LOW-POWER WOEK 



31 



towards the condenser), and after that through the lens, which should be of about 

 6-inch focus, or more will not matter. There is no lens in our experience, after 

 absolutely trying several kinds, save one of the new anastigmatic series, equal to an 

 old-fashioned triplet by Ross or Dallmeyer, which can often be purchased second 

 hand for a few shillings. If it can be had with rack and pinion it is all the better. 



The photographer now pins on the wall a piece of plain white paper and projects 

 the rays on to it. If his dark room is not large enough for this purpose, he must 

 convert a sitting-room into one, but this necessitates his waiting until night-time, 

 and also requires him to possess some powerful form of dark-room lamp. If such be 

 not at hand he can arrange an excellent " make-shift " in the following manner : 

 Obtain an old champagne box and fit over the front a piece of red glazed calico, 

 sold at any photographic dealer's ; also purchase a gas-burner with tap, having 

 attached to it a piece of rubber-pipe tubing of sufficient length to fit on to the gas- 

 pipe of the apartment. A little hole in the back or bottom of the box (covered with 

 a loose-fitting piece of red calico) is now to be made, through which the gas can be 

 ignited with a taper. He must also purchase two iron elbows about i|- inch 



diameter, and having fitted one into the other thus j — ' fix one end by means of 



a common socket to the side of the box, that side tvhich luhen the box stands on end 

 ivill become the top. These allow the fumes to escape, the gas bracket being fixed to 

 the opposite side, that side ivhich is to be the bottom of the lamp. Night having 

 come, he focusses the specimen carefully on the piece of paper pinned to the wall, which 

 is then removed, having carefully marked its exact position on the wall. The bromide 

 paper, upon which the enlargement is to be made, is then taken out of its packet, 

 the light of the lantern being turned nearly out p7'0 tern., whilst the extemporised 

 " ruby " lamp is turned up. A piece of deep yellow glass is then fixed over the lens or 

 held there by an assistant whilst the photographer turns up the limelight to see if 

 the position is quite correct. Yellow glass will be quite enough to prevent the lime- 

 light from acting on the paper, and red we have usually found too dense. The focus 

 had better not be touched, even though it appears to require it, for the yellow glass 

 often seems to spoil the sharpness of the image on the screen. He now removes the 

 coloured glass and exposes, if with Ilford Rough Rapid Paper for about three minutes 

 at F/ 1 6 and mixed jet at full work.* Development by ferrous oxalate is the cheapest, 

 but some prefer amidol. Hydrokinone may also be used, but the matter will be referred 

 to again later when development as a whole is treated. 



* Of course this will vary in accordance with the amount of magnification and the density of the negative. 



