312 Progress of Invention. 



the vibrations of the fork, and the vibrations of the fork being 

 rendered continuous, by means of the impulses derived from the 

 •wheel work. Hands and a dial indicate the velocity of vibrations. 

 The tuning fork constituting the pendulum being connected with 

 that of the apparatus for graphic delineations, and made to corres- 

 pond with it, as to pitch, the dial will tell the number of vibrations 

 made by the tuning fork of the recording apparatus. Tuning forks of 

 various pitch may be used with the horological apparatus, since" 

 their rates of vibrations are not affected by the intensity of the 

 moving power. Or one tuning fork may be regulated to different 

 pitches, by symmetrical and equal weights, which are made to slide 

 along the branches. For small changes, screws fixed in the branches, 

 and moving in and out parallel to the axis of the fork will afford a 

 sufficient power of regulation. 



This instrument enables us to measure very minute intervals of 

 time, to regulate the velocity of the movements communicated to 

 astronomical instruments, and to obtain synchronism between two 

 apparatus, at considerable distances apart, and notwithstanding 

 great variations in the intensity of the motive power, a matter of 

 great importance in telegraphy. 



Application ox Sulphuret of Carbon to the Preparation of 

 Perfumes. — The ordinary tedious, and wasteful mode of obtaining 

 odoriferous principles from flowers, is likely to be superseded by 

 one far more simple. It consists in an application of the affinity 

 which the sulphuretof carbon has for these principles. A flask con- 

 taining the petals of flowers recently gathered, having been filled 

 up with the sulphuret is corked and shaken. It is then left at rest 

 for about six hours, after which, the sulphuret being decanted into a 

 flask containing the petals of similar flowers, it is corked, agitated, 

 and left to rest as before. The same thing- is done with a third and a 

 fourth flask of petals. The sulphuret will then be found deeply 

 coloured, and floating on the water which it has driven out from 

 the pores of the flowers. Having been separated from the water, if 

 the quantity is small, it may be evaporated by mere exposure to the 

 air, and the residue treated with alcohol. Or it may be mixed with 

 oil of sweet almonds, then shaken several times a day for three or 

 four days, and afterwards placed in an open vessel and exposed to 

 the air. If the mixture of sulphuret and oil of sweet almonds is 

 considerable in quantity, it should be distilled at the lowest sufficient 

 temperature, in a water bath. Were the temperature allowed to 

 become too high, some of the sulphuret of carbon would be lost, and 

 some of the aromatic matter destroyed. Equal parts by weights 

 of petals and sulphuret, and a little more than one-third of the 

 weight obtained of the petals oil, are very suitable proportion's. The 

 perfumed oil in this way answers well for every purpose requiring 

 the use of aromatic essences. 



Simple Mode of Gilding Porcelain. — A bright coating of gold, 

 without the ufie of the burnisher, may be produced on porcelain by 

 very simple means. For this purpose two compounds are first to be 

 prepared. The first is formed by dissolving thirty-two parts gold in 

 aqua rcgia formed with equal quantities nitric and hydrochloric acid, 



