A manual of practical hygiene / by Edmund A. Parkes ; edited by F.S.B. Francois de Chaumont.

Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: A manual of practical hygiene / by Edmund A. Parkes ; edited by F.S.B. Francois de Chaumont. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    221/820 (page 175)
    MEASUREMENT OF CUBIC SPACE. 175- reduce the temperature of the air to standard temperature, as is sometimes done. A deduction must be made, however, for the bodies of persons living in the room; a man of average size takes the place of about 2£ to 4 cubic feet of air (say 3 for the average).* In linear measurement, it is always convenient to measure in feet and decimals of a foot, and not in feet and inches, f If square inches are measured, they may be turned into square feet by multiplying by -007. Eules—Area or Superficies. Area of circle, . Circumference of circle, Diameter of circle, Area of ellipse, . Circumference of ellipse, Area of rectangle, Area of parallelogram, Area of trapezium, = D2x -7854. = C2x -0796. = D x 3-1416. = G -=-3-1416. = | Multiply the product of the ( two diameters by -7854. . ( Half sum of the two diame- ' ( ters by 3-1416. Multiply two sides. ( Multiply a side by its width'' ] on the square. Multiply I sum of the two perpendiculars by the dia- gonal on which they fall ; or Fig. 24. Fig. 25. Area of trapezoid, Divide into two triangles in the most convenient manner, calculate the areas, and take the sum. Take £ the sum of the parallel sides and multi- ply by the distance be- tween them. Fig. 26. * The weight of a man in stones, divided by 4, gives tho rmW„ on weighing 12 stones occupies 3 cubic feet. ublc foet he occupies. Thus a man + The following table may be found convenient ;— Inches. Decimal parts of a foot. Inches. 12 « 1-00 11 - 0-92 10 ™ 0-83 9 - 075 8 - 0-fi7 7 = 0-58 6 5 4 3 2 1 Decimal parts of a foot. 0-50 0-42 0-33 0-25 0-17 0-08