120 



An Attachment Which Will Lock Your 

 Camera to the Tripod in an Instant 



AN ingenious camera 

 l\ attachment has been 

 invented by Clarence J. 

 Dawson, of Detroit, which 

 will instantly lock your 

 camera to its tripod, and 

 will just as quickly re- 

 lease it. It does away 

 with the inconvenience of 

 having to turn your cam- 

 era a dozen times about 

 the tripod stand in order 

 to screw it down tight. 

 With this attachment, the 

 camera can be locked down 

 by the mere pressing in of 

 a bar, when pointing in 

 any direction. 



One-half of the attach- 

 ment consists of a metal 

 casing which is screwed 

 permanently on the tripod 

 stand. A slotted locking 

 bar slides back and for- 

 ward just beneath the top 

 of this casing. The other 

 half of the attachment consists merely of a 

 metal disk through which a flat-head screw 

 projects to within one eighth of an inch 

 from its end. This half 

 is screwed into the 

 threaded aperture in 

 the bottom of the cam- 

 era. The camera is 

 immediately ready to 

 be locked to the tripod. 

 This is accomplished 

 by setting the camera 

 down so that the flat- 

 headed screw passes 

 through the hole in the 

 top of the metal casing, 

 and through the hole in 

 the locking bar, also. 

 The bar is pressed in- 

 ward. The wedge- 

 shaped slot in the bar 

 grips down upon the 

 head of the screw, fast- 

 ening down the camera 

 in the operation. 



Simple it surely is. 

 and it can be made 

 very cheaply. Auto- 

 matic pressing machines 

 could stamp the parts 

 from sheet steel. 



Popular Science Monthly 



Inclined surface 



A flat-head screw is passed 

 through the top of the casing 

 and the hole in the slotted bar 

 to the bottom of the camera 



Making the Acetylene Light as Brilliant 

 as the Electric Lamp 



THE accompanying 

 ' diagram shows the 

 detaiis of an ingenious de- 

 vice which makes the 

 acetylene light almost as 

 brilliant as that cast by 

 the electric lamp on auto- 

 mobiles and motorcycles. 

 The burner consists of a 

 round disk, or "button," 

 three-fourths of an inch in 

 diameter, set in a pressed 

 metal holder. It is made 

 of the same white sub- 

 stance of which ordinary 

 gas mantles are construct- 

 ed. A tiny bunsen burner 

 directs the flame against 

 this disk, which is thus 

 caused to give out a 

 bright incandescent light. 

 The burner is designed to 

 fit any standard headlight 

 from an acetylene tank. 



Two kinds of light may 

 be produced. If the white 

 disk and bunsen tube are pointed toward 

 the reflector, a brilliant white light is 

 thrown far ahead on the pathway. If the 

 burner is turned so that 

 the flame comes from 

 the front, a diffused 

 light is cast instead of 

 the powerful ray. This 

 is really equivalent to a 

 dimmer, since it is a 

 light which does not 

 dazzle. No wrench or 

 other tool is required 

 for turning the burner. 

 It can be easily accom- 

 plished with the fingers. 



FACE OF 

 BUTTON 



SPRING TO KEEP 

 BUTTON IN HOLDER 



Here the light is directed into the tree 

 top. At right is a diagram of the burner 



