General Notices. 299 



very interesting, and shows what profound masters the Gothic architects were, 

 in all that relates to construction. 



Report on A. AT. Per/eins^s Patent Steam Boiler. By Josiah Parkes, Esq., 

 Civil Engineer. 4to, pp. 19, one folding plate. London, 1840. 



Mr. Perkins's improvements being more adapted for engineering purposes 

 than for heating hot-houses, we have only to record the title of the work, as 

 having been sent to us. 



Twenty Years' Experience in Australia, Sfc. Small 8vo, pp. 113, third edition, 



15,000. London, 1840. Price 6d. 



The object of this very cheap tract, the author of which is said to be Dr. 

 Udney, is to " demonstrate the extraordinary advantages of emigration to New 

 South Wales, alike to men of capital and the labouring classes." It also con- 

 tains " facts and observations, showing the present circumstances and prospects 

 of New Zealand," to which colony the author of this tract does not seem fa- 

 vourable. 



MISCELLANEOUS INTELLIGENCE. 



Art. I. General Notices. 



Glazing with Lead instead of Putty, (p. 275.) — In reply to your note re- 

 specting the paragraph on glazing with lead instead of putty, I must premise 

 that "the sides of the sash bars" should have been "the side bars of the 

 sashes." Of course by lead is meant lead lap. The inconveniences attendant 

 on glazing with putty are many; and I need only mention the parting of the 

 putt}' from the wood, even where the roof is kept well painted, and especially 

 those arising from the replacing of broken panes. When the last-mentioned 

 work is to be done, the woodwork is sure to be damaged in cutting out the 

 old putty; and, what is a far greater mischief, the corners of the new pane are 

 chipped off by the glazier, because, unless the glass is of precisely the same 

 thickness, he cannot otherwise insert it underneath the pane above. A con- 

 stant drip is thus secured, and you know what must be the consequences. 

 With lead lap it is otherwise; the lead has merely to be raised, the new pane 

 inserted, and a little of the soft putty or white lead rubbed into the sides, 

 and the work is done. This plan of glazing I have never carried into effect, 

 except in small pieces as specimens of its practicability; but, shortly after I 

 first contrived it, I saw your notice in your volume for 1836 (p. 313.) of 

 Barrett's Nursery at Wakefield, where you mention that a hot-house was 

 glazed in some such manner. I met with Barrett about a year afterwards, and 

 he told me he had not a single " drip" in the house. Mr. Beaton wrote me 

 that such glazing is done at Birmingham, and I presume there will be no dif- 

 ficulty in getting this kind of work executed there. I do not, however, see 

 any necessity for employing any one but a common glazier who has been ac- 

 customed to work what, I believe, is called " church work." My plan would 

 be this. To glaze each row of the slide or sash by itself, putting in the panes in 

 the usual way, to rub in the soft putty used in such work, and carefully close 

 the lead upon the glass, especially where the panes overlap. When the re- 

 quired number of rows to make a sash or slide are finished, they ought to 

 stand a week or two to harden the putty. The sash itself should be precisely 

 like the ordinary one where putty is used, except that the portion or strip of 

 wood which separates the rows of panes must be cut entirely away, or rather 

 never be formed; and, instead of the usual rebate at the sides and top of the 

 sash, a groove should be made (say quarter of an inch deep) to admit the out- 

 side lead lap. The whole must next be well painted. Then take a row of panes, 

 open the outside lap of one of its sides, and insert the closed lap of the row 



X 2 



