1893.] MICROSCOPICAL JOURNAL. 161 



Cameras. — The aim has been to get the lightest and most com- 

 pact form possible, consistent with strength sufticient to withstand 

 travelling and climatic variations. This is realized in the highest 

 degree in their Acme camera, which they are making in the 

 An-ierican sizes. By the adaptation of aluminium for the fittings 

 in substitution for brass, weight has been further greatly reduced. 

 Aluminium has been considerably improved of late years by 

 alloving with other metals, and it is now thoroughly reliable and 

 will" stand hard usage ; its weight-saving advantages can be easily 

 appreciated. They are also showing a hand camera, called the 

 Vanneck, which has the great advantage over any other of en- 

 abling the user to sec the subject photographed during the whole 

 time of exposure, bv means of an extra focusing screen, let in 

 from the top of the camera. It is exceedingly compact andean 

 be used either w^ith the ordinary dry plates or roller films ; the 

 neatness of its get up, also, is so unobtrusive that it is not likely to 

 attract attention as some more palpable hand cameras very often 

 do. Their photographic lenses are made in every size and of 

 every type specially for portraiture, landscape, architecture, in- 

 stantaneous work, etc. These also are shown both in aluminium 

 and in brass. It may not be generally known that within a very 

 recent period it has been possible to have photographic lenses 

 certified as to their qualities at Kew Observatory. Watches, 

 thermometers, etc., have long been examined there, and it will 

 be a great satisfaction to purchasers of photographic lenses to be 

 absolutely sure from an independent verification like this that 

 their lenses are faultless. Should anyone desire to have them 

 verified, Watson & Sons supply certified lenses to their customers 

 and will exhibit certificated lenses at the Exhibition. 



Microscopes. — These instruments are used for a variety of 

 purposes consequently there is a variety of models. For pho- 

 tography they are exhibiting their Van Heurck microscope, which 

 is of exceedingly complete design and rigid construction. For 

 student's use their Edinburgh Student's microscope, which has 

 been supplied to universities and medical colleges throughout the 

 world, can be taken as a good example ; also special instruments 

 for amateurs who take up the microscope for recreative reasons, 

 petrological microscopes for mining engineers, etc., etc. In 

 these, also, aluminium plays a part wherever practicable. 



Transit theodolites and levels of the latest and most approved 

 construction, combining every possible convenience for surveying 

 purposes ; also stereopticons. both singles and biennials, of the 

 most recent designs are exhibited. 



We may mention that this firm has already been awarded 32 

 gold and other medals at different Exhibitions of the world, in- 

 cluding Paris Exhibition, 1889, two gold medals ; Kimberly Ex- 

 hibition, South Africa, 1S92 ; Melbourne Centennial Exhibition, 

 1SS8; also at Exhibitions in London, Glasgow, Antwerp, Ade- 

 laide, Calcutta, Amsterdam, etc., and 9 times they have been 

 placed alone at Exhibitions, receiving a higher award than any 

 other exhibitors showing similar goods. 



