288 



Popular Science Monthly 



Sleigh Attachment for Perambulators Substitute for Large, Gas Reservoir 



'T^W'O runners are attached to a crank- 



handle, so that by moving the han- 

 dle they may be suspended above the lev- 

 el of the wheels or dropped below the 



This perambulator may be a sleigh in 

 winter or a carriage in summer 



level of the wheels. Thus the perambu- 

 lator may be used as a sleigh — or as a 

 wheeled vehicle, at the will of the op- 

 erator. 



Ice Skates Make Shoe Shining Stand 



DISCARDED ice skates of the type 

 which clamp the soles of the shoe 

 by the turn of a lever can be used for 

 foot rests on shoe shining stands. The 

 steel runner should be bolted between 

 blocks of wood that are nailed or 

 screwed to the foot rest base. With foot 

 rests of this sort, the nervous customer 

 cannot without difficulty, jerk his foot 

 from under the hand or brush of the 

 polisher. 



AN apparatus that will take the place 

 of the large and cumbersome 

 reservoirs used in chemical laboratories 

 for storing quantities of gas for experi- 

 ments can be made with two four-liter 

 bottles and several connecting tubes. 



Referring to the drawing, A and C in- 

 dicate the bottles. A mouth is cut in 

 the side of A and plugged with a rubber 

 cork bored out to accommodate a glass 

 tube. The tube leads from B into the 

 bottle C through a pinch cock inserted 

 at D. Gas is generated from an appara- 

 tus leading to tube E and is stored in 

 the lower bottle. When pinch cock D is 

 released the gas is forced out of C 

 through tube E until the supply is ex- 

 hausted. Water in the upper bottle 

 forces the gas from the lower bottle 

 through the tube E, 



With foot rests made from ice-skates, 

 the customer cannot escape 



This apparatus supplies gas for labora- 

 tory experiments 



Prevents Insulation Unwinding 



THE waxed cotton insulation of an- 

 nunciator wire can be prevented 

 from unwinding by unravelling a length 

 of both layers and knotting them. As 

 the layers are wrapped in opposite di- 

 rections the knot will prevent further 

 unravelling or slipping. 



Drilling Holes in Glass 



THE following mixture on the de- 

 sired size steel drill, will do a neat 

 smooth hole. 



Turpentine •. . , . 3 parts 



Machine oil 1 part 



Use on point of drill at high speed. 

 This formula is one used by optical 

 grinders. 



