Non-Radioactive Smok Alarms Update Two types of smoke detectors are available for homes, ionization and photoelectric. A recent Raill (May 1978, p. 2) discussed the danger of ionization smoke alarms which contain americium 241, a radioactive material with a halflife of 433 years. Sources selling photoelecni (non-radioactive) smoke detectors have been difficult to locate until we came across this list published in Popular Science {October 1978). - PC Architects of the world have finally taken a step forward in relating to people's values by declaring obsolete the prevailing Charter of Athens, a code of opcration which is a highri e/freeway disintegrated urban approach to architecture. The new Machu-Picchu Charter is a humanistic approach which espouses revitalizing urban areas through citizen participation, historic continuity, integrating the environment, public transportali n, relating the urban to the surrounding region, and responding to human needs. Perhaps we'll begin to see some changes in the ways our cities develop rather than feeling alienated as structures are built that don't relate to people and c mpletely de-humanize our environment and then need to be revitalized. Contact Don McGarth, Jr., Dept. of Urban and Regional Planning, Geo. Washington V., 2023 G St., N.W., Washington, DC 20052 (From A lA J Ollrn al, Sept. 1978, thanks to Sue Tldeman) - LS Alternative Celebrations Catalogue, 4th Edition, 1978, 242 pp., $5 from : Alternatives 1924 East Third Street Bloomington, IN 47401 elebration or SELLebration? Most people will agree celebrations, nce a time of reating and sharing, have been replaced by thoughtle.s consumption. This catalogue is an attcmpt t reverse the trend. It is a resource book filled with suggestions for lifesryle examination, communiry involvement and alternative elebrations f all kinds. A new edition with new possibilities. A good idea is worth repeating. - PC December 1978 RAIN Page 21 PS BUYER'S GUIDE TO PHOTOELECTRIC DETECTORS s...· ~ ............. .... '-., \IwtIJ 1.' PrIce lSI IMIctIIr AOT 75·35 30 'N 1.S-2.0 (b) 75·28 24 AC 1.S-2.0 Ic) -- Edwards 217/217T 31 AC 2.0-4.0 Ic) Gillette lCaptain Kelly) 941 22 AC 1.5 (cl 942 30 12.6V 1.5 (bl Montaomery W"d 838 1590 40 'N 2 (b) 838 1548 40 AC 2 (c) HIS 135' F heat detector Nutone S·185 50 9V 1.5 (b) S-190/191 50 AC 1.5 Ibl Has 135' F heat sensor J.C. Penney 7550 20 AC 1.5 (c) (b) Uses incandescent li",t source Pyrolector (Chloride) 30-77 40 9V 1.5 (b) (c) 30-52/53 30 AC 1.5 Ic) RCA 965001 35 9V 1.5·2.0 (b) Rittenhouse S7665 45 9V 1.5·2.0 (b) S7660/1 38 AC 1.5-2.0 (c) Sears 57042 25 9V I (bl 57043 30 9V I (b) Has 130' r helt sensor 57061 20 AC I Ic) Sylvan.a SO 1001200 30 AC 0.9 (c) Has no test bunon Westin.house 100-7 30 9V 1. 5-2.0 (b) 100·8/9 30 AC \.5·2.0 (c) Notes: n.•. OIta not lIII.lIable from manuf.cturer (.) Rail".. in percent lmOke obscur.tion per '00': see Ie'" (b) Low· banery chirp Ic) POMf·on LED from Popular Science Magazine, Oct. 1978 MushuDlaa Zawadi ., " f..om Alternative Celebrations Catalogue a J 1 I 1 .a 1 J
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