Ntw Palenle and Mechanical Invenlions. 



1S23.] 



each, to which alembics are adapted. 

 He then saturates the oil with chlorine 

 gas, by passing a stream of the saij 

 gas from the alenibit:3 tlirough tlie oil. 

 This process must be very carefully 

 watched, and must be stopped as soon 

 as the saturation is complete, and tho 

 oil has imbibed or absorbed a sufficient 

 quantity of the chlorine, which is 

 ascertained as follows, 'i'he appear- 

 ance of the oil M ill be changed from 

 the opaque muddy-black colour to a 

 claret-red ; and, instead of the light 

 watery substance of the volatile oils, 

 it will assume a gelable appearance ; 

 and, if tiie weather be very warm 

 during the operation, it may be known 

 by plunging a phial filled with oil, for 

 a minute or two, into a vessel of cold 

 water; the disagreeable empyrcu- 

 matic smell will be greatly diminished, 

 although it cannot be completely over- 

 come without at the same time <iestroy- 

 ing the oleaginous principle ; it is, in 

 fact, changed from a volatile to a 

 fixed oil, without the least injury to its 

 penetrative qualities. 'J'he oil thus 

 prepared is ready for use ; that is to 

 say, for mixing and grinding with the 

 materials or component parts of the 

 coating which is proposed to l>e laid 

 over, or spread upon, tlie substances 

 intended to be preserved. These 

 materials or component parts consist 

 of the following articles, viz. of every 

 one hundred parts thereof he takes 

 fifty parts of white lead, or of the red 

 oxyd (according to the colour re- 

 quired), twenty-live other parts of 

 carbonate of lime, well washed, and 

 the remaining twenty-five parts of 

 carbon of purified coal-tar: these in- 

 gredients are to be mixed with the oil 

 prepared as above stated, in large 

 inash-tubs, and must be sullered to 

 remain twenty-four hours before the 

 process of grinding is commenced, in 

 order to give time for the slight efier- 

 vescence which takes place, occasion- 

 ed by the escape of carbonic acid gas. 

 The process of grinding and mixing 

 the materials above mentioned with 

 the oil is the same as that which i.s 

 used by oolour-mi'n in preparitig tlieir 

 oil-paints, Vami-ly, that it isgrcjund iis 

 .itilf as jtossible, that a due prr)poYtion 

 of the oil for liquefying the eompnund 

 for use should accompany it; and, in 

 case of two or more; coatings being 

 intendiMl to be laid on when the com- 

 pound is to he applied to timber, the 

 first covering should be laid on very 

 thin, in order that it should imbibe as 

 I 



535 



much of the oil as possible : ti»e fliick 

 coating or coatings intended to follow 

 will prevent any escape of the oil 

 absorbed by the timber. The whole 

 of the ingredients, particularly the 

 carbon of the purified tar, has such an 

 affinity for the oil, that it will require 

 nearly weight for weight in the appli- 

 cation. 



If applied to timber that has been 

 regularly painted for fifty years (which 

 has been ascertained by actual trial), 

 t!ie oil will penetrate to the surfnce of 

 the wood, while the solid parts unite 

 with the oiled paint, which the oil hnd 

 previously rendered soft; and in tiiis 

 st.ige the whole may be easily scraped 

 ofl", or, if suffered to remain, will be- 

 come an impenetrable covering; and 

 in all cases, when it is dry, tlie smell 

 arising therefrom wiil cease. The 

 ntility of this compound, as a preven- 

 tative, is founded on the antiseptic 

 qufjlities of the fluid, and the inde- 

 structibility of the solids. The carbou 

 of refined coal-tar, as prepared by Mr. 

 O. is the same coal-tar still, but 

 changed in appearance, in the same 

 manner that flowers-of-sulphur bear to 

 roll-brimstone. 



Timber thus prepared has been 

 subjected to the most violent test, for 

 the space of two years, withont tlic 

 slightest appearance of change, except 

 that it had assumed a greater degree 

 of hardness. 



In all cases where timbers are 

 scarfed or dove-tailed, or where they 

 are wedged together, without any 

 intervening substance, there is sure to 

 be the commencement of decay, 

 which a (iiick coating of the compound 

 would eft'cctually prevciit, as it stands 

 in all climes, being neither aU'ected by 

 heat or cold. 



When applied to iron, or any other 

 metal, the adhesive power of the 

 compound eti'ectually excludes the 

 operation of oxygen on tlie surface, 

 anil of course; preserves it from decay.. 



Witli respect to its application to 

 canvas, or any other linen substance, 

 it is reconnnendcd to lay on the fir.st 

 coat very thick, whereby tlie inter- 

 stices may be completely closed, and 

 rendered impervious to rain, or any 

 other moisture. — llcpnrlory. No. 2a;{. 



LIST OF PATENTS FOR NEW INVENTIONS- 



Tliomsis Leech, of BliieBoai-coJirt, 



Friclaj -street, London, merchant; for an 



iinprnvpmcril in sfPiini-oiiKiiics, by llio 



ui>plicatiun ot steam inunediatily to a 



hIiccI, 



