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Frttral Regtutdr*'' Voi. 45, No. 179 / Friday.

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AMERICAN SMELTING AND REPINING COMPANY C6NTPAL RESEARCH LA80RATOI 6S SOUTH Plainfield.

From Asbestos to Zinc, Roofing for Historic Buildings, National Park Service ROOFIMG FOR HISTORIC BUILDIMG5 Asbestos-Cement Shingles In the United States, mechanized production of asbestos-cement shingles began in the first decades of the 20th century, following Austrian Ludwig Hatschek's invention of a process in 1900 to manufacture rolled and pressed asbestos-cement sheets.

1 ,The Senior Inspector of Utnec, -Ices Departnent XALfiQCRLIS*------''* .Aa Port fTcdlaad, 21/1/19^* ros Australian Blue Aabeotoa-gtv Ltd.- fflttenocn* with reference to Aset District Inspector ^oxton'e report of iota January on the ventilation survey Bade at nittanooa during N'ovenber - December 1903, I would like to raise one natter for cone guidance* Inspector Doxton hga referred to tha directive received fran Sydney t&mt all otope developaent cork la tbs lower sections of the nine van to be curtailed for the tine being* This type of head-office ruling has always presented to us our aost difficult problea of achieving conpany co-operation* Too nany plana which we have agreed to with tbe Ulne Manager have later been abandoned by tbe contend of ocoe senior company official; and one to when we have so direct ooceee* As tble latest directive, if still in force* lo contrary to the agroeneat you , synelf, and tbe manager oaee to a<ao tine age X suggest that on tbe oceaslea of ay next visit to Ultteaoen I leave instructions that no steplag of say dSoorlptlon la to be atteapted batesan tbe Bo*s 6 and 9 levels until tbe stops drives in tbe particular area have been ecnpleted and eaa ensure a satis factory supply of through ventilation* My reasons for this Instruction sill bs based upon tbe known toxic nature of tbs sins dust; tbs knowledge gained through past experleaes that high dust concentrations are always associated with those stopes into which secondary ventilation is* or should bs* introduced; and as an additional safety sassure In providing an alternative neens cf aceeos* Although Bogn 1b9 does cover this aspect I consider tbat as it involves a question of ventilation* any challenge to ay request ahould be directed through you as par Sags 136 * 137* on tho other hand Begn 73 provides for such a decision to bo mads by tbe Ulnlotcr preauaeably on tbe advice of an Inspector* I would appreciate your consents on this natter* DISTRICT PT3TOCTOB OP mm .PORT HEPLATO C 4475 j ) i> -

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The Metropolitan Story The Health and Welfare Work of The Metropolitan Life Insurance Company, New York By LOUIS I.

372 OCCUPATIONAL TUMORS AND ALLIED DISEASES Central Europe.

December 1, 1900 ;ir. iSdward K.

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