430 BOTANICAL GAZETTE [DECEMBER 
reduce the speed from the smaller worm gear by interposing one of 
the step pulleys between the worm gear and the first klinostat. By 
the interposition of one such pulley, the speed of the first klinostat can 
be reduced to one revolution per minute, which is slow enough for 
objects less than one meter from the center of revolution. If desired, 
speed may be still farther reduced by other pulleys between the worm 
gear and the klinostat. 
The shajts (fig. 3, d).—The shafts are of half-inch cold rolled 
steel, and are cut to any length. 
The shajt supports (fig. 3, c)—These supports have a total 
minimum height of 12.5°™, and by raising the upper part of the 
support may be extended to a height of 15.5°™. This adjustment of 
the height of the support allows the shaft to be leveled up when the 
table or other object to which the supports are fastened is not level. 
The lower part of the support is a socket in which the stem of the _ 
upper part is held by a set-screw. The brass co]lar at the upper end 
of the support acts as a bearing, as shown in fig. 1, and automatically 
tilts up and down to conform to the direction of the shaft which passes 
through it. The middle piece of the support (fig. 3, ¢) has the shape 
of a tuning-fork, the stem of which is held in the socket below, and 
between the forks of which is received a plate projecting from the 
lower side of the collar above. An iron pin passing through the arms 
of the fork and the plate of the collar suspends and hinges the collar, 
and thus allows the automatic tilting. The three movements allowed 
the upper part of the support—that of vertical movement in the socket, 
rotation in the socket, and tilting of the collar—give ready adjustment 
to all possible faults of mounting of the shafts, prevent all binding, 
and have much to do with the easy running of the machines. 
The pulleys (fig. 3, d)—The pulleys for the horizontal mae 
are of cast iron, and made with three steps of 4, 8-5; and ee 
diameter respectively. Each step has a peripheral thickness of 1 
and has turned in it a V-shaped groove to take a quarter-inch leather 
belt. The pulleys are fastened to the shafts by set-screws. 
Special turn-tables (fig. 2, a and b; fig. 3, 6).—The * : 
apparatus is sufficient for centrifuges and klinostats revolving wi 
horizontal axis. For revolution about a vertical axis the geen 
shown in the figures referred to have been made. They have an ire 
foregoing 
