SCIENTIFIC NEWS, 133 



SCIENTIFIC NEWS. 

 Improvement on Lamps. 



l\ VERY great improvement in the conftru&ion of lamps New lamp of 



and reflectors, has been lately made by Mr. Nicholas Paul Mr * N * Pau1, 



of Geneva, who in conjunction with Mr. Smethurft, an 



eminent lamp contractor has lately made a public experiment, 



by illuminating the upper part of New Bond Street. 



. Fifteen only of the new lamps with reflectors, were fub- 



ftituted in place of more than double that number of common 



ones ; the effect of which was, that the ftreet was enlightened 



with at leaft twice the ufual quantity of light. 



This effect is produced, not by the combuftion of an extra 

 quantity of oil, but by the fcientiflc conduction of the ap- 

 paratus ; the lamp being formed upon the principles of the 

 beft air furnace ; fo that the whole of the combuftible material 

 employed, is converted into light and heat, without fmoke ; 

 and that portion of light which would have afcended and been 

 loft, is diftributed to thofe fituations where it is required, by 

 means of reflectors fo formed as to diftribute the fame uniformly 

 over the illuminated fpace, and to obliterate the fhadow that 

 would be formed by the body of the lamp. 



Thefe lamps and reflectors are not merely adapted to light- 

 ing the public ftreets, but by various modifications, are ac- 

 commodated to every circumftance where lamps or candles 

 can be made ufe of*. 



Improvement on the Mode of Watching Cities. 



Samuel Day, Efq. of Charter-houfe, Hinton, in r Somerfet- Mr. Day's 

 (hire, in the commiflion of the peace for the county, has directed watchman'* re- 

 his attention to the application of a mechanical check upon 

 the diligence and precifion of watchmen, labourers, and all 

 other clafles of men, whofe duty requires that they mould at- 

 tend at certain places at appointed times. His own account 

 of this interefting arrangement is as follows f. 



* I have received the above from Mr. Paul, but expect to give 

 a fuller account from my own examination, in our next Number. 



W.N. 



f From a printed paper with which he has favoured me. W» N« 



From 



