54 Description of a New Sand-Baih. 



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tion and connection of the sev^eral parts. They are all drawn accu- 

 rately to a scale, so that measurements may be taken. No. 1 is the 

 ground plan. In this plan, a is the furnace. The position of this 

 furnace may also be seen at a in the front efeAjation, fig. 2. The 

 sand-bath as represented here and in fig. 3, is similar to one put 

 up in the New York Free Academy by Prof Wolcott Gibbs; 

 from that one this and several others have been copied. The 

 original however, and all of the other copies were simply sand 

 baths. The lower windows slide up, weiglits being included in 

 the corner pillars; the heat of the- fire passes through the bed 

 plate b 6, fig. 2, heating the sand w^hich lies upon its upper sur- 

 face. All noxious fumes are conveyed away by the ventilator c, 

 fig. 2, which opens into a chimney flue and may be closed or 

 opened at pleasure by the chain d. It is then to this sand bath 

 by Prof. Gibbs, that I have made the additions now to be de- 

 scribed. 



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The furnace a, Is an^ron pot, hned inside with fire brick as 

 usualj except e e^ fig. 1, where is inserted a water-back of large 

 size. This communicates by the pipe/, with the water bath ^. 

 There are two of these pij^s, one above, and one below, as 

 shown at//, in fig 2, through the open door. The front eleva- 

 tion' of the water bath, which is of copper in all its parts, 

 shown at g^ in fig. 2. Each of the doors seen on the front, opens 

 into a separate compartment. The depth of these compartments 

 is shown by the sections h h A, in fig, 1. At f, fig. 2, is a larger 

 compartment, for receiving articles of considerable size. 



At J is a glass tube to show the height of water in the water 

 bath, and at k, a cock placed so low that all of the water con- 

 tained may be drawn off, thus removing any small quantity of 

 sediment which occasionally accumulates. These two parts are 

 seen more clearly at 7 and k^ in fig. 3. 



The furnace is fed through a door at L A moderate fire is 

 sufficient to establish a brisk circulation through the pipes//, and 

 causes the water to boil violently in the water bath, keeping it 

 always fully up to 212^ F. The steam formed escapes through 

 the pipe w, fig. 1, also shown at m m, figs, 2 and 3. At n, figs- 

 2 and 3, is a coupling connecting the copper pipe m^ with a block 

 tin pipe 0, figs. 2 and 3, and worm /?, fig. 1. This w^orm is con- 

 tained in the condenser q, figs. 2 and 3. The distilled water 

 thus produced, escapes at r, figs. 2 and 3, and runs into the re- 

 ceiver s^ beneath. The condenser stands on a shelf over a sink 

 /, figs. 1, 2, and 3^ at the farther end of which is a force pump «*> 

 figs. 1 and 3. A pipe v^ figs I and 3, runs from the top of this 

 pump into the condenser. The pump delivers cold water into 

 the sink in' the common way, but by closhjg t'he cock at w^ fig- 

 3, will throw its stream into the condenser. This water wdieri 

 warm is drawn off at t^e cock ar, figs. 1, 2, and 3. The pip^ 



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