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Substitute for white lead, &c.
088
_3Iechanics, Phgsics, and Chemlsh'g. Substitute for Wldte Lead, (~'c.
M. Leclaire exhibited to the Academy, several specimens of painting, intended to show the advantages which colors with a zinc base possess over those whose base is lead or copper. The first, after being exposed to the action of sulphuretted hydrogen, preserved their lustre completely, while the others were all more or less altered. The dangers to which the workmen who prepare them are exposed, or those even who employ only white lead, caused the white of zinc to be thought of long ago as a substitute ; but besides the fact that there were no establishments in which this prodrtct was manufactured npon a large scale, and by an economical process, there remained another cause of unhealthiness in the necessity of employing oil prepared with litharge, as a drying oil, as well for the zinc as for the lead. hi. Leclaire has got rid of this last cause of danger, by the discovery of a drying medium, whose base is manganese, the employment of which presents no inconvenience. In painting houses, white lead is not the only poisonous material which is used ; several other colors of lead and copper base are still generally employed. M. Leelaire has succeeded in replacing them by colors with zinc as the base, the use of which has not, up to the present time, appeared to injure the health of the workmen. Comptes ReMus de l'Aeademie des Sciences, Jan. 24, 1848.
FRANKLIN
INSTITUTE.
3Ionthlff 211eeling, ]Plarch I6/h, 1848. 5IR. OR.~.N COLTO~cpresiding. The fi)llowing donations were announced : From Hen. Joseph R. Ingersoll, H. R . - Message of the President of the United Stales to the two Houses of Congress, at the comme~meu~ep.t of the first session of the 30tll Congress. Washington, 1847. From IIon. James D. Westcott, Jr., S e n - Report of the Committee on Pate,~ts, (Senate:) No. 50. From Col. S. H. Lot:g, U. S. Top. E n g . ~ The relative cost of Steam and Water Power; the Illinois Coal Field; and the advantages offered by the West, particularly on the lower Ohio, for Manufacttlring. Louisville, Kentucky, 18t8. From the Massachusetts Charitable Mechanics' Association of Boston Exhibition of the Massachusetts Charitable Mechanics' Association, at Faneuil and Quincey [I;.~lls~ in the city of Boston, September, 1847. Bostotl, 1848. From lion. Thomas H. Forsyth, Esq., Senate, P e n n s y l v a n i a - Communication from Ihe Auditor General, relative to the Banks and Savings Institutions of the Commonwealth. tIarrisburg, 1848. Tabular Statement relative to the State F a x on real and personal property, and to Common Schools. ttarrisl:urg, lS48.
_3Iechanics, Phgsics, and Chemlsh'g. Substitute for Wldte Lead, (~'c.
M. Leclaire exhibited to the Academy, several specimens of painting, intended to show the advantages which colors with a zinc base possess over those whose base is lead or copper. The first, after being exposed to the action of sulphuretted hydrogen, preserved their lustre completely, while the others were all more or less altered. The dangers to which the workmen who prepare them are exposed, or those even who employ only white lead, caused the white of zinc to be thought of long ago as a substitute ; but besides the fact that there were no establishments in which this prodrtct was manufactured npon a large scale, and by an economical process, there remained another cause of unhealthiness in the necessity of employing oil prepared with litharge, as a drying oil, as well for the zinc as for the lead. hi. Leclaire has got rid of this last cause of danger, by the discovery of a drying medium, whose base is manganese, the employment of which presents no inconvenience. In painting houses, white lead is not the only poisonous material which is used ; several other colors of lead and copper base are still generally employed. M. Leelaire has succeeded in replacing them by colors with zinc as the base, the use of which has not, up to the present time, appeared to injure the health of the workmen. Comptes ReMus de l'Aeademie des Sciences, Jan. 24, 1848.
FRANKLIN
INSTITUTE.
3Ionthlff 211eeling, ]Plarch I6/h, 1848. 5IR. OR.~.N COLTO~cpresiding. The fi)llowing donations were announced : From Hen. Joseph R. Ingersoll, H. R . - Message of the President of the United Stales to the two Houses of Congress, at the comme~meu~ep.t of the first session of the 30tll Congress. Washington, 1847. From IIon. James D. Westcott, Jr., S e n - Report of the Committee on Pate,~ts, (Senate:) No. 50. From Col. S. H. Lot:g, U. S. Top. E n g . ~ The relative cost of Steam and Water Power; the Illinois Coal Field; and the advantages offered by the West, particularly on the lower Ohio, for Manufacttlring. Louisville, Kentucky, 18t8. From the Massachusetts Charitable Mechanics' Association of Boston Exhibition of the Massachusetts Charitable Mechanics' Association, at Faneuil and Quincey [I;.~lls~ in the city of Boston, September, 1847. Bostotl, 1848. From lion. Thomas H. Forsyth, Esq., Senate, P e n n s y l v a n i a - Communication from Ihe Auditor General, relative to the Banks and Savings Institutions of the Commonwealth. tIarrisburg, 1848. Tabular Statement relative to the State F a x on real and personal property, and to Common Schools. ttarrisl:urg, lS48.