CH. IX] 



HIGH POWER MICRO-PROJECTION 



275 



mately parallel (fig. 1536), and by slight adjustments of the sub- 

 stage condenser brilliant images are produced. 



FIG. 152. MICROSCOPE FOR PROJECTION AND FOR DRAWING. 



W i The negative supply wire from the outlet box (fig. 3). 



W + I The positive supply wire from the outlet box. 



S Double-pole, knife switch. 



W 2 Wire from the switch to the binding post of the lower carbon. 



W + 2 Wire from the knife switch to the rheostat. 



W + 3 Wire from the rheostat to the upper carbon (+ // C). 



ri, r2 The two binding posts of the rheostat. 



Rheostat The controlling device for the current. 



ILC Incandescent lamp cord. 



Inc. Lamp The incandescent lamp with a wire lamp guard. 



This lamp is for use in working about the projection apparatus. It is con- 

 nected to the supply wires at their connection with the switch so that the 

 incandescent lamp will burn whether the knife switch is open or closed (sec also 

 fig. 2, 4). 



Radiant The arc lamp. 



S-\-, S The set screws for the carbons. 



HC, VC The horizontal or upper and the vertical or lower carbons. 



Condenser The triple-lens condenser with water-cell in the parallel beam 

 between the two plano-convex lenses. 



Axis, Axis The optic axis of the condenser and the microscope. 



Substage Condenser The achromatic condenser under the stage of the 

 microscope. 



P L The concave lens for making parallel the converging light from the 

 large condenser before it enters the substage condenser. 



St Stage of the microscope. 



Objective The projection objective. 



Ocular The ocular of the microscope used in projection. 



Af 2 The mirror or prism placed just beyond the ocular when it is desired 

 to reflect the light downward. 



Screen Image The image projected upon the white screen by the projection 

 microscope. 



