i September 7, 1929 ur, A.

Minutes of Regular Meeting of the Board of Directors of National Lead Company held at No.

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206 DRUGS, OILS AND PAINTS '] 7 ( '\/,v i U / W HEREAS, Experience has taught the m anufacturers o f lead and p ain ts that the use of w hite lead under proper conditions is not detrim ental to health ; therefore, be it R E SO L V E D , T hat the N a tion al P aint, Oil and V arnish A sso c ia tio n , in con v en tio n a t A tla n tic C ity.

ma n a g e r s ' r e p o r t TO THE STOCKHOLDERS OF THE LOWE BROTHERS COMPANY ******* Tbe Management herewith submits to President Lowe and the other stockholders its annual report covering some of the more important events during the fiscal year of 1927.

& Why black is not considered most efficient for walls and ceiling ofX-Ray developing room npHE opinion has been expressed JL that "the-business of a dark room is to be dark"; that "every surface of a dark room should be black and lustreless. " Butshould it?

Ci.7 0 ^ LOT CODE l< Y--795-D PKG 3 P> STANDARD 8*2 TIME.

A TEST OF THE CONDUCTIVITY OF WINDOW SHADES By John R.

Roll of Membership NEILER, Samuel G. (1898).

American Society of Heating and Ventilating Engineers Guide, 1926-27 Freedom from other injurious substances is ninth, not because this might not be of more importance but because these substances are met with so seldom in ordinary ventilating practice and must be practically eliminated in any case.

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Total B.t.u. per hr. 15062 15960 16859 17758 18656 900 225 396 American Society of Heating and Ventilating Engineers Guide, 1928 Total B.t.u. per hr. 823 1313 1810 2304 2798 493 246 CM SO O' CM Os 00 l" SO CM t"* CM C-.

American Society of Heating and Ventilating Engineers Guide, 1929 .

American Society of Heating and Ventilating Engineers Guide, 1929 Tables 1 and 2 are based on the house being of ordinary sound con struction and tightly glazed with double thick glass.

American Society of Heating and Ventilating Engineers Guide, 1929 9.