His work in Cambridge is carried on in a large X-ray laboratory and special vault which extends beyond the wall of the main building. These rooms have been constructed in the basement of the new Research Laboratory, and located so that the rest of the laboratory may be protected from the distrubing influence of the high voltage X-ray tubes.

Professor Edwin C. Kemble and Professor John C. Slater, now Lecturer at Harvard, as well as head of the Department of Physics at the Mass. Institute of Technology, specialize in theoretical physics. They have given much attention to the general theory of radiation, as based upon the conceptions of Planck, Bohr, Einstein and others.

On the top floor of the new building a modern radio transmission laboratory for the study of the reflection and refraction of radio waves from the Kennelly-Heaviside layer is now in course of construction. This laboratory will include all the new types of apparatus ordinarily used in such researches and in addition a new type of recording device designed to give continuous records over an extensive period of time.

FEATURES OF NEW UNIT

1. Three laboratories turned into one large, well-equipped, modern unit.

2. 100,000 volt storage battery located in the basement.

3. Three machine shops directly accessible to Research Laboratory.

4. A crystal-controlled master oscillator of 50,000 cycles, with submultiple and harmonic frequency multiplers.

5. Equipment for carrying on experiments on conduction of metals.

6. Apparatus for research in spectroscopy, sound, vacuum-tube phenomena, and electric response of the retina when stimulated by light.

7. Quarters for experiments on gases, and the excitation of atoms and molecules studied largely by spectroscopic method.

8. A 21-foot concave grating, and a special room to house it with a constant temperature for spectra study.

9. A large X-ray laboratory and vault in the basement, located so that the rest of the laboratory may be protected from the disturbing influence of the high-voltage X-ray tubes.

10. A radio transmission laboratory for the study of the reflection and refraction of radio waves from the Kennelly-Heaviside layer, now in the course of construction.