Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 622
Fig. 3. PERFECT GAS-TIGHT, CAST-IRON HEATING FURNACE. … Fig. 2. PERFECT GAS-TIGHT, HEATING FURNACEPortable Style The Perfect has been subjected tosevere tests since 1882. It has been foundefficient even under long and trying so/i.coal tests, and we are satisfied, after ourfifty-two years of furnace experience, thafthe Perfect is the most powerful…
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