INTRODUCTION 



TO THE 



SCIOPTICON CATALOGUE. 



Where to Look for Explanations. 



The Sciopticon Manual (price, in full binding, 75 cents) 

 will be forwarded gratis to purchasers of such apparatus 

 needing explanation as is described therein, to which, 

 therefore, reference may here be made, as follows : 



For operating the Oil Sciopticon, see Manual, p. 33 ; or 

 better, see inside the door of the Sciopticon case, which is 

 usually purchased with the instrument, at the extra cost of 

 three dollars. 



For peculiar arrangements and advantages of the Oil 

 Sciopticou, and of the Gas Sciopticon, and how to secure 

 the fullest advantages of both, see Manual, p. 170, and this 

 Introduction, following. 



For Dissolving Views, see Manual, p. 39 ; Phantasma- 

 goria, p. 45 ; Screen, p. 37 ; Producing Lantern Slides, 

 pp. 61, 135 ; Chemical Experiments, etc., p. 83. 



About Public Entertainments and Descriptive Lectures, 

 see Manual, p. 94 ; and this Introduction, p. xxv. 



For operating the Lime Light, each of the three, see 

 Manual, pp. 152, 153, 155, 162, 163; Adjusting the Jet to 

 the Oil Sciopticon, p. 160 ; Arrangement of Lenses and 

 Distances, p. 164; Dissolving Cock, p. 170; Automatic 

 Cut-off, p. 167 ; Preparation of Oxygen Gas, p. 172 ; Prepa- 

 ration of Hydrogen Gas, p. 174; Pressure Boards, p. 177; 

 Gas Cylinders, p. 178 ; Multum in Parvo, p. 181 ; Gas 

 Microscope, Zentmayer's Arrangement, p. 191 ; Sciopticon 

 Kaleidoscope a Success, p. 197; Lime-light Polariscope, 

 p. 18; Sciopticon Megascope, p. 195. 



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