Pullified the Laji Day of every Month t 

 tPRICE tVyO SHILLINGS.] 



THE 



PHILOSOPHICAL MAGAZINE. 



N U M B E R XV. 

 AUGUST 1799. 



ILLtrSTBATED WrTH 



THE FOLLOWING ENGRAVINGS BY MH. LOWRy. 



J, Mr. MUsttET's Pyronaeter for afcertaining the Heat of zm 

 AfTay-furn^ce. 



2. Von Hauch's Kew Difcharging Elcaromcter, laid before t)tc 



Royal Socitty of Copenhagen-. Afld, 



3. HtTM bolt's Portable Barometer for Tr^vellers>, &c. 



L ONDO.\.- 



PRiMTEB BY J, DAVIS, CHANCERY. LAN t > 



FOR A. tilloch: 



And folil by Mcflrs. Rich^ardsok, ComVill; Cadill and DArifs. 



Strand; D.bhett, Piccadilly; Svmonos, Patcrnortei-rovr; 



Murray and Highley, No. 32, flcet-ftrect; Beli^ 



No. 14S, Oxford ItreetjVzRNoa «nd Hood, Poultrj-j 



HAiiDiNC, No .?6, St. JamtsVftrtet) Westley, 



No, 159, Strand; J. Rimnant, High.ftreef, 



JBlypmfljury J W, Gii.EbRTand AacHEf, 



Dublin i and W, Reunamt, 



Hambuigb, 



