Drawing room kinks by unknow

Author:unknow
Language: eng
Format: epub
Tags: Drawing-room practice. [from old catalog]
Publisher: New York [etc.] Hill publishing company
Published: 1908-03-25T05:00:00+00:00

^

l'', %.

4

^

^

• I ?

I •

I I

'Mill

^

M

6

7 2

o

72

d

7

o

bfi

Ui

^

spaces ^ inch each, while the two inner spaces are ^f inch each.

In making the V notches in these steel pieces use a double bevel milling cutter, 45 degrees each side. Of course, Fig. 39 is a simple job of milling, but with the gages Figs. 40 and 41 you have to exercise your head a little to get the tops of the ribs all in the same plane. The ultimate spacing you are after is that between the tops of the ribs, while the cross-slide of the milling machine has to. be moved the distance between the bottoms of the grooves. However, the vertical and horizontal adjustments of the milling machine are easily arrived at by remembering that the depth of any 90-degree groove is equal to half its width, while the distance between the bottoms of two adjacent grooves is equal to half the sum of their respective widths.

Another handy device for use in making the style of letters shown in Fig. 39 is a letter templet for the straight parts of the letters that are neither vertical nor horizontal. The one we have is shown in Fig. 44 and reversed in Fig. 45. It is made of sheet aluminum, although this is far

from being an ideal material for that purpose. One objection to the celluloid that triangles are usually made of is that in this case the transparent feature might prove objectionable, as the templet is marked on both sides, and the marks on the side against the paper would show in a reversed direction. In the case of ^, M, F, TF, X and Y this objection would not hold good, but with the K^ Ny Q, R and 4 it might be confusing to have a transparent templet. The vertical hight of each slope should be somewhat more than the hight of the largest size of letters intended to be laid out with it. The angles on this templet are based on the supposition that all the letters calling for its use are 4 units wide (the hight being 5 units) with the exception of A, which is 4^ units wide, M 5 units wide, and Wf which is 5^ units wide. Any other proportion of width to hight would, of course, make different angles necessary.

A COMBINATION TRIANGLE

The sketch, Fig. 46, shows a combination triangle which has been used for some time,

A GOMBINATION TRIANGLE

69

and with the protractor added it is still more useful.

With the ordinary triangle one is constantly

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