October 10, 1867. ] 



JOURNAL OF HOBTICULTURE AND COTTAGE GAEDENEB. 



279 



stage, and when not in use hidden by a pot of l\y flat-trained 

 en purpose. 



Fig. 5. 

 vrOODEK TRUNK FOR ADjnSBIOK OF AIR. 



A. Tho boiler. 



B. Cliimney of two-inch screwed pns-pipo loading tlironRb the wnter. 



c. Steam eafoty-pipo opening externally, being of ono-quorter-inch 

 pewter-pipo. 



D. To supply water, kept close. 



E. Two gftS'burnerH in rinffs. One has been sniTicicnt at present. 



F. Tho door to paas in a licht. Thi-^ is a brass screw pluK- Such can 

 be bought at any brasufoumlor's. The centre has been cut out, and a 

 small piece of talc inserted, as it is satisfactory to sec tho light. The 

 door has a cross handle. 



o. Is a circular iMiilitinn to the boiler, and ought to have atlenst Cinches 

 of ground round the bottom 



Then there is the following (tin. 6), patented hy Mr. Clarke. 

 Eagle Foundry, Liverpool. In this the boiler is formed of seven 

 tubes, with a ring of jets of gas beneath. There are seven 



bore pipe being screwed into them. The top one, of course, 

 forms tho flow, and the bottom one the return ; i> Is another 

 box which answers for the return ; i: is a small air-tube ; d tho 

 supply-cistern, which may be placed wherever most convenient, 

 so long as it is above the highest point of the pipes, which 

 should be the box n ; and e is where tho supply-pipe, which 

 need not be more than three-eighths of an inch thick, is gene- 

 rally put in. 



There are four flows and four returns, the surface of which 

 is a little more than two rows of four-inch-bore pipes ; for the 

 circumference of a fonrinchbore pipe is about 111 inches, 

 while that of four one-inch-bore pipes is better that IH inches. 

 Sometimes only three rows are used, and sometimes only two, 

 according to the size of tho house. F Is a sUde for lighting 

 the gaR, which can bo opened and shut at pleasure. There is 

 a tap for drawing the water off at any time, n Is a two-inch 

 sheet-iron tube for carrying off the burnt gas. 



This boiler may stand in the greenhouse and the flue-pipe be 

 taken through the roof, or, what is better, if practicable, put 

 into a cliimney-shaft. The boiler contains about three quarts 

 of water. 



Neither two nor three-inch pipes ought to be used for gas, if 

 economy is to be considered. Supposing for example, the cir- 

 cumference of a three-inch pipe is 'i inches, 1 foot in length 

 would contain fil.H2 cubic inches of water. Now, if we use 

 three one-inch pipes instead of one three-inch pipe, we obtain 

 tho same heating surface, and have only 28.27 cubic inches of 

 water to heat ; consequently a great saving in gas is effected. 

 With this gas boiler one-inch-bore wrought-iron pipes are used, 

 and the frost is kept out of a greenhouse 20 feet long by 15 feet 

 wide for something like 3.<t. 6rf. or l--. per week. 



We have known a lean-to greenhouse 20 feet long, 10 feet 

 wide, and 12 feet high, heated sufficiently to exclude' frost 

 throughout the winter, by a gas stovo 1 foot square, and 3 feet 

 high. The following cut {jUj. 7|, will afford fuller relative in- 

 formation. 



Btnall burners, one fixed exactly under the centre of each tube. 

 The boiler is made of copper, and is 12 inches high by inches 

 in diameter ; and the water-space is between the tubes upon 

 the same principle as in tho locomotive engines. The whole is 

 enclosed in a sheet-iron case just tho shape of the boiler, made 

 to fix on the top, and extending down the side nearly to the 

 bottom. This case confines the heat to the outside of the 

 boiler, and to prevent the cold air getting between this casing 

 and the boiler a flange is fixed. 



In the engraving, \ a are two cast-iron boxes about 9 inches 

 long, and of just sullicieut width aud depth to admit of an inch- 



a. Iron dish S inches deep, always flUed with water hr/or; lightla; the 

 gas. 



6. The cast iron stove. 



c. Tube, 2 inches diameter, extending tho entire length of the green- 

 house, and with its mouth outside to carry olV the noxioos products from 

 the burned gas. 



it. Door for lighting tho gas. 



e. King, lu inches diameter, or gas tubing pierced all ronnd with holes. 



f. Service-pipe, furnished with cock to admit and regitUte tho ad- 

 mission of gas. 



(T. Opening, one on each side, to admit air to the bamin-^ gas, there 

 being no bottom to the stove. 



ORCHARD-HOUSE 



I SENT yon last year some notes on fruit trees in pots ; I have 

 also this year observed the date of ripening of some of the 

 varieties, and the length of time they continued in season. 



Wall fruit has been later this year than last, bat by keeping 



TREES IN POTS. 



the orchard-house closer during the day, and shutting up earlier 

 in the afternoon, the fruit has been quite as early as it was 

 last season. Some of the varieties, both of Peaches and Nec- 

 tarines, have been deficient in colour, although the flavour was 



