Part 1 (2/2)

To make connections between the rods and outside wires, cut a shallow slot at the front side of each hole, so that you can put a narrow strip of tin or copper, B, in the hole by the side of each rod Setscrews, S, screwed in the side of A, will hold the rods in place, and at the saainst the a spring binding-post, D, or by fastening the wire direct to the strips, as shown in App 4

[Illustration: Fig 3]

Use the battery fluid given in App 15, and use a tumbler for the battery jar This cell will run small, well-made motors, induction coils, etc (See -- 3)

APPARATUS 4

_5 Carbon-Zinc Cell_ Fig 4 The general construction of this cell is the same as that of App 3 There are 2 carbons, C, each 4 1/2 in The holes for these are bored in A 1-1/4 in apart, center to center The zinc rod, Z, is a regular battery zinc, 6 3/8 in, and has a binding-post, Y, of its own The rods, C, are held in A, and connections are4]

The wire, X, is fastened direct to the strips, B, as shown When ready to use this cell, be sure that the wire connecting the carbons does not touch Z (Why?) The other wire is connected to Y The wooden piece is 4-1/2 1 1/2 in Use the battery fluid of App 15 in a tuood for induction coils, etc (See -- 3)

APPARATUS 5

[Illustration: Fig 5]

_6 Experi 5 Cut a strip each of copper, C, and zinc, Z (See list of materials) They should be about 2 in wide and 4 in

long Punch a hole through each, one side of the center, for screws, E

The wooden cross-piece, A, should be 4-1/2 1 7/8 in The battery-plates, or ele care that the screws, E, do not touch each other If the holes are ed so from the cellbinding-posts (App 42) can be slipped on the top of the plates

The solution to be used will depend upon what the cell is to do For simple experiments use the dilute acid (App 14) If for siven in App 15 The zinc should be well aamated

(App 20)

APPARATUS 6

[Illustration: Fig 6]

_7 Experi 6 In soe plates and cells with small ones This form will be convenient to use where narrow plates are desired Those shown are 4 1/2 in They are screwed to the cross-piece, which is 4-1/2 1 7/8 in Do not let the screws touch each other The wires are fastened under the screw-heads

APPARATUS 7

[Illustration: Fig 7]

_8 Experi 7 This cell has a zinc strip, Z, and copper cylinder, C, for the ”elements” The porous cup, P C, is fully described in App 11 Z is 5 1 in, and should be well aa 4, may be used instead of the strip The copper cylinder, C, nearly surrounds P C, and is made from a piece of thin sheet-copper, 6 2 in The narrow strip, or leader, A, is 5 1/2 in

To fasten it to C, punch two sths of stout copper wire through the holes, and hammer the centrally in the tu-posts (App 42) The battery wires can be fastened directly to Z and A, as suggested in Fig

4