Sending Robert Main's certificate for JH's signature.
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Sending Robert Main's certificate for JH's signature.
Please accept his thanks for his article on telescopes. Comments on JH's views. Would like 50 copies of the article to distribute to opticians.
Sending him his first photograph of the sun's spot. Has caused a lot of preparation. Comments on various points.
Gives diameter of the sun's image. Used an ordinary eye-piece. There must be some mistake about the penumbra. It is possible now to take daily records of the surface of the sun.
Is pleased that JH likes his plates of Mars. Has a great collection of drawings of Mars but only a few of Venus. Hopes by the Spring to have the photoheliograph working. Has just completed his volume on the eclipse for 1860.
Regarding the pictures of the moon by M. M. Gussew. Gives details of the eclipse of 1860. Heliograph has been working at his observatory since February. G. Sabler has now left and will doubtless do good work when he receives his instrument from J. H. Dallmeyer.
Thinks it possible that a letter he wrote to Charles Pritchard may have been passed to JH. Thinks there is some substance in James Nasmyth's claim on seeing 'Willow leaves' on the surface of the sun.
Regarding the solar photographs. They are not magnified originals but taken direct. Comments on these photographs. Has had correspondence with W. R. Dawes regarding the 'willow leaves' of James Nasmyth.
Agrees with him that J. Müller's drawings do not show the entities around the sunspot clearly. Has nearly completed the apparatus for holding one of JH's sun prisms to his reflector. Hopes to do something with it soon.
Appreciates the difference between Robert Hooke's and JH's suggestions for a helioscopic telescope. Comments on these suggestions. Has recently constructed a reflecting prism. Comments on this.
Was not the person who sent him some photographs of the sun. Was glad the Astronomical Soiree was well spoken of. James Nasmyth was conspicuous and is pleased he was mentioned in JH's Outlines Astr.
Encloses a letter from William Simms, which contains a suggestion for JH's reflecting prism. Inclines to the view that a reflector is not the most suitable instrument for sun observations.
Sending the tracing again with a few additions. Comments on this and the one sent yesterday.
Sending a photograph of the moon 38" in diameter. Begs him to accept it as a mark of appreciation.
Has just returned from a short tour of Russia. Visited Pulkowa and Nijny Novgorod. Had difficulties with couriers. JH's suggestion for a rotating disc with slit to reduce sunlight sounds feasible. Weather was unsuitable at Pulkowa for any observations.
Has just received JH's 'Catalogue of Nebulae.' Has placed his skeleton tube in the cradle of his equatorial. Comments on this and gives sketches.
Encloses a letter from Angelo Secchi. Sent him a Herschelian eye piece and is having a prism prepared for him. Secchi has seen James Nasmyth's 'willow leaves.'
Has received a letter from Angelo Secchi who states that he has seen James Nasmyth's 'willow leaves.' Remainder of letter relates to the JH prism, which he sent him through Cardinal N. P. S. Wiseman.
Would JH look through the proof of WD's speech on the presentation of a [R.A.S.] medal to Professor G. P. Bond and make any comments or suggestions.
Encloses two certificates and hopes that he will give the candidates his support. Has just received a letter from Angelo Secchi on the Herschelian prism.