934 



Popular Science Monthly 



A Dark-Room Lamp to Be Used 

 Under a Glass Tray 



THE lump illuslrated is a very handy 

 instrument for developing plates 

 and films. It consists of a light-tight 

 wood box A containing a small lamp B 

 and a reHector C. The size of the ruby 

 -6' 



A and should be glued to that board. 

 With reasonable care the batteries will 

 last at least a \ear and the amateur 

 photographer will find that the negatives 

 are far better developed in this manner. 

 Roll films can be developed in the same 

 manner as plates by attaching them to a 

 glass plate of the same size as the film, 

 using rubber bands to hold it closely to 

 the plate surface. — V. A. Oi.drovd. 



The developing tray of glass is placed 

 on top of the ruby glass of the lamp 



glass D depends upon the size of the 

 plates used. There are two dry bat- 

 teries E, about 6 in. long by 2 in. in 

 diameter which supply the current for 

 the lamp. The circuit is opened or 

 closed by the switch F. Two wood 

 blocks H keep the batteries E in their 

 proper place and support the reflector C. 

 The developing dish must be of glass and 

 is placed on the ruby glass D. The dry 

 plate or film is then put in the dish, the 

 developer poured on and after about 

 half a minute the lamp B ' 

 on for a few seconds. Without 1 

 the plate out of the dish one 

 judge the development as the li 

 is thrown through the ruby gh 

 D, and through the bottom of th 

 developing dish and the nega- 

 tive. This is repeated until 

 development is complete 



Since the dark- 

 room lamp described 

 here is the only 

 source of light in the 

 dark-room, and is 

 used only at inter- 

 vals for a few 

 seconds, there is no 

 po.ssibility of ft)g. 



The dimensions 

 given refer to a lamp 

 for plates 4 by 5 in. The reflector C 

 may be Ck-rman silver aiifl about 

 1/32 in. thick and fasteiuij In tin- wcickI 

 blocks H. The dr\- cells are connected 

 in series. Tlie niiiy glass I) fits in a 

 recess in tln' top nf liie board of the box 



A Sanitary Honie-Made 

 Tooth-Brush Holder 



PROCURE a 

 small bottle 

 and fasten to its 

 lower part a wire 

 hook with an elec- 

 tric or rubber 

 band. The hook 

 is used for hang- 

 ing the bottle to 

 the wall in a con- 

 venient place. 

 The tooth-brush 

 is forced through 



The toothbrush is 

 forced through the 

 neck of the bottle 



the neck, which holds it until needed for 

 use. The bottle is hung in an inverted 

 position. — J.4MES E. Noble. 



'' A Fountain Attachment for 



Ordinary Pens 



fIG 2 



AN ordinary pen 

 . can be made 



The coil of wire makes 

 fountain for an ordinary 



into a fountain pen 

 quite easily by at- 

 taching a small foun- 

 tain made of wire. 



To make this 

 fountain wrap a 

 piece of fine iron wire 

 around the point of a 

 sharp pencil as shown in 

 Fig. 1 , leaving about J4 in. 

 straight. To fasten it to 

 the pen, wraji the straight 

 wire around the pen- 

 shank. The coil part is 

 fitted into the inulerside 

 or IkiHow i)arl of the pen 

 with the pointed end down, as in Fig. 2. 

 The coiled jiart forms a pocket fpr 

 linlding the ink which is fed to the pen 

 betwt'en the coils. The dipping of the 

 pen in the ink fills the coil. This foinitain 

 will hold .1 good i|ii.mlil\- of ink. 



the 

 pen 



