BAIRD &.IWLOCK (LONDON) LTD. 



SAJRD St TAT LOCK. 



LONDON)L r 



1675 

 1675" Balance, Physical, to carry 2 1 kilos, sensitive to 50 milligrammes, pans 18 centimetres 



diameter, with plummet and levelling screws on mahogany sole . . 3120 



Al675 u Balance, as above, in polished case with counterpoised sliding front. . 



570 



1676 



1676 U Balance, Lumsden's pattern, with double beam, suitable for physical and chemical use 

 to carry 250 grammes, sensitive to i milligramme, fitted with agate knife edges and 

 bearings, hooks for specific gravity, plumb bob and levelling screws, on polished sole 



DESCRIPTION. 



This balance has been designed by Mr. Lumsden specially for students' work. No free weights smaller than 

 I gramme are required, the lower values down to milligramme are made in the shape of rings, and are permanently 

 kept over the beams. The right arm of beam has ten divisions, and decigrammes are found by i-gramme rider and 

 centigrammes by a decigramme rider. The riders when not in use, are supported on a hook screwed in brass block 

 on top of centre rod. In order to make weighings such as 0.22 or 0.55 gramme possible, a groove is made on the 

 larger rider so that the smaller one may rest on it. A light beam, one-fifth of the length of the main beam is used 

 for milligrammes ; it is divided on each side of the centre into ten parts, and a 5-centigramme ring rider' is used 

 This rests on the central division when not in use. 



Among other advantages claimed for this balance are the following : 



(1) A saving of time, no small weights being used on the pans. 



(2) Great accuracy, the total weight being read off directly, and there can be no error due to addin small 

 weights together. 



(3) No loss or damage to small weights. 



The balance will carry 250! grammes in each pan, and weigh to I milligramme. 



276 



CROSS STREET ; HATTCJN GARDEN, E- C 



