Popular Science Monthly 



263 



is convenient to have such an arrange- 

 ment to save her coming from upstairs 

 or from the basement laundry. 



A Handy Darkroom Lamp 



A LAMP that can be used for print- 

 ing and Hghting the developer tray 

 while the print is being developed can 

 be made by covering one side of a 

 wooden or metal box with orange or 

 ruby paper or glass and leaving the 

 other side open. The covered side 

 should cast its light on the developer 

 tray, while the open side can be used for 

 exposing the print. 



A 



When the tradesman shuts the door 



of this receptacle, it can be opened 



only from the inside of the house 



Door Parcels-Receivers 



EVERY housekeeper has times 

 when no member of the family 

 is at home when the day's supply of 

 milk or meat or groceries are de- 

 livered. Some dealers will not leave 

 parcels when there is no one to receive 

 them. The milk and the meat tempt 

 roving cats and dogs. In city homes, 

 at least, the chance of human thievery 

 has also to.be considered. It is now pos- 

 sible to have a special kitchen door fitted 

 with four box-like compartments, one 

 above the other. Each compartment is 

 independent and is for a definite kind of 

 supplies. Each has a door opening 

 outside and another inside the house. 

 The tradesman finds the outer door un- 

 locked and closes it upon his delivery, 

 after which the receptacle can bo 

 opened only from within the kitchen. 

 Even if the housekeeper be at home it 



A Rolling Clock 



N oddity in the way of a clock has 

 lately been invented by a young 

 jeweler in Los Angeles 

 who claims that it is more 

 accurate than the ordi- 

 nary timepiece. The clock 

 is placed upon the high 

 end of a small table 

 which is eighteen inches 

 long and of polished ma- 

 hogany. Gravity draws it 

 to the other end of the in- 

 cline, but the speed is con- 

 trolled by a wonderful 

 system of weights in the 

 clock. There are no 

 therefore no winding, 

 days the clock runs the 



springs and 



Every thirty 



eighteen inches and is then taken up and 



started all over again. The case re 



volyes as it runs down, but the dial re 



mains in the usual position. 



It takes this clock thirty days to roll the 

 length of the stand 



