EXPERIMENT STATION BULLETINS. 185 



It was not possible to have the posts fall vertically as they would come 

 ill the middle of the walks. 



The glass used for covering the houses was 10 x 12 double strength. 

 The first cost is less, and in case of breakage the repairs will be consider- 

 ably less than if a larger size is used. Under some conditions it would be 

 well to have the glass 12 x 18 or even larger, but under all ordinary circum- 

 stances it will not be wise to use smaller than 10 x 12 glass or to have the 

 sash bars less than twelve inches apart. 



In the experiments in glazing, a number of methods were employed, and 

 various kinds of glazing points and other materials were used. Two sec- 

 tions containing 100 sq. ft. of glass each, were put in with Gasser's glazing- 

 strips between the panes. This is a strip of zinc a half inch wide and of a 

 length equal to the distance between the sash-bars. They are manufactured 

 and sold by J. M. Gasser, Euclid Avenue, Cleveland, Ohio. They are bent 

 something like the letter Z and are placed between the panes with one 

 edge under the upper pane and the other over the under one, 



A thin layer of lead putty was placed between 

 the strip and the glass. This served to cement 

 the glass to the zinc and made a joint both air 

 and water tight. The glass is certainly more 

 firm than when lapped in the usual manner, and 

 although we have not tested it, we believe it 

 will be less easily broken. 

 (Fict. 6— Gasser's Glazing stHp.) There is iio danger of the glass slipping 

 down, as often happens in a neglected roof, and if the panes become cracked 

 they are less likely to drop out than when glazed in the usual way. It takes 

 little if any longer to glaze by this method, than to lap the glass, and 

 repairs are made with equal ease. The 12-inch strips cost $2.50 per 1,000, 

 and so far as the roof itself is concerned it will be found a profitable invest- 

 ment. The one drawback to be considered is that the strips shut out some 

 of the light amounting to 3 per cent, when the panes are ten inches long, 

 and 2 per cent, when eighteen inches. 



For most work this will hardly be appreciable, but when every square 

 inch of glass possible is desired, as in the forcing of roses, this loss 

 is a decided objection. On the other hand the roof will be tighter than 

 it can possibly be made with lapped glass, so that the use of the strips will 

 lessen the consumption of coal, and the draft of air on plants. 



BUTTED GLASS. 



An equal space was covered with glass butted together, no strips between 

 the panes being used. Beginning at the bottom a pane was laid and 

 securely fastened. A thin layer of lead putty was then applied to the 

 lower edge of the next pane and this was firmly pressed against the edge 

 of the pane below, pushing out all putty that was not required to fill the 

 irregularities in the edges of the panes. They were thus cemented 

 together by a thin film of white lead putty, making in reality one solid 

 pane in each row. The house has now been in use one winter and we have 

 not been able to find even a pin hole through which water or air can pass. 

 We find in this method all of the good points mentioned for the zinc strip 

 glazing, and in addition the cost of the strip is saved, while there is no loss 

 of light, which was the principal objection to the use of the strips. 



The resetting in case of breakage can be performed fully as easily as in 

 any other method of glazing, the only things required for a perfect job 

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