Looking at Yerkes from the outside.

A picture of Yerkes from the air, and a schematic in which all 3 of the domes in the main building as well as the south building itself (with two domes) are identified. Geneva Lake can be seen in the upper left of the photograph.

Another picture of Yerkes from the air, from the other side of the building (and in a different season!). Geneva Lake is behind you in this view.

Here is another picture of Yerkes; the Lake is still behind you.

This is the dome that houses the famous 40-inch refractor, the dome on the left of the picture above. Since this telescope is the largest refractor in the world, it stands to reason that this is one of the biggest domes ever built; the dome itself is 90 feet in diameter and weighs 120 tons. There is a slit in the side of the dome that can be opened to allow the telescope to see out; the slit is 11 feet wide and 85 feet long.

This dome houses a 40-inch reflector, and it is referred to as "the 41-inch" to distinguish it from the 40-inch refractor.

This is the 41-inch again, and if you look closely, you can see that the slit is open. (The researchers working on the 41-inch were preparing to test some instrumentation on the evening this picture was taken.)

This is another picture of the 41-inch with an open slit -- it was taken by one of the researchers on another evening.

A colorful view of the 41-inch dome (taken from the 40-inch dome).

The Observatory has two entrances which boast tremendous architectural detail. Here, as in the above photographs we are continuing to look north. Note the ornate architecture; you can visit another page here that has some close-ups of some of the details.

Similarly, the front door is quite ornate.

This is what Yerkes looks like in the winter. It gets cold -- it's Wisconsin!

To continue the tour, you can either look more closely at the architectural details or go inside the Observatory.


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Content originally generated in March 1995.
This file was last modified on 20 April 1999.