Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

Photographs of Nebulæ and Clusters, Made with the Crossley ReflectorWhen Professor Keeler entered upon the duties of...
Dhs. 24.97 AED
Dhs. 49.96 AED
Dhs. 24.97 AED
SKU: gb-36470-ebook
Product Type: Books
Please hurry! Only 10000 left in stock
Author: Keeler, James Edward,1857-1900
Format: eBook
Language: English
Subtotal: Dhs. 24.97
10 customers are viewing this product
Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

Dhs. 49.96 Dhs. 24.97

Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

Dhs. 49.96 Dhs. 24.97
Author: Keeler, James Edward,1857-1900
Format: eBook
Language: English

Photographs of Nebulæ and Clusters, Made with the Crossley Reflector

When Professor Keeler entered upon the duties of Director of the Lick Observatory, on June 1, 1898, he planned to devote his observing time for several years to photographing the brighter nebul and star clusters, with the Crossley reflector. The story of his wonderful success with this difficult instrument is familiar to all readers of astronomical literature: this form of telescope was in effect born again; and his contributions to our knowledge of the nebul were epoch-making. Professor Keelers observing programme included one hundred and four subjects. At the time of his lamented death, on August 12, 1900, satisfactory negatives of two-thirds of the selected objects had been secured. The unphotographed objects were mainly those which come into observing position in the unfavorable winter and spring months. The completion of the programme was entrusted to Assistant Astronomer Perrine. The observers were assisted chiefly by Mr. H. K. Palmer, and in smaller degree by Messrs. Joel Stebbins, C. G. Dall, R. H. Curtiss and Sebastian Albrecht. Professor Keelers photographs enabled him to make two discoveries of prime importance, not to mention several that are scarcely secondary to them. ......Buy Now (To Read More)

Product details

Ebook Number: 36470
Author: Keeler, James Edward
Release Date: Jun 19, 2011
Format: eBook
Language: English

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Related Products

Recently Viewed Products