SCIENTIFIC GOSSIP. 



157 



Storm at its 

 height. 



< 



Barometei- falls rapidly, remains stationary for a 



short time, then rises fast. 

 Barometer violently agitated: — 

 Eain in torrents: — sometimes hail: — 

 Wind is highest: — if a short lull occur the storm 



Avill be renewed with greater violence. 

 Wind going W. and NW, 

 Temperatiu'e falls quickly and suddenly: — 



f Barometer rising fast. 

 3. Storm subsides. -^yi^,] j^jg^^ fgj. gome hours:— 



Temperature falls: — 

 <^ Wind getting more to N: — 



Showers of rain and hail; and sometimes lightning 

 flashes in sheets about the dark blue sky: — 

 [_ Clouds pass away, often leaving a starlit sky. 



•JOSEPH GLEDHILL, F.G.S., F.M.S. 



King Cross, Halifax. 



Mtwiiik <^mi\h 



Lime-light for Locomotives. — This is now used with excellent effect 

 on the Pennsylvania Central Eailroad. A jet of gas from a reservoir, 

 mixed with atmospheric air, is supplied by a small pump worked by the 

 engine. The mixed gases are heated in a small coil of tube, before issuing 

 from the jet, and are thrown in a state of ignition on the lime. 



Cleaninj Glass. — A plan useful for many jJ^rposes is recommended 

 as follows: — dilute the ordinary Hydrofluoric Acid as purchased in gutta 

 percha bottles, with 4 or 5 parts water; drop it on a cotton rubber, and 



