626 



Popular Science Monthly 



A 



More Light on the Occupant of the 

 Dentist's Chair 



N ADJUSTABLE lamp for dentists' 

 use will doubtless be appreciated 

 by the profession. In the one described 

 the base, which is i8 inches in diameter, 

 is turned from wood (o match tlie ofifice 

 furniture. If not convenient to turn it, 

 it can be made of two crossed arms, 

 making a base with four feet. A half- 

 inch pipe, 5 ft. lo inches long, is fastened 

 to the base by passing it through a hole 



A dentist's light adjustable at any angle 

 which furnishes light from two directions 



in the center. A long screw, lock-nut 

 and bottom nut and washer make it 

 secure. 



Two blocks are drilled so as to slide on 

 this pipe, and thumb screws are topped 

 to bear on the pipe. This permits ad- 

 justment at any height. Each block is 

 drilled at right angles for the }4.-'m- 

 pipe arms, and is also furnished with 

 a thumb screw. This makes movement 

 in any direction possible. The arms 

 arc 30 in. long, and bent to an angle 

 of 30 (leg. al)out 4 in. from the end, 

 which is threaded for an ordinary 16 CP. 

 lam[) socket. The ojicnings through 

 base and the ends of tlu' jjipes ar«- litteil 

 with fibre bushings. The apparatus is 

 wired as shown and fitted with screw 

 I)lug for wall outlcl. 



This lamp, [iropcrh' adiu>t((l, will 

 fiirnis!) light at any angle and from two 

 «lircctions at once, the advantage of 

 which is apparent. — H. S. Rue ki:k. 



A Tool for Fishing Wires Through 

 Small Openings 



lR1)1.\.'\RY cork screws or screws 

 made from a steel rod in a similar 

 shape will make a very handy tool for 



O' 



-:i^^^^V;^%;^ 



A tool with screw for pulling wires through 

 small holes in insulation or walls 



the electrician in pulling wires through 

 small holes in insulation, walls, etc. In 

 making a special tool, twist one end in 

 cork-screw fashion so that its center will 

 fit over the regulation size. No. 14 gage, 

 rubber-covered wire. 



The screw-end is inserted in the hole 

 and turned around to make it take hold 

 of the wire. The wire-end can be easily 

 drawn through the opening. Holding 

 the tool in a slanting position makes it 

 take hold of the object to be removed 

 quickK'. The length of the tool will 

 depend on the user and the kind of work. 



Magnet-Power of Toy Automobiles for 

 Window Display 



WH1\\' plug P is inserted it furnishes 

 current for the motor, which in 

 turn rexolves the shaft and also the 



Racing auto- 

 mobiles for 

 window 

 display 



magnets. The same current energizes 

 the magnets. The little automobiles 

 are made of soft iron and when the shaft 

 revolves, taking the magnets with it, the 

 cars follow in the magnetic field. Clears 

 of any size can be .ippiied so the magnets 

 can revoKc at ditTcrenl speeds, and even 

 in opposite directions. — 11. H. PlCAKSDN. 



