached to the Embassy under Sir D. Forsyth in Kashmir Ladák Eastern Turkestan and Wakhán with Descriptions of New Species.—by W. T. Blanford F. R. S. F. Z. S.
105-112 unknown view
Backmatter
i-ii unknown view

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