A wider use of the technique already available for sue and numbers of an aerosol would not only throw* light on some of the problems of air pol lution but would certainly lead to further improvements in our knowledge of aerosols.

In other words, it would be unreasonable to expect the Bureau to endorse Aroolor or any other S.P. lubricating agent which may be regarded as being safe or relatively safe for the subject purpose as such endorsement would easily lead to complications rela tive to the poeition of competitive manufacturers of such agents.

Jordan, Dear Bobs I certainly agree with you that we should us every effort to dissuade the Standard of Indiana people from shipping concentrated fluid around to their various distributing points* However, your letter does not give very any details and I would appreciate it if you would advise ust how such of this has been going on, why it is necessary, whether the concentrated Ethyl fluid is sent out or whether they over-dope sane quantity of gas oline and if so, how much lead is contained in it.

The resolution of these questions would lead to the answer of the fifth problem

., 2330 Wolfram L , St,Chicago,III..'. ....... 1077 EAGLE-PICHER LEAD CO, THE., American Bldg, Cincinnati 1, Ohio.. 1127 ELECTRIC AIR HEATER CO, 426 .

The following observations concerning the behavior of glass with respect to radiant energy will lead to a better understanding of the.heat-balance relation. ,, Glass transmits, in varying degrees, radiation having wave lengths between au and 4.75 microns.

Bankline Oil Company Barber Oil Corporation Baroid Sales Division (National Lead Company; Bay Refining Corporation Bell Brothers Bell Oil & Gas Company of Delaware Belridge Oil Company Bentex Oil Corporation Berry Asphalt Company of Arkansas Bethlehem Supply Company (Bethlehem Steel Company) Big Chief Drilling Company Bishop Oil Company Blanco Oil Company Bond Oil Corporation Bovaird Supply Company, The Bradford Motor Works Bradley Producing'Corporation Braun & Company, C.

Progressive dyspnea, which can lead to disablement, is the chief symptom.

J-M 85% Mogncsla is the leading in sulation for temperatures to 600F.

XT 10 AC*RaD AS FOUOWSi 3*lir Agree* to eell Arid Buyer agraoa to biy irpon tho folloArsg taratf &ad condition*t 1, jJAT.ifi.Iit {a} Uu*d'id Flue Gsi&so, (b) African Frooeaa Lead Free Zinc Oxide, fccrc&uaft*r s-c-v.*- ri>2r-wi to ne eXi.ac OxicUtu* ?

Ceiling diffusers may also be used, but they may lead to difficulty during the heating season if the warm air . remains at the ceiling, resulting in cold floors.

Elise Comprond and Hr Harold Bavley above establishment on January 27 report our engineers to the so, Aa a rulwee do not recommend recirculating air from a dust collector which has been used to collect dust that my be considered toxic such as asbestos silion or lead However if the dust collector is officient and is properly maintained ruch & system does not neosssarily constitute a besard - - It is deces of the fact that adequate paintenance of the sytem is rarely carried out that we prefer the air to be exhausted outdoors = es the In the man of this plant most practical thing to do would appear to be to go along with the system of recircu- lation of air provided the collector is fitted with a suitable warning device to be activated in case of failure of the filter provided the system is properly mintained

With colloidal silica, small amounts are completely removed; too large amounts lead to instantaneous death; intermediate doses as in the experiments described result in the formation of a complex between silica, fat, and protein. -- Cond. from Bull.Hyg.

Following a report on recent industry advisory committee meetings, particularly those leading to the delay of a sulfuric acid order, members were questioned about the need for advisory committee meetings concerned with various plastic materials.

Heating Unit, Electric: A structure containing one or more heating elements, electrical terminals or leads, electric insulation, ana a frame or casing, all assembled together in one unit.