GWR 5ft & 4ft DISTANT SIGNAL ARMS.

Both signal arm images have been drawn, front views only.

There are two pairs of images, for each length of signal arm, one pair is at true scale of 4mm to 1 foot,
the second pair has been saved at an over scale of 36 pixels per foot (or very near too).

Below are the data files for all four signal images.

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gwr_5ft_distant_signal_arm_front_view_true_scale

Files saved at dpi =  112 x 112 pixels/in

File sizes  =  110 x 35  pixels

Over all longest dimension 6ft 1.54in (110 pixels) is measured horizontally, and the measurement is taken, left to right, across the length from the left-hand top tip edge point of the signal arm chevron end to the outermost curved edge of the lens area on the right.

The measurement you should get is:

 Scale = 24.5133 mm

 Proto = 6ft 1.54in  (6.128325ft)

The ‘Sketchboard’ scaling factor becomes:

110 /6.128325  (110 / 6ft 1.54in) = 17.9494, rounding  = pf1795

 Image height scale = 7.6 mm

 Proto = 1ft 10.8in  (1.9ft)

File Name:

gwr_5ft_distant_signal_arm_front_view_true_scale_6ft_1p54in_x_1ft_10p8in_v1_a1a_brian_nicholls_z2z_pf1795

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gwr_5ft_distant_signal_arm_front_view_over_scale

Files saved at dpi =  226 x 226 pixels/in

File sizes  =  220 x 69  pixels

Over all longest dimension 6ft 1.54in (220 pixels) is measured horizontally, and the measurement is taken, left to right, across the length from the left-hand top tip edge point of the signal arm chevron end to the outermost curved edge of the lens area on the right.

The measurement you should get is:

 Scale = 24.5133 mm

 Proto = 6ft 1.54in  (6.128325ft)

The ‘Sketchboard’ scaling factor becomes:

220 /6.128325  (220 / 6ft 1.54in) = 35.898879, rounding  = pf3590

 Image height scale = 7.6 mm

 Proto = 1ft 10.8in  (1.9ft)

File Name:

gwr_5ft_distant_signal_arm_front_view_over_scale_6ft_1p54in_x_1ft_10p8in_v1_a1a_brian_nicholls_z2z_pf3590

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gwr_4ft_distant_signal_arm_front_view_true_scale

Files saved at dpi =  112 x 112 pixels/in

File sizes  =  99 x 35  pixels

Over all longest dimension 5ft 6.15in (99 pixels) is measured horizontally, and the measurement is taken, left to right, across the length from the left-hand top tip edge point of the signal arm chevron end to the outermost curved edge of the lens area on the right.

The measurement you should get is:

 Scale = 22.05 mm

 Proto = 5ft 6.15in  (5.5125ft)

The ‘Sketchboard’ scaling factor becomes:

99 /5.5125  (99 / 5ft 6.15in) = 17.9591, rounding  = pf1796

 Image height scale = 7.6 mm

 Proto = 1ft 10.8in  (1.9ft)

File Name:

gwr_4ft_distant_signal_arm_front_view_true_scale_5ft_6p15in_x_1ft_10p8in_v1_a1a_brian_nicholls_z2z_pf1796

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gwr_4ft_distant_signal_arm_front_view_over_scale

Files saved at dpi =  225 x 225 pixels/in

File sizes  =  198 x 69  pixels

Over all longest dimension 5ft 6.15in (198 pixels) is measured horizontally, and the measurement is taken, left to right, across the length from the left-hand top tip edge point of the signal arm chevron end to the outermost curved edge of the lens area on the right.

The measurement you should get is:

 Scale = 22.05 mm

 Proto = 5ft 6.15in  (5.5125ft)

The ‘Sketchboard’ scaling factor becomes:

198 /5.5125  (198 /5ft 6.15in) = 35.918367, rounding  = pf3592

 Image height scale = 7.6 mm

 Proto = 1ft 10.8in  (1.9ft)

File Name:

gwr_4ft_distant_signal_arm_front_view_over_scale_5ft_6p15in_x_1ft_10p8in_v1_a1a_brian_nicholls_z2z_pf3592

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