Show SCIENTIFIC sd MISCELLANY I It lies has been heen estimated that the com corn combustion bustion bu of or coal voal III In London at nt least half a n million tons tOils of or sulphuric acid Into Inlo tIle tho alt air each elleh year cur and the th t upon uncut certain building stones statues Is disastrous The ILme acid washed down Iown by rains attacks thu th ibm Hmo of ot marbles marbled antI and calcareous form forming ing tog gypsum anti and causing till the surface to swell and crumble A for the tIme decaying stonework Is iii tho the of or solution of ot h which forms brain nn nut hub liv II soluble sol ble sulphate with thai tho and liberates lime which the tho carbonic l lot ot of tho the air converts Into the Original binding cement of ot the stone Referring to mi nil a ui the tl Chapter House at nt Westminster e Prof A U n Church states lilote that earring so liO soft as to lo bu brought away IW by tho the linger wan Willi made sound anti and harder that tho time newly guam quarried ned ried atone The advantage of or the tho magnetite elec rodo lamp the tho carbon arc Jis ns out liv hy O G E are arc r longer life lICe higher a 11 pur nura or if mixed buo blume amid The Tho negative electrode ele from trum which tim tha lump amp Is 15 named Is really raIly n n a mixture of or three metallic oxides emich serving a n part uart In forming farming novel and 1101 source at af Illumination Tho titanium ovide tho the lire arc luminous the oxide oC of Iron gives conductivity when cold nid and the tho oxide of oC chromium too rapid ravid con on consumption The Thc transmission of photographs by telegraph hits hils leached tIme the th of ot practical results and actual seeIng by b wire Is 18 expected to 10 follow soon Korn Jorn reproduces reproduceR at It a uL lI WIce through tho varying electrical el resist resIt resistance r ance anco of ot selenium the tho changing current registering hue tho tights lights and shades of I t successive points In proper rICO place on a II sensitive plate it tl the tho receiving end The or ot Berlin of ot f Nan Natu Nancy cy C transmits photographs by a mu differ different ent and purely mechanical menus means no nn selenium being used while the tha hue tele of ot the time same Inventor Is de tie designed signed to produce an Image of If any II Il Illuminated object or scene ut t tiny any dis distance distance tance It U ts I that tile the problem ot of really seeing by telegraph will be bl solved by bV making time the Images to appear In iii more rapid succession than the tho ret retina retIna ina ma can cnn separate them At present tho the sending apparatus comprises n II cam camera camern camera era ern obscura with a cm lens len and mirror to retied the optical Imago image upon a Il row of or SO tiny cOilS cells anti and a I col collector collector collector lector for tor successively Inserting these thoe cells cell In circuit Tho The receiving station embraces a II highly sensitive galvano galvanometer meter moter with three local focal circuits The Time principal circuit contains time the tor tar nail and n a telegraph relay the primary circuit of ot a n small Induction cell coll has hus In turn tho the second part ot of the tor and nut the secondary circuit of the coil coll has a I gap whose spark controlled l lb by b the tho distributing collector perforates a Il paper with very firma holes heirs equally spaced centers but hut of o size varying to correspond with points on no the Image Tills gives a II picture re me reo autotypy Tho The tho the chief part provides a II local cur current current rent of oC Intensity to register decidedly every ee change In tho feeble current from the tho selenium cells clIs clIsTo To Ta give Ivo the th greatest possible pre pro precision precisIon cislon to our knowledge of oC the atomic weights wel of oC the nn tin International commission corrects tho the list each year In accordance with the tho most recent discoveries Of Ot the 71 70 elements in iii the latest t list hydrogen Is still tIme the lightest with tn fin atomic weight of or lOS The Tho weight ot of oxygen Is 10 gold 1 1572 2 radium indium m 2 and amid uranium the tha heaviest substance 2385 2335 while mercury thallium luau lead bismuth and thorium are arc nil all heavier thAn gold Tho od air spray has hns beon bean for a considerable for ar paint painting log ing largo large surfaced like the low tow lower cr er and for lor whitewashing tunnels Tho The art of oC decorating small surfaces by b means of ot an In airbrush seems to 10 have helVe Its lis development In III Germany Of OC the two hive types 1101 of or ap all apparatus one Is Iii hold 1110 a mu tho tIme Is ined like n a the tile muir for spraying In is supplied from n ii cylinder ot of compressed K oll jilt uh or 01 ear III acid achil gait aK or av In a mm more lIve IIvo way hy lIy a n hand pump It is capable of ot a mm gr grumt at lIt variety variN of ot applications l Tho Iho can bo ho used for fat ordinary Industrial painting by II uny tilt unskilled workman whim an un artist of nC Homo mourn it ability ty iun Cu Ii paint lowers flu we rut unit other designs upon enamel bronze paper anti and oven ovon up upon upon on cloth carpets and other fabrics It 11 linn hl proved specially serviceable In imi ng Among the H for far t lr which a mm l sUil demand a nut flu hums has sprung og up IN hi ii the metal cobalt Thin This ha hll bem only omIt for such sueji 55 H anil the tho un mm nuni ie beon only about ISO frIO I 50 Ion humus It U humus hillS time tho sumac Ninin on an alt riH II nIckel nickol tint but It titus has net been buen for this 1111 lit on tnt account of Us tn tH I nit O t Now i ioro are aro now lining Bought GOuhl an nN n a I supply for tUI built for ter it Il has proven nn 1111 a x Irn itt rt mm mit mu lII I |