420 



THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 



[November, 





Fig.l 



Fig. Z. 



Fig. 2 a. 



FiR. 6. 



Pig. 7. 



ing, owing to its being raised to a high temperature previously to com- 

 bustion at tlie burner. It is intended to use in conjunction with this 

 light the earthenware pipe and conical glasses patented by Mr. Grant, 

 for tlie purpose of causing a more rapid discharge of the vitiated air, 

 and also to diminish the quantity of radiated heat attendant upon the 

 use of metallic pipes. It will be observed from the accompanying 

 diagrams, that not only are the products of combustion completely 

 discharged, but the apartment in which the light is fixed is thoroughly 

 ventilated and kept at any degree of temperature at pleasure. Back 

 draught is avoided by the construction of the external wind-guards, 

 thus insuring an atmosphere at once healthy and under perfect control. 

 It may be as well to state that this mode of lighting is equally appli- 

 cable to a public building or a private apartment, any quantity of 

 light being obtainable from one focal point. 



Description. 

 Fig. 1 ia a front elevation, and fig. 2 a side elevation of this lamp 

 and its appendages. A is a compound burner consisting of three 

 burners on the Argand principle, arranged in one plane, so as to pro- 

 duce one strong column of light, as shown in the separate plan of this 

 part of the apparatus given in fig 3. B B are two tubes, which con- 



duct the gas from the supply-pipe downwards to the jets of the 

 burner. 



C' C- C^ are three bulb-shaped glass chimneys rising one above 

 the other, and resting just below their greatest diameters, on rings 

 D' D- D% which are connected to the supply pipe, E E, which are 

 pend.uit from the roof, and common to all three. A plan of the lowest 

 ring, D ', is given in fig. S. The top of each of the two lower chimneys, 

 C'C , rises a little wav within the chimney immediately above it; 

 the heiglit to which each is so raised being adjustable at pleasure by 

 means of the thumb-screws a a. Within each of the rings, D= and 

 D^ there is an inner ring, F", fig. 4, which encircles and serves to 

 keep steady the tops of the chimneys, C and C=. The top O" the 

 chimney C is also encircled and steadied by a similar ring, F=, which 

 is attached bv radial arms to the funnel G. 



H is a ventilating head, or cap, which is inserted between the 

 ceiling of the room in which the lamp is hung and the floor of the 

 apartment above. It has openings on the under side which corres- 

 pond with similar openings in the fly-plate K. The ornamental face 

 plate is represented in fig. 5. K is the fly-plate, by turning which 

 round, by means of the knob 6, the different apertures are opened or 

 closed, and either wholly or partially, at pleasure. L is a pipe, which 



