BAIBD &TATLOCK (LONDON) LTD. 



1707 



1708 



1707 V Bunge's Physical and Analytical Balance, No. li.with arrangement for mechanically 

 placing and removing the weights while the case is closed. Price, mounted on black 

 plate-glass sole, and polished mahogany case 



The considerable advantages afforded by this balance to experimenters determining weights, and more 

 especially to the busy analyst, are not shared by any other system of balances, and are as follows : 



The weights are deposited exactly in the centre, and are thus entirely uninfluenced by friction, concussion, or 

 fall. This is effected by purely mechanical means : in the first place, by removing a rod marked with the equivalent 

 of weight, to the left, until contact ensues ; secondly, turning the crank from the position, indicated by a spring 

 catch, to a position to be determined by contact ; and thirdly, moving back the rod, until contact is established, 

 to the right. In order to move the weights, the process is reversed. 



With some practice, a determination of weight within one centigramme can be carried out, with the aid of 

 this arrangement, within one-third of the time required if the weights have to be manipulated with the forceps 



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1708 Balance, Kuhlmann's Short Beam, in glass case, with counterpoised sliding door in front, 

 sliding door at back, and two side doors, black polished glass base plate, agate knife 

 edges and planes, 13 centimetre beam, capacity 200 grammes, sensitive to ^ milligramme. 

 Sensibility constant with all weights. Apparatus for arrest of beam and pans, improved 

 rider movement, magnifying arrangement for pointer. The scale of 20 divisions is on 

 the back of the ivory plate, and is reflected by means of a concave mirror to the eye ef 

 the operator. Weights less than the decigramme are not used for the pans. Fractions 

 of the milligramme are shown by the pointer 



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