[DOC] [TLE] Alvan Clark & Sons - Wikipedia [PAR] Alvan Clark & Sons made the 36-inch (910 mm) objective lens for the Lick 
Observatory refractor, shown here in an 1889 drawing. The telescope was 
designed and built by the Warner & Swasey Company. Alvan Clark & Sons was 
an American maker of optics that became famous for crafting lenses for ... The 
Clark firm gained "worldwide fame and distribution", wrote one author on... [DOC] [TLE] alvan clark - AstroSurf [PAR] The 36-inch (910 mm) objective for the Lick Observatory refractor was made in 
1887 and ... Figure 1- Alvan Clark (center) and his sons, Alvan Graham Clark (left
) and ... Figure 3- The 36-inch Lick Observatory refractor (left) and the 40-inch 
Yerkes .... From these tests it appears that the character of the image varies with 
the... [DOC] [TLE] Mt. Hamilton Telescopes: Great Lick 36-inch Refractor [PAR] The 36-inch refractor was fabricated at the same time, and one of the two original 
... into lenses in Massachussetts by Alvan Clark and his son Alvan G. Clark. ... 
Even today, it is second in size only to the 40-inch Yerkes Observatory refractor. 
... to build a "telescope superior to and more powerful than any telescope yet 
made. [DOC] [TLE] The Mentor  The Story of the Lens  Page 12 | glassian [PAR] Alvan G. Clark seated beside the great 40-inch Yerkes lens ... One of these 
mirrors is made of silver on glass, has a diameter of 60 inches and weights nearly 
a... [DOC] [TLE] Golden Era of Refractors (Cosmology: Tools) [PAR] The trick was to combine a concave lens made from a leaded ("flint") glass ... One 
of these was a 9.5-inch telescope at Russia's Dorpat Observatory, installed in 
1824 by F.G. Wilhelm Struve. ... Alvan Clark died at the age of 83 in 1887, the 
same year that the Lick 36-inch refractor was dedicated. ... 40" telescope at 
Yerkes... [DOC] [TLE] Yerkes Observatory - History [PAR] These 42-inch "blanks" could be ground to create a 40-inch refracting telescope, 
... On July 1, George Ellery Hale, a 24-year-old astronomer working in his own 
private ... Nearby sits Alvan G. Clark, the well-known optician from Cambridgeport
, ... using the world's largest refracting telescope, the 36-inch at Lick Observatory. [DOC] [TLE] Twenty-six Inch Uranus - Solar System Observing - Cloudy Nights [PAR] Nov 26, 2006 ... The observatory houses a 26 f/16 Alvan Clark refractor! ... Club members 
operating the scope made Uranus one target for the eveni. ... good look at 2 of 
Alvin Clark and his sons' scopes, the one at the Yerkes(40) and Lick(36). .... 
Viewing through these historic telescopes kicks it up a notch or two, doesn't it? [DOC] [TLE] LCAS - Early History Of The Telescope Part3 [PAR] May 21, 2012 ... Typically, two separate lenses are used for the objective, one of crown glass and 
the other of flint. ... For example, it was with the Lick 36" refractor that E. E. 
Barnard discovered ... Alvan Clark, who made the 40-inch lens, felt that a still 
larger ... But the Yerkes telescope was not the largest refractor ever built. [DOC] [TLE] Alvan Clark Telescope Maker  One Minute Astronomer [PAR] Apr 15, 2008 ... Alvan Clark: Master Telescope Maker. April 15 ... the 36-inch lens at Lick 
Observatory, California (still in use); and the 40-inch lens at Yerkes... [DOC] [TLE] Clark Family | American astronomers and telescope makers ... [PAR] They made the 36-inch (91-centimetre) lens for the Lick Observatory, Mt. 
Hamilton, Calif. ... All these telescopes remain in operation except that at Pulkovo
, which was ... The younger Alvan Clark directed the fabrication of the 40-inch 
lens of the Yerkes ... The 40-inch (1-metre) refractor at Yerkes Observatory, 
Williams Bay. [DOC] [TLE] Alvan Clark & Sons - Harvard College Observatory History in Images [PAR] Alvan Clark (1804-1887), who at the time of this portrait is a portrait painter ... As 
the story goes, this experience, along with hearing how

Question: Alvan Clark made a 36" one of these for the Lick & a 40" one for the Yerkes
Answer: Telescope