340 CARNEGIE INSTITUTION OF WASHINGTON. 



J. G. Lorz, mechanician. Mr. Huff has been engaged chiefly on design 

 and construction of the standard observatory atmospheric-electric 

 apparatus, under Dr. Mauchly's immediate direction, and in making 

 drawings for atmospheric-electric instrument-house at our observa- 

 tories; he was also engaged in special foundry work and in preparing 

 special equipment for the MacMillan Baffin Land Expedition. Mr. 

 Jung has worked chiefly on completion of the sine galvanometer, 

 under Dr. Barnett's direction, and upon construction of standard 

 atmospheric-electric apparatus. Mr. Steiner has been responsible for 

 the greater part of the new and repair work on magnetic instruments 

 and the preparation of field equipments. Mr. Smith has worked 

 chiefly on special mill-work for the Huancayo Observatory, on cabinet 

 and pattern work, and on packing of equipment for shipment. Mr. 

 Lorz, in addition to looking after numerous miscellaneous duties, has 

 worked chiefly on repair work and construction of atmospheric- 

 electric apparatus parts. 



BUILDING AND SITE WORK IN WASHINGTON. 



Numerous details in connection with the purchase, concluded in 

 April 1921, of additional ground to the north of the original site were 

 looked after. The net addition totalled 75,077 square feet. The site 

 now totals 8.76 acres, and is bounded on all sides by existing streets and 

 roads or by lines of proposed streets according to the permanent plan 

 of highways by the District of Columbia. A topographic survey of the 

 extension was made, and various improvements on the site were made. 



Terra-cotta drains were provided to care for rain-water from roof of 

 the Standardizing Magnetic Observatory. An extension, 10 feet by 

 20 feet, was made at the north end of the stable for housing of tools. 

 Three 20-inch, all-copper ventilators were installed on the roof of the 

 Experiment Building, and suitable non-magnetic ducts leading to them 

 were built. Several non-magnetic piers were built in the Experiment 

 Building, as also non-magnetic mounts for galvanometers and acces- 

 sory apparatus were provided in the Standardizing Observatory. 



In conclusion, especial mention must be made of the zealous interest 

 and initiative shown by every member of the Department's personnel 

 who has had any part in the work of the Magnetic Survey Division. 



DIVISION OF EXPERIMENTAL WORK.i 



Throughout the year Dr. Barnett has continued to work chiefly on 

 the investigations which were in progress in 1920, those on magnetiza- 

 tion and rotation and the sine galvanometer. 



Sine galvanometer No. 1 has been completed and installed in the 

 Standardizing Observatory, and all the tests have indicated that it is 

 entirely satisfactory. The manuscript on the instrument is now in 



'From the report of the chief of the division, S. J. Barnett. 



