The Miceoscope. 



59 



incubator may be constnicted by any tinsmith, as follows: A strong 

 tin box with copper bottom, having a deep indentation on one side, 

 is made (see cut). 



Into the indenture two wooden drawers, each with a bottom 

 capacity for a dozen eggs, are fitted (c c) ; and the whole can encased 

 in wood. Between the tin and the wooden box there should be 

 room enough to pack a considerable amount of cotton or sawdust, to 

 keep the warmth generated, in the can. * The can must be supported 

 on legss everal inches above the bottom of the wooden box in order 

 that a gas lamp may be slipped under it. 



£■ 



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Fig. 1.— Section of Incubator. 

 A— Tin Box; the interior of which is filled with water. 

 B— Indentation with wooden drawers c c, closed by 

 E — Door, which is double, and packed with cotton. 

 D— Cork, perforated by thermometer and regulator. 

 K — Rubber tube from regulator to gas-lamp I. 

 G— Gas supply tube to thermoregulator. 



H — Thermometer, and thermoregulator projecting into water. 

 J— Packing between tin box and wooden casing. 

 K— Outside wooden casing or box. 



The case and can are perforated at one posterior corner by a 

 tin tube which is stopped with a large cork (D), through which pass 

 the thermometer and the thermoregulator — the latter connected by 

 rubber tubes (F. G.) on one side with the gas jet — and on the other 

 with the small lamp below (I. ) 



Probably the best and simplest thermoregulator is that known 

 as "Reicherts." This consists of a thermometer tube filled with 

 mercury — the upper end of which is dilated to receive a glass T- 

 shaped piece, also of glass, into which the gas streams and is conveyed 

 through the rubber tube F. to the lamp below — the amount of gas 

 being I'egulated by a graduated screw. As the temperature 



