Popular Science Monthly 



451 



HANDLE 



Developing a Long Photographic 

 Film in One Piece 



THE device illustrated is useful in 

 developing kodak films. A long film 

 may be developed and at the same time a 

 sufficient portion of it can 

 be watched during de- 

 velopment. Mount a film- 

 holder of special shape on 

 a base having suitable 

 legs, together with a cen- 

 tral rod and handle. 

 Unwind a roll of film 

 and remove the 

 paper backing. 

 Wind the film 

 around the upper 

 part of the spiral 

 holder, one end 

 being secured by 

 a small clip. Thus 

 disposed the film 

 is pushed down 

 flush with the 

 top edge and secured, if need be, by other 

 clips. After the developing the film can 

 be readily lifted out and treated in other 

 baths. 



The long'film is developed 

 in the spirals of the holder 



A Perfect Five-Pointed Star 

 Drawn with a Compass 



WITH a compass draw a circle. Divide 

 its peripher>- into 5 equal parts, 

 stepping it off with a divider, and number 

 the division points from i to 5. Draw a 

 straight line from aivision point I to 3, 

 from 2 to 4, 3 to 5, 4 to I and from 5 to 2. 

 The result is a perfect star, the size of the 

 star depending on the size of the circle. 



The Amount and Distribution of 

 Water on a Farm 



AFTER a pure water supply for the 

 L farm is made available, the things to 

 be considered are the quantity of water 

 needed, choice of pumping equipment, and 

 means of storage and distribution. The 

 quantity required depends on the power 

 used and whether the serv^ice is for the 

 entire farm or for the house only. Hand- 

 operated systems are applicable where 

 small quantities are required for house 

 service only; but in case water is wanted 

 for stock, also, the use of a windmill, engine, 

 electric motor or hydraulic ram is neces- 

 sary. If a windmill is used the storage 

 should be large enough for at least three 

 days' supply, to provide water in case of 

 calm weather Where the other sources of 



power are used the storage capacity need 

 not exceed one day's supply. The following 

 table gives approximate quantities of water 

 required per day: 



Each member of the family for 



all purposes 25 to 40 gallons 



Each cow will require 12 



Each horse will require 10 



Each hog will require 2^ '" 



Each sheep will require 2 



The water consumption will var>'^ from 

 day to day and with the seasons. Fire 

 protection should also be considered, and in 

 determining the size of tank the maximum 

 amount likely to be required should be 

 provided. 



For a family of 6 persons a 200-gal. sup- 

 ply should be sufficient if the water is used 

 for the house only. On a farm where water 

 is supplied to a family of 6 persons, 10 

 horses, 12 cows, 25 hogs and 15 sheep, the 

 daily storage supply should be at least 

 500 gal., exclusive of the amount provided 

 for fire protection. 



Removing a Heavy Truck-W^heel 

 Without a Chain-Block 



THE body of a motor truck usually 

 overhangs to such an extent that it is 

 impossible to use the chain-blocks for re- 

 moving a heavy wheel. The method 

 illustrated has been used with excellent 

 results, and it requires the ser\-ices of only 

 one man. The wheel is jacked high enough 

 to put a plate and rollers imder it. The 

 plate should be about 18 in. square and 

 ^ in. or more thick. The rollers are 



Plate with rollers beneath to make a movable 

 platform for removing a heavy truck- wheel 



made of i-in. pipe 18 in. long. The car is 

 lowered until the wheels rest on the plate 

 and it can be easily pulled out on the 

 rollers. — Lester Jones. 



