OF DENISON UNIVERSITY 85 



tern always stands ready for projections, and a porte-lumiere in a south 

 window enables one to throw sunlight wherever it may be desired. A 

 beam stretches across the room above for heavy susi)ensions. The other 

 end of the room is provided with laboratory desks. One along the south 

 side of the room is 35 feet long. A wider table runs nearly across the 

 room at right angles to the first Beside this there is a large stone slab sup- 

 ported upon a heavy brick pier, which passes through an opening in ihe 

 floor to the solid rock i 7 feet below. This gives a support for deli- 

 cate instruments that is free from floor-vibrations. From one corner of 

 this large room a photometry room, 12x5, is cut off. This can be made 

 perfectly dark, for measuring the intensity of various sources of light 

 and other optical work. Another small room, 14x8 feet, is connected 

 by an arched space to the large room and can be readily cut off for 

 special work. It contains a stone table set in a corner made by two 24- 

 inch walls for steadiness, a sink and a large fume-cupboard with a tile 

 conduit to the draught-stack, also one or two moveable tables. 



On the second floor are a number of rooms for more advanced 

 work. One (marked "Advanced Physics") 26x17 feet, is furnished 

 with a sink, about 15 gas terminals, electric wires from the dynamo 

 room, a table across one end supported by heavy brackets from the 

 outer brick wall, and a number of very solid moveable tables. A sus- 

 pension beam runs above through the length of the room. This room 

 contains much of the finer apparantus, as the dividing engine, stand- 

 ard meter, various certified standards of electrical resistance, potential, 

 and capacity, standard thermometer, heliostat, reflecting galvonometers, 

 mercury pumps, induction coils, X-ray outfit, saccharimeter, precision 

 balance, etc. A research room opening from it is equipped with water, 

 gas, electricity, stone shelf set in brick walls and a special low-voltage 

 circuit from the battery room. The room marked "Study" (13x1 1 feet) 

 contains also a small department library for advanced students. Oppo- 

 site this is the photographic dark-room of this department. It contains 

 two sinks, gas, electricity and light tight closet. 



In the basement beside the engine and dynamo rooms, there are 

 three rooms, completing the physical equipment. One is a large shop, 

 22x21 feet, for apparatus construction. It is provided with a 3 H. P. 

 electric motor which takes current from the dynamo-room for running 

 the line of shafting, which distributes power to two lathes (one screw- 

 cutting), a circular saw, emery wheel and polishing head. This shop 

 is well stocked with hand tools for both wood and metal work, and a 



