146
��Popular Science Monthly
��the material a difficult proposition. The shop cleaners deposit the metal in the box as it is gathered. To provide for easy- removal a door is placed on top of the box and also one in front, both being locked with a key. — ^J. R. M inter.
��White or light tinted paint required (i gal. covers about 350 sq. ft., 2 coats); divide 3,044 sq. ft. by 350 = 8| gal.
Darker colors (i gal. covers about 400 sq. ft., 2 coats); divide 3,044 sq. ft. by 400 = 7^ gal.
An average painter will brush on well about 150 sq. ft. of paint per hour, i coat. Divide 3,044 sq. ft. by 150 = 20.29 hours; call it 20^ hours for i coat, one man, and 40^ hours for 2 coats. Add 3 hours for mixing colors, setting and moving ladders, etc. Total 435 hours.
��Coloring Electric Globes for Decorative Lighting
TO color electric-light globes, make a coating as follows: Remove the gelatin from a quantity of discarded photographic films and dissolve them in equal parts of ether and alcohol; then color with aniline. This makes a coating that is impervious to water. Another method is to soak a small portion of gelatin in cold water until it has taken up all the water it can hold, pour off the surplus and add some boiling water — ^just enough to melt it — then strain it through several folds of cheesecloth. While still hot add a little aniline color, previ- ously mixed in a very little cold
water. Dip the globe in the warm , ,
solution and allow it to cool in a '^~^ -26'-—- — .^}Jlii^=^^^=^i^
vertical position to insure even Measurements for a house from which to obtain a base
coloring. This coating is not as ^°^ figuring cost of labor and materials for painting
good as the celluloid process first men- Material Cost:
tioned. — A. Ashmund Kelly. ioo lbs. white lead
bulk 2f gal., at $. . . .
Pure linseed oil .... 5 " "
Turpentine f " "
Japan drier I pt. "
���Estimating the Cost of Painting
��a Detached House
WHEN a house is to be painted the following plan will be found useful in determining the area to be painted and the cost of materials and labor:
Sides and ends 26-1-26-1-26+26 = 104 ft.
around the house. Height at corners, 16 ft., multiplied
by 104 1,664 sq. ft.
2 gables, 26 ft. wide multiplied by half
the height (6 ft.) 312
Dormer 2^X9 ft. = 22 sq. ft. 2 bay
window ends 3 X 8 ft. = 48 sq. ft. . . . 70 Side porch, rail and spindles (figure
solid)2|X4ft. = iosq. ft.; 2 sides. . 20 2 newel posts, 16 in. around; call it
1Ht.X5ft.high 15
Front porch floor, 8X23 ft. = 184 sq. ft.
Ceiling (figure solid) 8X23 ft. =
184 sq. ft 368
Front porch rails and spindles, (figure
solid) 2|X 16 ft 40
Front steps, risers and treads, 5 ft.
upX 5 ft. wide 25
4 porch columns, 4 ft. aroundX8 ft. high 128 Cornice facing and eaves overhang on
all sides 3Ht. X 1 15 ft. around = . . . 402
Total 3,044
��Color ,
��I lb.
��Amount of paint, 8^ gal. Total Cost..$.
Labor cost, 435 hours at cents per
hour
��Total I
Overhead expense, add % (15%?) of
material and labor cost
Profit, add % (20%?) of material and
labor cost
��Price to Charge Customer.
��Figure 3,044 sq. ft. at your regular price per sq. yd. or per square and see how your estimating method compares with the above.
��A Knitting Needle Used for Testing Milk
THE purity of milk is tested in Germany in a simple way. A polished knitting needle is held upright, dipped in the milk, and immediately withdrawn. If the milk is pure, some will adhere to the needle; but if water has been added, even in small
��proportions, the perfectly clean.
��needle will come out
�� �
