Art: Metal 
Ceilings 
Are Attractive 
Interiors 
fe) 
“CANTON: 
Metal Art Plates 
are famous for their architectural features. Attract attention everywhere. 
Will not burn, crack or peel. No falling plaster to contend with. Once in 
place needs no repairing. Sanitary, and saves time and trouble. Low cost, 
considering the lasting qualities. Let us tell you more about them. Our beau- 
tiful book, “‘Art in Metal Ceilings,’’ shows the designs. Tell us you’ re interested. 
Ge CANTON STEEL ROOFING CO., Canton, Ohio 
New York Agency, 525 West 23d Street 
@ TO SECURE a prompt response to this announcement we have arranged to 
distribute free of charge 250 beautiful bookcases to the first 250 of our readers who 
answer this advertisement and accept our proposition as explained below. 
Within Reach of All 
HOMES WANDS GAR DENS 
HE cAMERICANA needs no word of praise from us. 
Produced by America’s foremost scholars and experts, 
it stands as an achievement which has already met 
with the enthusiastic approva! of the American people. 
Before ever a line was written for this great work the Jdeal 
was set: A National Work Universal in its Information. 
American in its Production. 
The cAMERICANA is distinctly a national work. It is 
made by Americans. Every section of America has been 
called upon to contribute, and for the first time, in a work 
of universal information, North, South, East and West, 
Canada and South America have had full and true represen- 
tation. 
The -AMERICANA is new from cover to cover—new and 
beautiful type, new maps, new text illustrations, new color 
plates, and, best of all, new and original treatment throughout 
by the foremost American Scholars and Experts. 
‘The -AMERICANA has commanded the services of so 
many educators, scholars and experts as to fully justify its 
title of the one 
Great National Reference Library 
No mere advertisement can convey an adequate idea of the vast interest 
and immense uuliry of the CAMERICANA, or of its exceptional value 
and sumptuous appeasance. We have therefore prepared for distribution 
among thuse interested, a handsome 120-page book containing specimen 
pages, maps, full-page plates, colored plates, portraits of celebrities, photo- 
graphic plates showing the fastest train in the world, the largest steamship 
ever built in America, the famous Flatiron Building, etc., etc. Send us your 
name and address and we will mail you this beautiful and expensive 
book FREE. 
OUR PROPOSITION 
q@ TO THE FIRST 250 PERSONS who answer this advertisement an? Jater 
order the set, we will present absolutely free one of the handsome bookcases shown in 
the illustration above. 
you nothing. 
acceptance of our offer. 
We offer it as a premium for 
It is made especially 
‘This bookease will cost 
THE SCIENTIFIC AMERICAN CLUB 
258 Fifth Avenue, New York City 
to hold the -AMERICANA, and will be an 
ornament to any home. — Fill out the coupon 
cut from this advertisement and mail it to us 
to-day. ull particulars of our offer and our 
handsome 120-page book will be sent you at 
once, postpaid. 
GENTLEMEN:—Please send without cost to me 
sample pages and full particulars of your advertising 
offer with free bookcase. 
February, 1906 
FIFTY SUGGESTIONS FOR 
SHE HOUSE 
27 Determining Sizes in Furnace 
Heating 
I HAVE adopted the plan of measuring right 
around a house. Say a house that would be 
25 feet wide and 4o feet deep would have a 
length round it of 130 feet. If two floors 
are to be heated I would multiply the 130 by 
20, the height of the second story ceiling above 
the first floor, the product of which gives 2,000 
square feet of exposed surface, over which the 
heat generated in the building would be lost. 
I would estimate 20 per cent. of this as glass 
surface and subtract it from 2,600 feet, leay- 
ing 2,080 square feet of wall surface. Divid- 
ing this by 4, assuming that 4 square feet of 
wall would lose as much heat as I square 
foot of glass, I would have 520 square feet of 
equivalent glass surface. Adding this to the 
520 square feet of actual glass surface would 
give me 1,040 square feet of total equivalent 
glass surface. Provide a furnace with a grate 
having an area that would provide 1 square 
inch for every 2 to 3 square feet of equivalent 
glass surface, according to whether the house 
was out in the country exposed to all the winds 
or was in the city sheltered on its colder ex- 
posure. “This would require a furnace having 
a grate of 23 inches diameter for this house, 
and would not be too large to take care of the 
work in severely cold weather.—The Metal 
Worker. 
28. Slate Roofs 
SLATE roofs, which also rank as fireproof, 
are very inferior to those covered with tiles. 
The slates are brittle and, as they are nailed, 
instead of being hung, like tiles, to strips laid 
on the roof, it is difficult to nail them tightly 
enough to prevent them from shaking in high 
winds and breaking off at the nail holes, with- 
out driving the nails occasionally a little too 
tightly and breaking the slate in this way. 
In either case a slate broken at a nail hole 
causes a leak.—T. M. Clarke. 
29. Scientific Housecleaning 
From the fact that living bacteria may b2 
contained in the dust of rooms the method of 
housecleaning is of importance. Great care 
should be exercised to avoid disturbing collec- 
tions of dust on horizontal surfaces. All the 
furniture, woodwork and painted walls should 
be wiped carefully with a dampened cloth, in 
order to remove the dust without causing it to 
rise into the air of the room. “The rugs on the 
floor should be removed from time to time and 
thoroughly dried and cleaned. The floors 
should be waxed and polished before replacing 
the rugs. Special preparations have been per- 
fected for this purpose. These are applied by 
means of a long-handled brush and then rubbed 
into the floor by means of a large burnisher. 
Some of these floor preparations contain tur- 
pentine or other antiseptic substances, and serve 
a useful purpose in addition to preserving the 
quality of the floor—Dr. D. B. Burgey. 
30. Domestic Filtration Unsafe 
A CORRESPONDENT of the New York Times 
writes to denounce domestic, or household, 
filters as unsafe. Far from being a help, they 
are a danger, he claims, whereas municipal 
filters, well managed and with the effluent 
tested daily, or as often as desired, for its bac- 
terial contents, give an efficiency varying from 
ninety-eight per cent. to ninety-nine per cent. 
(plus bacterial). Does a domestic filter re- 
ceive such care? There are filters which give 
