Biology

To measure gas evolved or absorbed by living materials or tissue extracts. A respirometer bulb with a small water reservoir at the bottom and hollow ground glass stopper at top in the neck with a hole which can be closed or opened by turning the stopper, a graduated burette opening out of the bulb which connects to a leveling tube via a rubber tubing. Respirometer chamber 50 mm dia, burette 180 x 20 mm graduated 0 to 25 ml and 100 to 75 ml, with special clamp for fixing to a 12 mm dia rod.

Glass J-tube made out of thick-walled capillary tubing, with a brass screw & collar at end of longer limb. Used for sampling small quantities of gas in respiration or photosynthesis experiments.

Simple, Ganong’s.

An aluminium case with glass sides to observe root development at different depths, with aluminium shutters to exclude light so that roots will grow down the inside of glass. Bottom panel has holes for drainage, Overall size 380 x 70 x 270 mm.

Records growth of a plant as a series of horizontal traces, the gap between which represents one hour’s growth. The recording lever has 3 notches giving x5, x7 and x10 magnifications and is mounted on an adjustable pillar to adjust its height and pressure on the pencil tip. The recording drum has a pull-through vertical slot which enables the lever to take up the slack in its thread and then draw a new trace at a lower level, on base. Lever is 680 mm and drum is 300 x 150 mm, circumference x-height. With paper strips, pencil, motor for drum, working on 220 / 240 V AC.

To fit clinostat in place of cork disc, accommodates pots upto 75 mm dia, with three hooks near upper edge to secure pots.