June 1945 ET-222 
 
 LIBRARY 
 STATE PLANT BOARD 
 
 United States Department of Agriculture 
 
 Agricultural Research Administration 
 
 Bureau of Entomology and Plant (Quarantine 
 
 MICROSCOPE LAMP 
 
 By Francis Hunger, 
 Division of Fruit Insect Investigations 
 
 Shortages of critical materials have limited the supply of 
 factory-made laboratory equipment. A lamp constructed largely from 
 materials Etlready on hand in the laboratory is here described for the 
 Information of other workers who may be faced with a similar need. The 
 lamp assembly consists of a wooden stand made to support a box holding 
 a straight-sided glass jug containing distilled water. The electric- 
 light bulb is so placed that the light shines through the Jug, producing 
 a working light that is bright, diffused, and cold. 
 
 The following materials are required: 
 
 (l) 150-watt, 110-volt, "reflector-spot" bulbi/ with socket. 
 
 (2} Rectangular glass jug, 1-gallon capacity. 
 
 (3) Two carriage bolts, l/k by 2 inches, with wing nuts 
 
 and several screws; strip metal and small bolts 
 
 for the socket clamp. 
 (U) Lumber as needed for base, uprights, and box: 
 
 One wooden base, 6 by 9 l/k by 3/I+ inches. 
 
 Two wooden uprights, 3 l/2 by 18 by ^/k inches. 
 
 Other lumber for construction of box. 
 
 The assembly of the parts is shown in figure 1. 
 
 The stand is made by fastening the two uprights to the top side of 
 the base» with long screws. The uprights are slotted to accommodate 
 bolts which hold the box for the glass jug. The bolts and the slots 
 make it posslbl«— to adjust the elevation and angle of the light. The 
 bottom and two sides of the box are made of l/2-inch wood. One side is 
 left open, and the side opposite is covered with a piece of l/4-inch 
 ■olywood. A hole 5 inches in diameter is cut in the plywood to allow 
 the light to shine through. Two strips of metal are attached to the 
 box to hold a clamp for the light socket. 
 
 A smaller field of light can be obtained by inserting a cardboard 
 
 shield with a smaller hole between the jug and the plywood. If a blue 
 
 tint in the light is desired, some copper sulfate can be dissolved in 
 the water. 
 
 1/ There are at least two brands of these bxilbs on the market. 
 Its essential feature is a built-in parabolic reflector, which produces 
 an intense beam of light. 
 
UNIVERSITY OF FLORIDA 
 
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 3 1262 09240 8847 
 
 Tlgora 1.— Microscope lanp asseablj. (Drawing made ty 
 J, S. Stlcknej^) The upright on the left has been 
 cut down to show details.