F. H. Richardson's bluebook of projection (1935)

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MATHEMATICAL TERMS 709 CENTIGRADE AND FAHRENHEIT SCALES Centigrade Fahrenheit Centigrade Fahrenheit 0 32 50 122 5 41 55 131 10 50 60 140 15 59 65 149 20 68 70 158 25 77 75 167 30 86 80 176 35 95 85 185 38 100.4 90........ 194 40 104 95 203 42 107.6 . 100 212 45 113 MELTING POINT OF MATERIALS Fahrenheit Mercury — 39 Tin 442 Bismuth 507 Lead 617 Zinc .../ 773 Antimony 1,150 Aluminum 1,157 Fahrenheit Bronze 1,692 Silver 1,873 Copper 1,996 Gold 2,016 Cast Iron, Gray 2,786 Steel 2,372 to 2,552 TABLE OF REFLECTION POWERS BY DIFFERENT SURFACES This table should be of value to those selecting theatre interior decorations. The percentages indicate the proportion of the total light falling upon the various surfaces which is reflected. Material Per cent. Polished silver 92 to 93 Mirror silvered on back.. 82 to 88 White blotting paper 82 White cartridge paper.... 80 Polished brass 70 to 75 Mirror backed with Amalgam 70 Ordinary foolscap paper.. 70 Chrome-yellow paper 62 Orange Paper 50 Yellow wall paper 40 Yellow-painted wall 40 Light pink paper 36 Material Per cent. Yellow cardboard 30 Light blue cardboard 25 Brown cardboard 20 Yellow painted wall, dirty. . . 20 Emerald green paper 18 Dark brown paper 13 Vermilion paper 12 Bluish green paper 12 Cobalt blue paper 12 Black paper 5 Ultramarine blue paper 3.5 Black velvet 4