This collection primarily consists of letters to Don B. and Murray Skinner from other botanists in California and Washington, D.C. The Skinner's were predominantly interested in cacti and succulents and this is reflected in the letters to them,...
Albert Einstein, Walther Mayer, and Charles St. John at the focus of the 150-foot tower telescope, Mount Wilson Observatory. Einstein is leaning over the eyepiece, at the far left. The three men are inside the observatory dome, and are wearing...
Albert Einstein and Walther Mayer at the focus of the 150-foot tower telescope, Mount Wilson Observatory. Einstein is leaning over the eyepiece of the telescope, Mayer stands at his left. What appears to be an electrical switchboard is seen at the...
Albert Einstein and Walther Mayer at the focus of the 150-foot tower telescope, Mount Wilson Observatory. Einstein is seen leaning over the telescope's eyepiece; Mayer is standing to his left. Both men are wearing coats over their suits. What...
Walther Mayer, Charles St. John, and Albert Einstein at the coelostat at the top of the 150-foot tower telescope, Mount Wilson Observatory. The three men are wearing coats over their suits. The coelostat is in the foreground.
Walther Mayer, Albert Einstein, and Charles St. John at the coelostat at the top of the 150-foot tower telescope, Mount Wilson Observatory. The three men are wearing coats over their suits. The coelostat is in the foreground.
(Left to right): Charles St. John, Ferdinand Ellerman, Albert Einstein, Walther Mayer, and Edwin Hubble on the steps outside the 150-foot tower telescope, Mount Wilson Observatory. The manuscript title at the top of the photograph reads "On Mt....
(Left to right): Albert Einstein, Walther Mayer, Walter Adams, Arthur King, and William Campbell on the footbridge near the 100-inch telescope dome, Mount Wilson Observatory. All of the men are wearing suits; Campbell is wearing a coat over his....
(Left to right): Arthur King, Edwin Hubble, Walther Mayer, Albert Einstein, and Walter Adams on the exterior catwalk of the 100-inch telescope dome, Mount Wilson Observatory. All of the men are wearing suits. Trees are seen in the background.
(Left to right): Albert Einstein, Walther Mayer, and Walter Adams on the catwalk of the 100-inch telescope dome, Mount Wilson Observatory. The three men are wearing suits. The catwalk is the exterior balcony that runs around the outside of the...
(Left to right): Walther Mayer, Albert Einstein, Walter Adams, and Edwin Hubble on the catwalk of the 100-inch telescope dome, Mount Wilson Observatory. All four of the men are wearing suits. Trees are seen on the ground, below the observatory's...
(Left to right, front): Charles St. John, Albert Einstein, Walter Adams, Walther Mayer, (rear): Edwin Hubble, Arthur King, and Alfred Joy in the Monastery Library, Mount Wilson Observatory. The four men in the front row are seated in chairs. All...
(Left to right, front): Charles St. John, Albert Einstein, Walter Adams, Walther Mayer, (rear): Edwin Hubble, Arthur King, and Alfred Joy in the Monastery Library, Mount Wilson Observatory. The four men in the front row are seated in chairs. All...
(Left to right, front): Charles St. John, Albert Einstein, Walter Adams, Walther Mayer, (rear): Edwin Hubble, Arthur King, and Alfred Joy in the Monastery Library, Mount Wilson Observatory. The Monastery served as a dormitory for visiting...
(Left to right): Walther Mayer, Alfred Joy, Albert Einstein, Charles St. John, Walter Adams, Edwin Hubble, and Arthur King on the porch of the Monastery, Mount Wilson Observatory. The Monastery served as a dormitory for visiting scientists. An...
(Left to right): Albert Einstein, Charles St. John, Walter Adams, Edwin Hubble, Arthur King, Walther Mayer, and Alfred Joy on the porch of the Monastery, Mount Wilson Observatory. The Monastery served as a dormitory for visiting scientists. All of...