Making Enlargements

TM 11-405-10

(4) Fix the prints in accordance with the

27. Making Enlargements

manufacturer's

instructions

for

the

a. Starting Procedures.

materials being used.

(1) Connect the enlarger to the source of

(5) Use the siphon on the tray and wash the

power (par. 14).

prints thoroughly in fresh, running water.

(2) Load the appropriate negative carrier (par.

(6) Turn the room lights on and the safelight

18), and insert the negative carrier into the

off.

(7) If glossy prints are to be

enlarger body (par. 19).

ferrotyped, soak the prints in ferrotype

(3) Load the easel (par. 20) with a sheet of

solution. Place the prints, emulsion side

plain white paper.

down, on clean ferrotype plates, and use

(4) Focus (par. 21) the projected image on

the squeegees to attain perfect contact

the plain white paper.

between the prints and the ferrotype

(5) Determine the correct exposure time (TM

plates.

11-401). If an interval timer is being used,

(8) Dry and trim the prints.

set it to the desired exposure time (par.

(9) Place the dried prints under a weight on a

23).

clean, smooth surface to prevent curling.

(6) Remove the plain white paper from the

c. Stopping Procedures.

easel.

(1) Turn the enlarger ON-OFF switch (fig. 3,

(7) Turn the room lights off and turn on the

11, or 12) to the OFF position.

safelight.

(2) Remove the negative carrier from the

b. Print Processing Procedures.

enlarger body.

(1) Make the required number of prints.

(3) Remove the negative from the negative

(2) Develop the exposed photographic

carrier. Place the negative in its preserver

enlarging paper for the appropriate length

(protective envelope).

of time (TM 11-401).

(4) Disconnect the enlarger from the source of

(3) Rinse the prints in shortstop solution.

power.

Note. Exhausted shortstop solution is a

(5) Replace the lens cap on the projection

frequent source of trouble. Prepare fresh

lens and cover the enlarger with an

shortstop solution when the acid becomes

appropriate dust cover.

neutralized.

Section IV.

OPERATION UNDER UNSUAL CONDITIONS

Condensation on the equipment may cause permanent

28. Unusual Conditions

damage. Whenever possible, inclose the equipment in

Processing Equipment PH-406 and Photographic Film

water-repellent material, while the equipment is in the

Processing Unit ES-20 (1) are designed to be used

cold atmosphere, and then transfer it to the warmer

indoors in a darkroom shelter. However, when the

room. The water-repellent material must inclose the

equipment has been stored outdoors or in shelters where

equipment as airtight as possible. Keep this covering on

extreme temperatures or climatic conditions are

until the equipment has reached room temperature. This

encountered, the special procedures outlined in

procedure will further eliminate the possibility of

paragraphs 29 and 30 should be followed before the

condensation on the equipment.

equipment is placed in operation.

c. Before operating the equipment (pars. 23 thru

29. Operation in Arctic Climates

para 27) clean and dry any water that has

a. Transfer the equipment from the cold to the

condensed on the moving parts. Use a clean,

warmer temperature and allow it to remain at room

lint-free cloth for this operation. Clean the projection lens

temperature for approximately 6 hours before removal

from the carrying cases.

b. Do not open the carrying cases before the

equipment

has

reached

room

temperature.

AGO 6894A