لا توجد منتجات في سلة المشتريات.
عرض 1576–1590 من أصل 1963 نتيجة
Roots, Stems, Leaves
All Charts are made on PVC rexine, hand drawn, waterproof, in fast multicolours with a black background. Each chart is provided with rollers to hang on wall. Size 75×100 cm.
1) T.S. Dicot root
2) T.S. Monocot root
3) T.S. Dicot stem
4) T.S. Monocot stem
5) T.S. Dicot leaf
6) T.S. Monocot leaf
7) Root modification
8) Stem modification (Arial)
9) Leaf modification
10) T.S. dicot stem secondary growth
11) Vegetative propagation
12) Artificial propagation
13) Specialised stems
14) Typical leaf showing parts
15) Types of leaves
16) Simple leaves
17) Stipules
18) Leaf venation
19) Compound leaves
20) Phyllotaxy
21) T.S. Dicot root
22) Leaf Lamina secondry growthSKU: B13126Rotary Microtome
A sectioning equipment, economical and simple, yet providing all facilities of a standard rotary microtome. The internal mechanism is fully enclosed in a sturdy metal case, for protection against dust and grit & is driven by a handle which can be locked in position. A ball & socket type movement permits use of the entire knife edge. With a feed range of 1 to 25 microns in steps of 1 micron. Supplied complete with a set of three object holders, one razor 120 mm with back and handle, one honing plate, one bottle of oil for lubrication, dust cover and wooden cabinet.
SKU: B10565Rotating Disc Auxanometer
To measure plant growth rate. The recording arm 600 mm with a bristle tip at one end is mounted on an adjustable pillar enabling alteration of height and pressure of the bristle on a disc of 200 mm dia. The other end of the arm has three eyes to give x3, x4, x5 magnifications. A smoked disc is mounted on a circular plate which is clamped to a motor spindle, & has a central pin to prevent the lever passing the centre. The disc rotates at a speed of one revolution per hour.
SKU: B13408Rotating Drum Auxanometer
Records growth of a plant as a series of horizontal traces, the gap between which represents one hours 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 xheight. With paper strips, pencil, motor for drum,working on 220 / 240 V AC.
SKU: B13410Rotational Motion Apparatus
Explore the relationship between linear (tangential) and angular velocity with this setup. A DC-driven motor produces various rotational velocity at various distances from the motor. Different radii are drawn on the disk and pegs can be positioned at specific radii. A photogate may be attached as well, so the time of one rotation is easily measured. Students will then make measurements to calculate the angular velocity, which will be constant for a given motor speed independent of position. However, the tangential velocity will vary based on the radius of the circular path. Kit includes a rotational table, ruler and calipers. Required but not included are a 6 V power supply and a photogate system.
SKU: PH10428Ruhmkorff Coil
Ruhmkorff Coil produces pulses of high voltage spark from low voltage DC source (6 – 12 V DC). It is suitable for use with gas-filled discharge tubes, vacuum tubes, eudiometers and for general laboratory work. Includes an adjustable vibrator system, primary current polarity reversal, on-off switch, a capacitor enclosed in the box and special alloy contacts. Spark gap at the discharge points can be adjusted by sliding rods back and forth. Spark Length 15 mm.
SKU: PH50237
