It is this: When the heating system is functioning at a uniform rate, that is when, in a given time, the radiators dissipate exactly the same quantity of heat that is delivered to the water in the heater, and when, consequently, the water in the system is circulating with a uniform velocity, the friction head in every circuit leading from the heater to a radiator and back again must be exactly equal to the pressure head for that particular radiator, i.e., to the pressure head which tends to make the water flow from the heater to that radiator and back again, along the circuit referred to previously.

' JOI MISSION STREET SAN FRANCISCO *5 BRANCHES IN PACIFIC COAST CITIES FACTORIES IN SAN FRANCtiCO, LOS ANGELES AND PORTLAND 1 Distributors of Vaspar on the Pacific Coast PAINT Sfgflfl VARNISHES PIONEER WHITE LEAD 76 years' experience--your assurance of Fuller quality pendicitis. or .mone?

CONVEYOR PIPES The conveyor pipes leading from the hoods to the fan and thence to the collector are commonly made of galvanized iron, the gage of which varies from No. 24 to 14, depending upon the diameter.

COLLECTORS For most systems, the nominal size and number of. the collector will be the same as the diameter in inches of the main pipe leading to it.

SECTION II HAZARDOUS COMPONENTS OF MIXTURES COMPONENT Carbon Black Lead Compounds Mineral Oil (0-0.6*) (0 - 4%) (0-0.5*) THRESHOLD % LIMIT VALUE COMPONENT V.

If it were certain that the pipe size for Section 4-1 could be the same as that for Section 1-B the pipe line from 4 to B could be called one section; since it is impossible to know in advance what the pipe sizes leading to and from the radiator must be, it is best to make the radiator the division point of two sections. 2.

fONEESrWHlTE LEAD ,,.. rut !!

If it is attempted to remove heavy dust such as lead oxides by an overhead hood the conditions may be worse than, if no exhaust were used at all, owing to the rising air current carrying the dust up through the breathing zones.

However, sin c e ta lk in g w ith you, we have been m aking some ro u g h c a l c u l a t i o n s , and f in d t h a t in the v e h ic u la r tu n n el w ith th e v e n tila tio n as proposed by F ie ld n e r, which is considered a b so lu te ly e s s e n tia l to avoid the dangers of carbon m onoxide, a n a n w i l l ta k e in to h is lu n g s a p p ro x im a te ly 1Jz n ilo g ran o f lead in the four hours th a t F ieldner c a lc u la te s as a maximum le n g th o f tim e h e should spend in t h e tu n n e l.

Joe Lead for a $1000.

Cause (4) requires that leads he taken from crankpin and crosshead bearings for checking clearances.

Iron (cast) .......................................... 2450 Iron (wrought) ............... 2912 Lead ..................................................... 608 Platinum ............................................. 3080 Silver (pure) ..................................... 1873 Steel ..................................................... 2500 Tin........................................................ 446 Zinc ..................................................... 680

Selikoff, considered the leading health authority on as bestos, has long warned of the danger of lung cancer.

aid Realty and Personal ^allas Detroit Shite lead Torks last Poston Rouston iiinneapolla HeiJark Oakland 03AM Co Coffsyrlll# 0 S A M CO Magdalena Ohio Doaestio Corporation 1.773.17' 2,264.92'/ Ji;03S:09 ~ 457 .=3' 1,192.79s 12,402.54' 22,304.36^ 720.26' 1,255.74' 254.03 2,517.88/ 4;51.6l< 1,366.31/ 1,297.10/ 11.844.13/' 6o,5cai.7T^ 0007-SWP-000017519A STABSMKBT OF FSFPAID IBSUHASCF ACCOOHIS IVota Sopt. 1, 1924 to Jon. 31, 1930.

e inhalation of asbestos is far more dangerous than is generally recognized by the public, ",ce even a transient period of exposure can lead to disease (interstitial fibrosis of the lung, cancer, mesothelioma, endothelioma of the pleura and the peritoneum, painful dermal 'rest md death many years later.