This listing is for the item pictured. This is one of a series produced for:
 
DICTIONARY OF BRITISH SCIENTIFIC INSTRUMENTS.
Issued by the British Optical Instrument Manufacturers' Association. 1921

Page dimensions approximately
8 1/4 inches x 5 1/2 inches
(210mm x 140mm)

There will be another image/images of similar instruments on the reverse.
These may be mentioned in the title
 
****CONDITION****
PLEASE VIEW IMAGES TO SEE ANY HANDLING/AGE MARKS
/REPAIRS/DAMAGE/EXTENT OF MARGINS etc
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Please message with any questions regarding this item