190 On the C(j/} of lUum'itiation by different Kinds of Candles. 



or combuftible matter, which is confumed in a given'timc. Befides which, I have aflumed 

 for the given time the fpace of an hour ; and in order to provide myfelf with a determined 

 point of comparifpn, I have taken that quantity of fuel which is confumed in one hour by 

 burning a wax CEindle, for the given unity as a bafe, and have thus compared the refpeftive 

 lofles in the quantities of combuftible matter, which the other forts of candles fuftain, while 

 burning durijig an equal fpace of. time. The refults of this calculation are, for the fake of 

 bjrevity, placed together in the following table : 



If, in a given time, are confumed of a pure wax candle - - 1000 Pounds : 



There will be confumed during an, equal time of, 



a . , . tallow candle, 6 to a pound - - - . - 1,608 



j§.^^«. ditto 8 ditto . - . - - 1,217 



r ...< ditto moulded, 9 ditto ,- - - - - - 15043 



d. . . candle made according to the 5th experiment - - 1,443 

 e . . . ditto - - - - 6th ditto - - 1,678 



f. . . ditto - - - - ^th ditto - - 2,174 



^!.. .ditto - - - - 8th ditto - - 1,852 



^..r.. ditto . _ - - 5th ditto - - i>739 



i . . . ditto . - - - loth ditto - - 2,008 



k.., ditto - - - - nth ditto - - 2,138 



From thefe refults It Is very manlfeft, that of all candles thofe made of pure and white 

 ■wax burn the longeft, and alfo that fallow candles are the more fparingly confumed, the 

 thinner they are, or the fmaller their diameter is, and that, on the contrary, fpermaceti 

 candles undergo the greateft wafte of fuel ; befides, that they emit more vapours than can- 

 .dles of tallow, although thofe vapours have not a very difagreeable fmell. He therefore, 

 wTio defires to illuminate his room with oeconomy, fhould procure very thin, mould tallow 

 candles, fo that about 12 or 16 of them will go to a pound, and he will find them flill 

 more advantageous, than is (liewn by the above refult ; fince, in it, mould candles of only 

 9 to the pound have been reckoned. But even in that cafe we fuppofe, that in a certain 

 rate of houfe-keeping 100 pounds of tallow candles of the Cze of 6 to a pound are required, 

 the fame illumination may be efteded, according to the experiment here alluded to, with 

 only 64-^- lb. if dipped candles of 9 to a pound be employed. Now the pound of mould 

 candles cods ^gro/Sen * ; confequently 100 pound will coft 20 dollars, 20 grofchen, whereas 

 64I lb. of dipped candles, reckoning the pound at 44- grofchen, will coft no more than to 12 

 dollars 3 grofchen ^\d. fo that in fuch a houfekeeping there is a yearly faving of 8 dollars, 

 \6 grofchen j-^d. which in another upon a larger fcale will come to a confiderable amqijnt. 

 It need not be mentioned, being obvious of Itfelf, that in thinner candles the thickncfs of 

 the wick muft always bear due proportion to the mafs of tallow. 



.» .-,.,■., , . . -K , J 



* The Berlin grofche is equal to 1 4-lSth3 of a penny, or nearly one penny and a farthing EngliHi. The 1 

 grofchen is Aibdivided into 12 pennies, "and one Berlm dollar is worth 2 /hillings 6 2-3ths. pence at par. ' 



4 We 



