Browse Items (278 total)

Carl O. Lampland's Obituary

Acting Secretary of the Navy Franklin D. Roosevelt's reply to a request by Senator Ashurst at COL's behest for a copy of the American Practical Navigator

Order for a Stereo-Comparator with the Blink-Mikroskop in the largest size

Inquiry regarding description and manufacturer of the Blink-comparator (Carl Zeiss of Jena, Germany - 'Stereo-Komparator')

New pieces of equipment at Lowell Observatory: Photographic objective (Cooke Astro type of lens) and the Blink Comparator

The large Zeiss comparator being kept busy all the time on the examination of star fields taken with the new 13-inch photographic telescope

Zeiss Blink Comparator used at Lowell in the discovery of Pluto in 1930; Request for complete descriptive literature of the instrument in its present form; Microscope objectives (apochromatic lenses) with corrections for colors throughout the…

Visit by the Royal Astronomical Society group to Lowell. Group was very disappointed in not meeting Clyde Tombaugh but did see the pair of discovery plates displayed in the Blink Comparator.

Latest activities in the Lowell Observatory Library to…

In 1911 Lampland suggests the purchase of a Zeiss Blink Comparator to aid in the search for Planet X.

Lampland modifies the apparatus to accommodate larger photographic plates.