48 



Equipment of the Students' Laboratory and Students' Work Room. 



No. 50283 



50 291. 1 : 20. 



50.293. Revolving Stool for Laboratory use, Figure 



The seat of polished alder is screwed on to a 42 cm Ions; threaded spindle; the latter passes 

 through a tube having a female thread, the tube being fixed to a three-legged iron support. The 

 seat can be raised as much as 70 cm. T 



50.294. - -The preceding, with rest, Figure 



50.295. - - do., with leather covered back 



Stink Cupboards. 



The framework of the stink cupboards is constructed either of pitch-pine or (at 

 proportional additional cost) of iron. 



The cupboards with wood framework are supplied either with the body of table 

 form or cupboard form. The body has rounded oak headings, which do not become 

 unsightly when knocked and which last well. As regards iron stink cupboards, we have 

 only listed those with table form body. 



The iron frame cupboards combine compactness with a small amount of space 

 required by reason of our using the smallest possible iron rails for the construction 

 thereof. The whole of the apparatus contained in the cupboard can easily be inspected 

 from any part of the work room; even complete or partial closing of the windows 

 does not detract from the view. For these reasons iron stink cupboards are peculiarly 

 adapted to chemistry class rooms. 



The upper part of all stink cupboards is glazed, it has one or more sliding windows in front hung 

 on gut strings, which can be retained in any desired position by iron counterpoises, and easily opened 

 and shut. The large sliding windows are each fitted with a small catched windows, in order that work 

 can be carried on in the cupboard without opening the whole window. The roof is sloping and is 

 glazed and has a lead gutter in front, in which the precipitated water collects, being carried away to a 

 lead receptable arranged laterally. The wood cupboard has an oak table top, into which an acid-proof 

 polished slate slab is inserted. 



The back of the cupboard is free; when ordering, therefore, the room wall must be cement 

 plastered or covered with glazed tiles. 



The noxious fumes lighter than the air are carried off through an opening in the wall under the 

 roof of the cupboard, flowing finally into the draught flue. For heavy gases there is a channel im- 

 mediately above the table top, which can be closed by a porcelain slab (see No. 50,315, Figure, 

 on p. 52). For obtaining good ventilation we recommend the employment as draught pipes of square- 

 section acid-proof clay pipes Nos. 50,316 50,318, which can be well and safely built into the walls. 



s. d- 

 0. 14. 







I 



For (Wall) Stink Cupboards see p. 29, No. 50,181. 



Cl. 5280. 



