84 



General Notices. 



point begins the pipe, of 6 in. bore, laid perfectly level, which will convey 

 the water in any direction whatever, and to every part of the house, if de- 

 sired; and the returning end of this pipe maybe thrown into any part of the 

 boiler near the bottom, saj' 12 in. below the upper aperture ; which 12 in. of 

 fall, it is scarcely necessary to observe, must be given by an elbow in the 

 pipe ; and this elbow may be placed in any part of its course, providing that 

 the architect carefully observes to increase the length of the vertical tubes, 

 hereafter described, should he place any between the elbow and the boiler, 

 in the returning end of the pipe ; that is to say, he must, in all cases, make 

 those tubes as high as the top of the boiler. 



" The pipe may be composed of castings, either flat, square, or round 

 (say in 4 ft. lengths), with an aperture in each, or every other casting, of 

 the same size as the bore of the pipe, or any less aperture, if preferred, 

 with a tube, standing as much above the top of the pipe as the top of the 

 pipe is below that of the boiler, to prevent the water from running over. 

 These apertures give air and motion to the water, and serve, at the same 

 time, to admit any quantity of vapour into every part of the^house. 



" Should the gardener wish, at any time, to give the vines a good steam- 

 ing, by entirely filling the house with vapour, the above plan is well calcu- 

 lated for doing it; and requires nothing more than stopping the supply of 

 water to the boiler, and reducing the surface of water to 2 or 3 in. below 

 the upper aperture in the boiler. He may steam in any way, or in any part 

 of the house he pleases, by keeping such vapour-tubes open or shut as it 

 best suits his purpose." (^Neivton^s Journal for June, p. 125.) 



Oil as a Substitute for Putty between the Laps of Panes of Glass. — Sir, A 

 writer in the last Number of your Magazine, I observe, wants a remedy for the 

 cracking of glass in lap-glazed roofs. Puttying is the old and an effectual 

 mode, but it looks very ill. In a large conservatory which I am at present 

 erecting for myself I am about to fill the laps with a transparent drying 

 oil, put in with a large camel's hair pencil ; which will be held by capillary 

 attraction, while it remains fluid in the same way as the water is which, 

 being frozen, causes the fracture. But the oil will speedily become solid, 

 and will fill up the lap as well if not better than putty ; and it will never be 

 known, on mere inspection, whether they are filled at all or not. It is 

 obvious that this operation must be performed when the glass is perfectly 

 dry. I am, Sir, yours, &c. — Robert Mallet. Ryder Row, Dublin, Sejjt. 23. 

 1830, 



Siebe's neiu-invented Self-pressure Cock. {fig. 10.) — This cock is of a 

 construction different from any hitherto offered to the public, and com- 



10 



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