BAIRD &TATLOCK (LO^fDON) LTD. 



4835 



4835 1 Simmancc-Abady Lamp Spinner, spinning lamps at any angle . . . . . . 20 



4836 1 Simmance & Abady's Lamp Spinner, spinning lamps horizontally . . . . . . 16 



4837 T Lamp Holder to take incandescent glow lamp with shade up to 10 in. diameter for testing 



at any radial or axial angle . . . . . . . . . . . . ..600 



We illustrate and describe, as examples of photometer equipments, Nos. 4838-4843. It will 

 be obvious that by varying the photometer head or standard of light and lamp holder, different 

 combinations can be obtained. 



4838 



4838 T Simple Photometer. 



The one illustrated above is shown with pillai for taking electric incandescent lamp, the standard of light 

 being Simmance's i-candle Pentane Standard. The bar is graduated for direct reading in candle-power, the 

 lights being 60 in. or 1500 millimetres apart. The comparisons are made by means of a Bunsen or Leeson disc 

 mounted in polished mahogany box on saddle or carrier, with rollers. 



The price of the photometer complete, as illustrated is 

 4839 T Photometer, as above, for lights 100 in. apart 

 4840 T Ditto, enclosed for use in light room 



12 10 

 15 

 20 



881 



