a 4 3 
if; F. ~ 
copper wire‘ to the perforated disk, as shown pro . as 
Carrying a pot, a peat-block, or a cork into a moist ee re eee 
ported near its distal end by a simple Y-support adjusta - i ae 
In this position the instrument carries perfectly a 4- or 5-inc ee 
presumably a heavier one if well centered. Clamped upon a 
tal rod (fig. 3) it may 
also be used at any 
angle whatsoever, in- 
cluding complete in- 
version, the latter feat- 
ure being, I believe, 
Its special merits 
are its length of action 
(two days with one 
Winding), entire effi- 
ciency in any position, 
compactness (whereby 
it may readily be placed 
under bell-jars, etc.), 
and moderate cost. Its 
demerits are its ina- 
bility to carry plants 
Of over 4- or 5-inch 
pot (though it is ex- 
tremely rarely, and in 
educational demon- Fic. 3. 
Stration never, the case r speeds 
that heavier plants are used), its single speed pene se a 
ate extremely rarely, and in educational noe : brisk and cheery 
needed), and its audible tick, which however is of a 
character, quite in place in a laboratory. 
Il. PORTABLE CLAMP-STAND. | 8 
For many purposes in experimental pient pence ferent and 
clamp-stand, to support apparatus in special Sa Ac ted. For the 
One of the forms used in chemistry is generally adop 
i d of 
i screw rods instea 
*So in the figure, but the completed instrument is to have 
? 
the wire. 
